Re: [RE-wrenches] SunPower Warranty and Monitoring

[Corey Shalanski via RE-wrenches]

Jason,

Perhaps you also saw this headline:
Maxeon to offer warranty support for bankrupt SunPower
<https://pv-magazine-usa.com/2024/08/30/maxeon-to-offer-warranty-support-for-bankrupt-sunpower/?utm_source=SolarWakeup&utm_campaign=9ede8c7a6b-SolarWakeup_2_182_16_2013_COPY_01&utm_medium=email&utm_term=0_5eaa0aab62-9ede8c7a6b-44304797&mc_cid=9ede8c7a6b&mc_eid=f811e4c728>

it doesn't address Enphase equipment separately/specifically - seemingly
only Maxeon modules (or ac modules with Enphase units attached).

Corey Shalanski
Jah Light Solar
Portland, Jamaica


On Thurs, Aug 15, 2024 at 5:09 PM  wrote:

>
> As another one bites the dust, does anyone have insight into who, if
> anyone, will take over the warranty for Sunpower branded Enphase
> microinverters and if the SunPower monitoring will continue to work? Or
> maybe they can be software updated to work on the Enlighten portal?
>
> And also, would a system be able to be upgraded using Enphase branded
> microinverters if the software was made to be compatible?
>
> I'm sure there are more questions than answers at this point, but I wanted
> to get the discussion going.
>
> Jason Szumlanski
> Florida Solar Design Group
>
___
List sponsored by Redwood Alliance

Pay optional member dues here: http://re-wrenches.org

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

There are two list archives for searching. When one doesn't work, try the other:
https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/
http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org

List rules & etiquette:
http://www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
http://www.members.re-wrenches.org

Re: [RE-wrenches] sealing a carport array

[Corey Shalanski via RE-wrenches]

Hi Kirk,

Way back in 2016, Bob Maynard made a recommendation
<https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/msg22436.html>
for a racking product called Solar RainFrame. It looks like the weblink in
that post is now broken, but I see an updated website at solarrainframe.com.

For larger arrays, you might consider a product from Nucor called
PowerShingle
<https://www.nucorbuildingsgroup.com/powershingle-solar-roof-panels/>. One
of my buddies recently installed that product on top of a parking garage,
and he seems satisfied enough with the results—i.e., he has not observed
any leaks after the first few months in service.

--
Corey Shalanski
Jah Light Solar
Portland, Jamaica


On Wed, Sep 13, 2023 at 10:08 AM Kirk Herander via RE-wrenches <
re-wrenches@lists.re-wrenches.org> wrote:
>
> All,
>
> Looking for recommendations to seal the gaps between modules in a carport
> array for weather-tightness. I've used the Sunmodo gaskets before, but
> curious about other reliable options. Thanks.
> --
>
> *Kirk Herander / **kirkh@vermont.solar *
>
> *Owner|Principal, VT Solar, LLC*
>
> *Celebrating our 32st Anniversary 1991-2023!!*
>
> dba Vermont Solar Engineering
>
> 802.863.1202
>
___
List sponsored by Redwood Alliance

Pay optional member dues here: http://re-wrenches.org

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

There are two list archives for searching. When one doesn't work, try the other:
https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/
http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org

List rules & etiquette:
http://www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
http://www.members.re-wrenches.org

[RE-wrenches] Attaching PV with VELCRO

[Corey Shalanski via RE-wrenches]

Wrenches,

As far out as the subject line might seem, a company in Italy has
apparently developed a system for attaching PV arrays to flat roofs using
strips of VELCRO
<https://www.generalmembrane.it/sites/default/files/Brochure-General%20FIX-ENG.pdf>
.

The potential advantages of this system seem hard to ignore:
   - lightweight
   - no ballast required (also, no mechanical attachments)
   - quick installation and easy assembly

Has anyone ever encountered anything similar here in the states? Any
opinions about the feasibility of this approach?

Corey Shalanski
Portland, Jamaica
___
List sponsored by Redwood Alliance

Pay optional member dues here: http://re-wrenches.org

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

There are two list archives for searching. When one doesn't work, try the other:
https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/
http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org

List rules & etiquette:
http://www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
http://www.members.re-wrenches.org

Re: [RE-wrenches] Onboard PV Charging Kit for Electric Vehicle

[Corey Shalanski via RE-wrenches]

For Jay and anyone else interested in how the module deployment mechanism
operates, please see this video (starting around the 2:50 mark):

1955 Ford F100 EV Conversion/test drive
https://youtu.be/-MrNITun0uM?t=170


Thanks for your interest,
Corey


On Wed, Oct 5, 2022 at 6:52 AM  wrote:

>
> Hi Cory
>
> What a beautiful truck. Would like to see the video of the solar extending
>
> My question, is it possible to go direct to the EV battery?
> he/she just wants to charge the ev right directly off the panels?
>
> And what voltage is the main battery.
>
> Jay
>
___
List sponsored by Redwood Alliance

Pay optional member dues here: http://re-wrenches.org

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

There are two list archives for searching. When one doesn't work, try the other:
https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/
http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org

List rules & etiquette:
http://www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
http://www.members.re-wrenches.org

Re: [RE-wrenches] Onboard PV Charging Kit for Electric Vehicle

[Corey Shalanski via RE-wrenches]

For those wondering about the battery pack, it was pulled from a Nissan
Leaf—nominal voltage is 360 Vdc. So I don't believe it will be possible to
charge the EV battery directly from the PV (or from the 'off-grid' battery
bank). It is understood that there will be some not-insignificant
efficiency losses involved in pumping the electrons between the PV and the
EV battery.

Just to clarify, the PV was added mainly to *demonstrate the concept* that
onboard charging (to a limited degree) is possible. The off-grid battery is
not meant to be the primary charging source. Once parked, the idea would be
to get as much juice out of that battery as possible and then just plug in
to the nearest utility-fired receptacle for the remainder of the charge.

It has been awhile since I have specced any off-grid components - as in
before lithium-based batteries took center stage. So I am mainly seeking
recommendations on which equipment Wrenches would install "on their own
house" (or on their own PV-powered pickup truck!).

--
Corey


On Wed, Oct 5, 2022 at 2:00 AM  wrote:

>
> Wrenches,
>
> One of my friends converted his 1955 Ford F100 pickup truck into an
> electric vehicle. He also had a nifty (mechanized) racking assembly
> installed in the bed that can deploy a fold-out 3-module PV array at the
> push of a button. If you aren't yet salivating, please see the attached
> image.
>
> He would like to add an 'onboard off-grid' battery + inverter kit that
> would essentially allow the truck to *plug into itself* (or, more
> correctly, into the sun). My first question is if anyone has ever attempted
> anything like this? or knows of a similar project?
>
> I'm taking suggestions for your favorite off-grid kit components
> (make/model)—system specs as follows:
>
>- Inverter: preferably around 3–4 kW output rating, can be either 120
>or 120/240 Vac output since the EV charger is rated for both
>- Batteries: we're thinking LFP for the chemistry, around 3–4 kWh @
>80% DOD, bank voltage would depend on inverter model (or the other way
>around, if you prefer)
>- Charge Controller: wiring the modules in series would give 900 W /
>118 Voc / 10 A Isc
>- Battery SOC Meter: ideally can be mounted on dashboard
>
> Thanks in advance for any electrifying ideas the group can offer!
>
> --
> Corey Shalanski
> Jah Light Solar
> Portland, Jamaica
>
___
List sponsored by Redwood Alliance

Pay optional member dues here: http://re-wrenches.org

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

There are two list archives for searching. When one doesn't work, try the other:
https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/
http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org

List rules & etiquette:
http://www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
http://www.members.re-wrenches.org

Re: [RE-wrenches] Lead placment and length on new PV Panels

[Corey Shalanski via RE-wrenches]

William,

My team and I are constantly strategizing about the issue you have
described, pretty much on a project-by-project basis nowadays since our
module supplier's stock changes frequently. Each new module's lead cable
positioning and lengths must be examined for compatibility with the
specified MLPE device. Our process typically involves creating a CAD sketch
of the wire management details, aiming to follow the 2020 NEC securement
rules (within 12" of each junction box, spans not to exceed 24" elsewhere)
as closely as possible. We have come to the determination that certain
module lead cable configurations are simply not 'MLPE-friendly'; in
particular, modules with split junction boxes and short lead cable lengths
(≤ 250 mm) appear to be tailor made for non-roof-mounted arrays where rapid
shutdown devices are unnecessary. I wish I could say that we avoid using
those modules for rooftop arrays, but the truth is that we sometimes don't
have the option to pick-and-choose a certain project's spec module. There
are definitely times when the cables on the module and the cables on the
MLPE aren't quite long enough to connect to each other—for those times, as
Jay suggested, we will specify jumper cables to make up the difference.

We have found the design of the APsmart RSD-S-PLC
<https://apsmartglobal.com/wp-content/uploads/2021/11/4301615202_RSD-S-PLC-Datasheet_Rev2.3_2021-11-11-1.pdf>
to be one of the more flexible (and less visually obtrusive) options. With
the input/output cables extending to either side of the device (*along* the
module frame as opposed to *away from* it), they seem to be better suited
to the 'long-edge leaded modules' you describe on your web page.

--
Corey Shalanski
Jah Light Solar
Portland, Jamaica


On Fri, Mar 25, 2022 at 3:22 PM William Miller  wrote:

>
> Friends:
>
>
>
> I have been designing a large-ish off-grid system over the last few
> weeks.  This will be our first off-grid system to require MLRSS.  We chose
> the Tigo TS4-A-F system.
>
>
>
> In order to make certain the Tigo will work with modules that we can get
> our hands on, we brought in a few samples to try and connect with the
> Tigos.  What we found is that with many of the new PV panels, the leads
> connect to the two long sides of the panels and are often too short to
> practically route to the frame-mounted Tigos.
>
>
>
> This got me to thinking:  Many panels are now configured with leads
> connected to the two long sides.  Many new panels are coming out with
> shorter leads.  Virtually all new roof-mounted installation will need some
> form of MLPE.  These new panels will be ill-suited to connect to those MLPE
> devices.
>
>
>
> This has to do with the fact that instead of in the old days, when each
> panel connected to a neighbor on either side, each panel now connects to a
> single device, the MLPE.  The leads must able to reach that MLPE without
> being pulled, banjo-string-tight across a void.  If PV leads cannot be
> supported, they will end of laying on the roof.  Can we agree that is a bad
> thing?
>
>
>
> Have any of you consider this situation?  It is kind of complicated and
> hard to explain.  I attempted to do so by writing a web page dedicated to
> the subject.  I finished the site today but I am not sure it communicates
> the dilemma adequately.  You can find it here
> <https://millersolar.com/MillerSolar/case_studies/31-Module_leads/Module_leads.html>
> .
>
>
>
> I would be most grateful if some of you more experienced installers could
> look this over and let me know if this problem has come across your radar
> and what you are doing about this issue.
>
>
>
> Thanks in advance.
>
>
>
> William Miller
>
>
>
> Miller Solar
>
> 17395 Oak Road, Atascadero, CA 93422
>
> 805-438-5600
>
> www.millersolar.com
>
> CA Lic. 773985
>
___
List sponsored by Redwood Alliance

Pay optional member dues here: http://re-wrenches.org

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

There are two list archives for searching. When one doesn't work, try the other:
https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/
http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org

List rules & etiquette:
http://www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
http://www.members.re-wrenches.org

Re: [RE-wrenches] Over-torquing Module Clamps?

[Corey Shalanski]

Hi Will,

I'm not sure if this is what you were asking (I see that your message was
directed to Jerry), but we 'discovered' the over torquing by setting our
torque wrench on the spec value and confirming that the wrench 'clicked,'
and then progressively increased the setting higher and continued checking
until the wrench did not click and nudged the nut a bit.

--
Corey


On Tue, Sep 7, 2021 at 7:29 AM Will White  wrote:

> Jerry,
>
> I'm curious, how did they prove over torquing? When doing inspections it's
> easy to find connectors that are under torqued but I haven't heard of a
> reliable way to check for over torque.
>
> Thanks,
> Will
>
___
List sponsored by Redwood Alliance

Pay optional member dues here: http://re-wrenches.org

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

There are two list archives for searching. When one doesn't work, try the other:
https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/
http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org

List rules & etiquette:
http://www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
http://www.members.re-wrenches.org

Re: [RE-wrenches] Over-torquing Module Clamps?

[Corey Shalanski]

August,

Thanks for your feedback.The racking model is EcoFoot2+
 by Ecolibrium Solar (now part
of Unirac). These module clamps are also self-grounding with teeth to bite
into the module frame. I reached out to the manufacturer, who confirmed
that the clamp material is aluminum extrusion and the hardware is stainless
steel.

The modules were installed about 2 weeks ago, so not very much time has
elapsed to be able to observe potential resultant damage. We haven't seen
any problems so far.

--
Corey


On Fri, Sep 3, 2021 at 6:35 AM August Goers  wrote:

>
> Hi Corey -
>
> For many years we used Pro Solar racking and Unirac Solarmount and
> tightened the clamps with impact drivers. At some point maybe roughly 8
> years ago, Unirac switched its mid clamps to stainless steel self grounding
> clamps with teeth to bite into the module frame. We continued to use
> impacts with no issue. Then, starting around 4 years ago, we started to
> have module glass failures with our SunPower commercial systems and these
> Unirac clamps. We immediately switched to torque wrenches for tightening
> the clamps. However, the failures continued. My guess is that the poor
> design of the Unirac mid clamps in conjunction with thinner “weaker” module
> frames exasperated the issue. We now have stopped using those mid clamps
> and continue to hand tighten all clamps. We primarily install SunPower, and
> their residential module frames have a lip so all the pressure from the
> clamp doesn’t go to the glass.
>
> Getting to your question - what kind of mid clamps do you have? If they
> are aluminum, there may be less risk than the stainless clamps. I would be
> worried that the process of loosening and then re-tightening might cause
> more damage than good if there aren’t any problems that have occurred to
> date. It’s a good question.
>
> August
> Luminalt
>
___
List sponsored by Redwood Alliance

Pay optional member dues here: http://re-wrenches.org

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

There are two list archives for searching. When one doesn't work, try the other:
https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/
http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org

List rules & etiquette:
http://www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
http://www.members.re-wrenches.org

[RE-wrenches] Over-torquing Module Clamps?

[Corey Shalanski]

Wrenches,

(This question actually does refer to the proper use of 'wrenches'...)

While inspecting some recent work from one of our contractors, we noted
that the PV module clamps had been torqued to ~150% of the racking
manufacturer's specified value. My question is whether that might have any
detrimental effect on the modules (frame, glass, cells, seal, etc) and
whether it would be worth loosening the clamps and re-torquing them to the
proper spec? For reference, 224 modules are installed.

We were made aware that the contractor used an impact driver on the clamps,
which accounts for the excessive torque applied. I definitely understand
the temptation to use an impact driver for just about any hardware
that needs turning—but my understanding is also that impact drivers are
generally incompatible with machine screws. So my other question to the
group is whether anyone has had success in dissuading subcontractors from
using impact drivers so liberally on project sites? Any advice is
appreciated.

--
Corey Shalanski
Jah Light Solar
Portland, Jamaica
___
List sponsored by Redwood Alliance

Pay optional member dues here: http://re-wrenches.org

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

There are two list archives for searching. When one doesn't work, try the other:
https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/
http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org

List rules & etiquette:
http://www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
http://www.members.re-wrenches.org

Re: [RE-wrenches] Tigo Rapid Shutdown equipment

[Corey Shalanski]

Dave et al.,

Please note that SMA no longer offers the TS4-R-F devices—according to our
distributor, they ceased offering them toward the end of last year.

SMA maintains a list of compatible rapid shutdown receivers here
<https://files.sma.de/downloads/SunSpec-Kompatibilitaet-TI-en-12.pdf?_ga=2.194448045.104408375.1630023285-229768817.1630022978>.
You will see the JMS-F device listed, along with the APsmart device that
Jeremy recently wrote about
<https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/msg29719.html>.
The TS4-R-F device is also listed, but, again, I believe it is no longer
being manufactured/distributed.

--
Corey Shalanski
Jah Light Solar
Portland, Jamaica


On Wed, Aug 25, 2021 at 9:02 AM Dave Tedeyan  wrote:

> Hi Chris,
> I also am curious of others experiences. I've got one system with SMA and
> the TS4-R-F. No problems, but it's only 6 months old. I hear that SMA now
> recommends the ones made by JMS, but it looks like essentially the same
> thing.
> Cheers,
> Dave
>
___
List sponsored by Redwood Alliance

Pay optional member dues here: http://re-wrenches.org

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

There are two list archives for searching. When one doesn't work, try the other:
https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/
http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org

List rules & etiquette:
http://www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
http://www.members.re-wrenches.org

Re: [RE-wrenches] 1,000 v combiners

[Corey Shalanski]

Hello Kris,

A few options for 1000 Vdc combiners:

   - Bentek
   
<https://www.bentek.com/wp-content/uploads/ds/991-003870-000-B_Bentek-Ungrounded-IntDisc-Combiners-DS.pdf>
   - ConnectPV
   
<https://www.connectpv.com/wp-content/uploads/2017/05/Standard-Disconnect-Combiners-Rev-5.0.pdf>
   - SolarBOS
   
<http://www.solarbos.com/content/common/common.download_file.php?action_special=download_file&sid=afafae6023afd64e72f2a21fb75b1f49&download_file_id=1901801>

If the above options are not available for some reason, you could always
look bigger—all of the above manufacturers offer 1500 Vdc combiners, and it
looks like Shoals
<https://cc384905-38c5-4310-8bcd-a3fa7f1f685b.filesusr.com/ugd/8e18b2_2ac4232be9d3476d81aabe2abd200388.pdf>
does as well.

--
Corey Shalanski
Jah Light Solar
Portland, Jamaica


On Mon, Jul 12, 2021 at 6:39 PM Kristopher Schmid  wrote:

>
> Hi All,
>
> Just wondering what you commercial installers are using for 1,000 volt
> combiners.  I don't work in this realm often.  I am looking at Solar BOS.
> Any recommendations would be appreciated.
>
> Thanks,
> Kris
>
___
List sponsored by Redwood Alliance

Pay optional member dues here: http://re-wrenches.org

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

There are two list archives for searching. When one doesn't work, try the other:
https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/
http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org

List rules & etiquette:
http://www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
http://www.members.re-wrenches.org

Re: [RE-wrenches] Dial torque wrench for S-5 Clamps

[Corey Shalanski]

Jason,

If you're looking to bite any bullets, a contractor recently alerted
me to Makita
torque control nut runners
<https://makitaassemblytools.com/products/tools/assembly?id=71#c:torque-control-nutrunners>.
I know they ain't cheap, but they're very handy for consistent repetitive
torquing tasks (e.g., commercial flat roof racking assembly).

I never imagined I would see a hand tool with an onboard USB port and
application software!

--
Corey Shalanski
Jah Light Solar
Portland, Jamaica


On Sun, Jun 13, 2021 at 11:40 AM Jason Szumlanski <
ja...@floridasolardesigngroup.com> wrote:

>
> Does anyone have a good recommendation for an easy to use model on the
> roof? My cheap one finally broke and it was hard to read anyway.
>
> Or should I bite the bullet and get a calibrated impact driver?
>
> Or both?
>
> Jason Szumlanski
> Florida Solar Design Group
>
___
List sponsored by Redwood Alliance

Pay optional member dues here: http://re-wrenches.org

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

There are two list archives for searching. When one doesn't work, try the other:
https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/
http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org

List rules & etiquette:
http://www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
http://www.members.re-wrenches.org

[RE-wrenches] Integrating with Lightning Protection

[Corey Shalanski]

Wrenches,

I see that this topic was discussed back in 2015
<https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/msg19683.html>
and there were some excellent resources shared on how to electrically
integrate PV arrays with existing lightning protection systems (LPS). I am
curious if anyone has any advice about how to physically/mechanically
integrate a commercial rooftop array with an LPS—particularly wondering
what to do when we encounter a network or web of LPS cabling laid out
across the roof. I am assuming we should not simply move the cabling
without first consulting with the LPS contractor... Can a ballasted racking
system viably be placed over top of the cabling? Can ballast bases be
placed directly on top of the cabling? or be made to somehow span over or
be elevated above the cabling? Or is this just a case where we need to
limit the PV array to whatever areas of the roof offer the least
interference/convergence with LPS cabling?

--
Corey Shalanski
Jah Light Solar
Portland, Jamaica
___
List sponsored by Redwood Alliance

Pay optional member dues here: http://re-wrenches.org

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

There are two list archives for searching. When one doesn't work, try the other:
https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/
http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org

List rules & etiquette:
http://www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
http://www.members.re-wrenches.org

Re: [RE-wrenches] MC4s are listed for THWN, right?

[Corey Shalanski]

Chris's reminder is a good one—the 600V rating of most insulated
"multi-tap" connectors pretty much limits their use to residential systems.
I would also keep in mind that those connectors generally have a torque
spec. I've definitely seen examples of meltdowns caused by poor
terminations - either the compression screw isn't torqued properly or the
conductor isn't fully inserted. To help eliminate the latter case, we used
to favor the Burndy models (e.g., BIT4
<https://www.hubbell.com/burndy/en/Products/Power-Utilities/Connectors/Lugs-Terminals/Bolted/Vinyl-Insulated/BIT4/p/2021315>)
because they had a transparent case; I see that Polaris also now offers
transparent models (e.g., IT-4C
<http://www.nsiindustries.com/catalog/nsiproducts/polaris-mechanical-connectors/polaris-vision-tap/it-4c>
).

--
Corey Shalanski
Jah Light Solar
Portland, Jamaica


On Wed, Apr 28, 2021 at 7:38 AM Chris Sparadeo  wrote:

> Keep in mind that Wagos, Polaris lugs, Multi-tap Burndy lugs are rated for
> 600V. I can see this being a possible use for MC4 connectors in a higher
> voltage splice scenario, because of their 1000V/1500V ratings.
___
List sponsored by Redwood Alliance

Pay optional member dues here: http://re-wrenches.org

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

There are two list archives for searching. When one doesn't work, try the other:
https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/
http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org

List rules & etiquette:
http://www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
http://www.members.re-wrenches.org

Re: [RE-wrenches] MC4s are listed for THWN, right?

[Corey Shalanski]

Blake,

In addition to Bryan's notes, here is some unconfusing information directly
from Stäubli's engineering dept:

The answer is categorically no: *you cannot use THHN wires with MC4
> connectors.*  There are several reasons for this:
> 1. *Certification*: our MC4 connectors are certified to UL6703, which
> only covers UL4703 PV wire or USE2 cable.  Any other wire type is not
> covered by our certification
> 2. *Internal validation*: we have no internal testing or validation
> of how MC4 or Evo2 connectors perform with THHN cables.  We therefore
> cannot warranty / accept the use of THHN cables with our PV connectors.
> The allowable cables and applications for our PV connectors is clearly
> stated in the assembly instructions.
> 3. *Construction*: THHN cables use very rigid PVC insulators, which
> behave very differently than XPLE or TPE insulators that are the most
> widely used on PV wires.  PVC has a very low elastic range and easily
> deforms permanently under load/thermal cycling.  It is not a well-suited
> cable for higher temperature or high temperature fluctuating applications
> where compression-type cable seals (i.e. cable glands) are used.  Also,
> THHN cables tend to be single-conductor solid core cables, which are
> absolutely not allowed with crimp terminations like the MC4 (or any other
> PV connector on the market for that matter).  They also are not allowed by
> UL6703.


These comments were forwarded to me by Jeff Wang, who works for Stäubli
North America.

--
Corey Shalanski
Jah Light Solar
Portland, Jamaica


On Mon, Apr 26, 2021 at 9:23 AM  wrote:

>
> Bryan,
>
> Thank you for the link.  I am confused by the "PVC" section you
> referenced.  Here's the complete text:
>
>   For safety reasons Stäubli prohibits the use of PVC cables. Cables made
>> from PVC can be connected to MC4-Evo 2 since the insulation material of the
>> connector (Polyamide) is suitable to be connected to PVC. PVC cables
>> usually have an upper limiting temperature of 70 °C, in fixed installations
>> sometimes 80 °C.
>
>
> THHN/THWN-2 is made with PVC insulation, so I assume that it falls under
> the category of a "PVC cable."
>
> So, the first sentence seems to say that it's not allowed by Staubli.  But
> then the second sentence seems to say that is IS allowed.  And then the
> third sentence doesn't seem to be contemplating the most common PVC wire
> type of all (in the US), which is THHN/THWN-2, which has a 90 degree
> rating?!
>
> Can you help un-confuse me?
>
> Thank you!
> Blake
>
___
List sponsored by Redwood Alliance

Pay optional member dues here: http://re-wrenches.org

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

There are two list archives for searching. When one doesn't work, try the other:
https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/
http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org

List rules & etiquette:
http://www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
http://www.members.re-wrenches.org

Re: [RE-wrenches] IAEI Online Articles

[Corey Shalanski]

Just wanted to let everyone know that the IAEI Magazine online articles
 appear to be back up and running.
CS


On Mon, Aug 24, 2020 at 5:55 PM Corey Shalanski  wrote:
> Thanks for that info, Ryan. I noticed the following note posted on the
> page you linked: [Update: IAEImagazine.org is currently unavailable due to
> a network server error.]
>
So hopefully it is just a temporary technology issue and free access to the
> article archive can be restored soon.
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

There are two list archives for searching. When one doesn't work, try the other:
https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/
http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org

List rules & etiquette:
http://www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
http://www.members.re-wrenches.org

Re: [RE-wrenches] how to prevent selling to grid with grid tie inverter

[Corey Shalanski]

Hello Greg,

As Will mentioned, this mode of operation is doable with SolarEdge, but it
will require some additional hardware—specifically, you will need an energy
meter as well as CTs for each power phase.

Here is some documentation to get you started:
- Export Limitation brochure
<https://d1c96hlcey6qkb.cloudfront.net/de1543db-d336-4a89-9a35-dfb08ac7a6c6/316c59969efe4bcd8d98ed461864612c?response-content-disposition=inline%3B%20filename%2A%3DUTF-8%27%27Export%2520Limitation_Residential%2520flyer_ROW.20200727133751107.pdf&response-content-type=application%2Fpdf&Expires=1617321600&Signature=LYeT1QuE0gbaDBl11Khs82CHcxAQ6AwH3ShnOUPy4Mn9wZU2yfp58AV2u5CnXw-Msd39gaIVaeVhLY553LgmA-3OjoLBgnr7D6srKYZXRwxXlN8y24OVc~28jmheitiU~IFgcsxJNyfEFmdueDCzcH1kgN-bXCXD-FDwO5Fr6weysBqw3~6cK0~1A00WUTuwBuQoAbtzWYXhXbrtNf1kYPAYHXI-T10Bc8uvXcapCmUagkNJSjuJW7OSCPUEKtZdV0x1gkKaaocJU3TaQViIKY6Bwrw0qIqo4uBoNyT-rF5Mu-So3Pf4d8fDterfQa2OKHbqIX6RJIzOIBVmRT1-JQ__&Key-Pair-Id=APKAI33AGAEAYCXFBDTA>
- Energy Meter webpage
<https://www.solaredge.com/us/products/metering-and-sensors/solaredge-residential-electricity-meter>
- Export Limitation application note
<https://d1c96hlcey6qkb.cloudfront.net/de1543db-d336-4a89-9a35-dfb08ac7a6c6/f0f8ba991b974f37bba1112cce845f09?response-content-disposition=inline%3B%20filename%2A%3DUTF-8%27%27Export%2520Limitation%2520v2.5.20201123105127969.pdf&response-content-type=application%2Fpdf&Expires=1617321600&Signature=Zo3EK-tZ~Zp60hmFWhY-i-6NrpRbAjGXRop5bHutXj8M9EYJgZHIBz2Abtv0H1Rutq9cYv0wkHPwygMMOHgs1kTd-RvDxcrjJ-WVISIStN~HrK6JGKoD3x6pBoNZ7at9PtTn0j4mpiyJ-BtzRRZZNKT1dufsmLxErAa8NUseb89WtmAjaGQIF2ffX6J2QmxcISz4kBzsMS8kZw4Vr-fpDshzgOznzElEInr8CLB5lYmT5Emu2Et~JL47fjLVMCEE3TupX4WTQaJpoU9tr2gQU8YZC6m~dJtbhLouGpkOYb5WiO-BiQbLvjFNk-2uyn3I-ZjLlPjc87xox4krsMs6sQ__&Key-Pair-Id=APKAI33AGAEAYCXFBDTA>

You'll note that SolarEdge calls this feature "export limitation" as
opposed to simply "zero export." That is because the user can limit the
amount of power (e.g., 1 kW, 2 kW, etc.) that is exported - or none* at all.
*Related to Jason's point, please note the following information included
in the application note (page 24):
" “Zero export” term can be misleading at times as one may think that
export to the grid
is always avoided. In fact, “zero export” mode is expected to export some
energy to the
grid in some edge cases. The solar systems strives to produce as much power
as
possible for the site consumption, however, load change events constantly
occur. The
zero export-regulated system tries to match production-power and
load-consumption-power at all times. During the transition periods, some
export power is inevitable."

--
Corey Shalanski
Jah Light Solar
Portland, Jamaica


On Tue, Mar 30, 2021 at 5:24 PM  wrote:

>
> Wrenches, I've got a small system using SolarEdge inverter (4 kW) that
> is supposed to go in to a small town that does not allow selling power
> to the grid.  That may change but that is how it stands now.  The
> customer wants to use the power that is generated but can not sell or
> even give excess power away.  Do any of you have any experience setting
> up a grid tie no battery system so that it can not sell to the grid
> under any circumstances?  Just wondering before I dig any deeper if
> there's an obvious solution I'm missing. Thanks,
>
> Greg Egan
> Remote Power Inc.
>
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

There are two list archives for searching. When one doesn't work, try the other:
https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/
http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org

List rules & etiquette:
http://www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
http://www.members.re-wrenches.org

[RE-wrenches] NEC 690.8(A) - Bifacial Modules

[Corey Shalanski]

Wrenches,

I am curious if anyone can offer guidance on how to treat the *multiple*
Isc ratings for bifacial modules when calculating the maximum circuit
current for PV source/output circuits. As a reminder, the maximum circuit
current is defined as "the sum of the short-circuit current ratings of the
PV modules connected in parallel multiplied by 125 percent." (NEC 2020)

However, bifacial module datasheets generally include *two* short-circuit
current ratings - one at STC and another at BSTC ("Bifaciality given for
rear side irradiation on top of front side STC"). As an example, a certain
bifacial module has an Isc @ STC rating of 10.6 A and an Isc @ BSTC rating
of 11.6 A. What are designers using for the 690.8(A) calculation? Still
sticking with the STC rating? or instead using the BSTC rating? or perhaps
a hybrid of both (depending on some qualitative assessment of the site
conditions and expected back side gain)?

--
Corey Shalanski
Jah Light Solar
Portland, Jamaica
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

There are two list archives for searching. When one doesn't work, try the other:
https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/
http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org

List rules & etiquette:
http://www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
http://www.members.re-wrenches.org

Re: [RE-wrenches] Protecting New Roofing during Summer

[Corey Shalanski]

Hi August,

I misunderstood James' question a bit at first, but having reread it I
would agree that shingles are still subject to softening and potential
tearing when they are new and the time is hot. I used to judge the relative
success of our roof protection measures by the amount of aggregate found in
the gutter at the end of the installation. It is remarkable how much less
skidding occurs - and subsequently how much less aggregate gets displaced -
when you are wearing Cougar Paws. In that sense at least, I believe their
"good grip" does help to protect the roof, no matter the weather (hot,
cold, etc.) or shingle age.

BTW, I like the walking-on-rice-paper analogy. I would make that video
mandatory viewing for each crew member before they climb the ladder on the
first day of a hot day/new shingle installation - not to influence their
working/safety habits, but just so that they keep the "soft step" mantra in
mind. Sometimes you can only do so much, though, and if it looks like
shingle damage is going to be a real problem then it might be best to have
a realistic conversation with the customer and propose delaying the project
a few months?

--
Corey


On Wed, Mar 9, 2021 at 12:47 PM August Goers  wrote:

>
> Corey and Others Who Have Used Cougar Paws:
>
> Have you found that these special shoes will protect the roof when it is
> hot out? It seems like they are touting the good grip on their website, but
> not necessarily that they protect the roof.
>
> Best,
>
> August
>
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

There are two list archives for searching. When one doesn't work, try the other:
https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/
http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org

List rules & etiquette:
http://www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
http://www.members.re-wrenches.org

Re: [RE-wrenches] Electric Crimper Recommendations

[Corey Shalanski]

Hi Chris,

When our company began installing utility-scale PV projects, we purchased a
Milwaukee M18 FORCE LOGIC crimper (
https://www.milwaukeetool.com/Products/Power-Tools/Electrical-Installation/Crimpers).
I haven't personally worked with any other brands of electric crimpers, so
I cannot offer any comparative feedback, but as you said it definitely "cut
down on the struggle" and quickly became a prized tool amongst our
installers. Since we worked with a wide variety of equipment (inverters,
switchboards, transformers, etc.) with a variety of conductor sizes, we
opted to purchase one of the accompanying multi-size die kits. All in, I
recall the crimper + die kit costing us around $3000. I'm guessing you
would be able to bypass the whole-hog die kit and instead purchase just a
few different die sizes for your battery lugs - and thereby save some money.

--
Corey Shalanski
Jah Light Solar
Portland, Jamaica


On Sun, Feb 21, 2021 at 4:40 PM Chris Sparadeo  wrote:

>
> Hi all,
>
> I’m wondering if anyone has recommendations for an electric crimper tool
> for battery lugs? I see that they can get expensive quickly, but a tool
> that cuts down on the struggle is a tool worth considering.
>
> Thanks in advance!
>
> -Chris
> --
> Chris Sparadeo
>
>
> C_802-369-4458
> H_802-728-3059
>
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

There are two list archives for searching. When one doesn't work, try the other:
https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/
http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org

List rules & etiquette:
http://www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
http://www.members.re-wrenches.org

Re: [RE-wrenches] Solar Edge optimizer attachment using EcoFoot 2 mounting

[Corey Shalanski]

Hi Carl,

A company that I recently began consulting for has several projects in
their portfolio that match your description: Ecolibrium Solar EcoFoot2+
racking, 72-cell PV modules, SolarEdge P860 optimizers. They have used
either the Ecolibrium Solar MLPE Bracket
<https://ecolibriumsolar.com/downloads/support/ecofoot-mlpe-bracket-adden.pdf>,
which attaches to the EcoFoot base, or the Quick Mount PV Accessory Frame
Bracket <https://www.quickmountpv.com/pdfs/QMAFBU_UL.pdf>, which attaches
to the module frame; another frame-mounted option would be the Unirac MLPE
Mount
<https://unirac.com/wp-content/uploads/pdf/2016DEC05-MLPE-Installation_Guide-PUB_245-1.pdf>.
Please see attached photos (admittedly not great resolution) of P860
optimizers attached to the Ecolibrium brackets.

One word of warning: When the modules are installed in landscape
orientation, we realized it is difficult/impossible to manage the P860
output cables in a Code-compliant manner. This is due to the output cables
being slightly short compared to the length of the module frames and
generally results in insufficient bending radius of the cable where it
attaches to the optimizer. SolarEdge does offer a P860 optimizer with
longer output cables, but we are told they have a 20-week lead time.

--
Corey Shalanski
Jah Light Solar
Portland, Jamaica


On Mon, Aug 31, 2020 at 9:37 PM Carl Adams  wrote:

>
> I have a project requiring the Solar Edge optimizers (P370 or P860) on an
> Ecofoot 2 mounting system with 72 cell modules.  Curious as to what is
> being done to mount the  optimizers to either the module frame or the
> Ecofoot 2 base.  A picture could be worth a thousand words.
>
> With Kind Regards
> Carl Adams, President
> SunRock Solar, LLC
> 513.290.9072 (mobile)
> 513.766.6025 (office)
>
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

[RE-wrenches] 1500 Vdc Combiners/Disconnects

[Corey Shalanski]

Wrenches,

I am curious if anyone can recommend a dc combiner and/or dc disconnect
switch rated for 1500 V / 225 A? I am having particular difficulty sourcing
an enclosed disconnect switch (or "isolating device" per NEC 2017).

--
Corey Shalanski
Jah Light Solar
Portland, Jamaica
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

[RE-wrenches] Cable Tray Marking

[Corey Shalanski]

Wrenches,

I am curious about the marking requirements for cable trays containing PV
source/output circuits rated over 600 volts, installed on a building:


NEC 392.18(H) requires a permanent, legible warning notice carrying the
wording “DANGER — HIGH VOLTAGE — KEEP AWAY” at least once every 10 ft.

NEC 690.31(G)(3) requires a label or marking with the wording "WARNING:
PHOTOVOLTAIC POWER SOURCE" at least once every 10 ft.

Does the 690.31 label take precedence? Are there any situations where both
labels would be required (or recommended)?

--
Corey Shalanski
Jah Light Solar
Portland, Jamaica
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

[RE-wrenches] Rapid Shutdown on Parking Garage

[Corey Shalanski]

Code gurus,

It seems that a parking garage is properly considered to be a "building"
under NEC Article 100 definitions—and that 690.12 rapid shutdown
requirements would therefore apply.

I am wondering if anyone has successfully argued that 690.12 should *not*
apply to systems installed on the top deck of a parking garage?

--
Corey Shalanski
Jah Light Solar
Portland, Jamaica
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

Re: [RE-wrenches] IAEI Online Articles

[Corey Shalanski]

Thanks for that info, Ryan. I noticed the following note posted on the page
you linked:

[Update: IAEImagazine.org is currently unavailable due to a network server
error.]

So hopefully it is just a temporary technology issue and free access to the
article archive can be restored soon.
--
Corey


On Thu, Aug 20, 2020 at 12:41 PM Ryan Mayfield  wrote:

>
> Looks like they changed their URL (and access style), seems odd they don't
> have the old one redirect you...
>
>
> https://www.iaei.org/Online/Magazine/Online/IAEI_Magazine.aspx?hkey=859b0900-7ea8-490b-8915-0c5993d14a89
>
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

[RE-wrenches] IAEI Online Articles

[Corey Shalanski]

Does anyone know what happened to the online IAEI magazine article website:
https://iaeimagazine.org/

It no longer seems to be accessible?

--
Corey Shalanski
Jah Light Solar
Portland, Jamaica
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

[RE-wrenches] Cleaning Modules

[Corey Shalanski]

Greetings Wrenches,

I posed this question to the group a number of years ago and would like to
ask it again, in case any new members have new ideas or any elders have
adjusted their approach.

I am wondering if anyone can offer tried-and-true tips for cleaning
modules: tools, materials, methods? I am particularly interested in
cleaning solutions for large commercial flat-roof installations.

I have always had success using a mild soap solution to help loosen
dirt/pollen, but I recently read an article specifically advising against
this:
https://www.solarpowerworldonline.com/2020/05/pro-tip-never-use-soap-to-clean-dirty-solar-panels/
Any reactions?

--
Corey Shalanski
Jah Light Solar
Portland, Jamaica
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

[RE-wrenches] Rooftop Conduit

[Corey Shalanski]

Wrenches,

I noticed a couple good threads ("Cable tray" / "PV Wiring methods") about
this topic back in 2013, but I haven't seen much discussion since then.
Given some of the advances in PV equipment since then (improved
ground-fault protection, arc-fault circuit protection, rapid shutdown), I
am curious about current attitudes toward using metallic conduit/cable tray
on rooftops. I am primarily interested in hearing about flat commercial
rooftops but imagine some of the same conventions may apply for residential
rooftops.

What are you using for long (or short) dc circuit runs on rooftops? Is
cable tray still considered safer? Are there situations where conduit may
be merited? If so, is RMC favored over EMT?

Do best practices change when considering ac circuits (rather than dc)?

Back in 2013 Bill Brooks said that PV installers are the "crazy people"
installing conduit on rooftops, and he prophesied that using cable tray on
roofs would "become common practice soon." Where do we stand now?

--
Corey Shalanski
Jah Light Solar
Portland, Jamaica
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

[RE-wrenches] MLPE Mapping

[Corey Shalanski]

Wrenches,

After 10+ years of MLPE (microinverters/optimizers) gaining traction in the
industry, I have noticed one stubborn issue that somehow still haunts us. I
think we as installers have all been there at some point: laying down the
final module in an array, high fives all around, time to look at the
close-out checklist that our pesky operations manager handed to us on our
way out the door, and then realizing that we forgot to peel off the MLPE
serial number stickers (or otherwise record them) in order to make a map...

Even when installers forget to record just one serial number, retrieving it
can be difficult and time-consuming. Raise your hand if you've ever
attached your cell phone/camera to an extendable pole and slid it under the
array in hopes of catching that one forgotten label!

In this age of smart devices, I anxiously await the day when MLPE will be
able to map themselves. But until that day comes, I am wondering if anyone
has developed or knows of a tried-and-true foolproof method for capturing
MLPE serial numbers?

--
Corey Shalanski
Jah Light Solar
Portland, Jamaica
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: 
http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

Re: [RE-wrenches] Label Durability

[Corey Shalanski]

Hi Jesse,

We did in fact use Sharpie on the test wall. I made the mistake of writing
the "start date" for the test wall in Sharpie, but I think it only lasted
the first couple years. As others have pointed out, the ink will usually
fade and become illegible within a few years - depending on the level of
direct sunlight exposure. I've got plenty of photos from site re-visits
showing labels with handwritten numbers that are no longer visible. As
Martin pointed out, it's questionable whether labels can even include
handwritten text based on NEC 110.21(B)(2)... So, I guess in response to
your follow-up comment, feel free to show those folks this photo along with
the message “here is your sharpie” (it's completely vanished).

We experimented with nylon labelmaker tape and found that to generally hold
up better than Sharpie. We also tried out a handheld engraving tool (for
plastic/phenolic labels), but that was kind of a non-starter. At one point
we even invested in a full-fledged engraving machine. I believe it came
with its own software, and we purchased sheets of blank placard material.
Unfortunately, we could never get our machine operator to turn the corner
on making the label creation process efficient & worthwhile--the last I
looked, the machine was sitting in a dark corner of the lunchroom.

I agree with Brian/Dan that the different components in a PV system have
different expected lifespans, and we can't reasonably expect all components
to last as long as the longest-lasting component (PV modules). Labels seem
to be one of those components that we can anticipate replacing every 5-10
years.

--
Corey


On Sat, Jun 27, 2020 at 6:06 PM  wrote:

>
> Did you use a sharpie on the box? I wonder how a sharpie or PICA marker
> would hold up for 10 years.
>
> It’s an awesome test though. I love it.
>
> Jesse
>
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: 
http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

Re: [RE-wrenches] Label Durability

[Corey Shalanski]

Hi Jay,

The test wall is oriented at 161° S-SE, according to Solmetric's roof
azimuth tool .

--
Corey


On Sat, Jun 27, 2020 at 12:00 PM  wrote:

> Hi Corey
>
> Well done.
>
> Question
>
> What is the orientation of this test?
>
> Jay
>
> Peltz Power.
>
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: 
http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

Re: [RE-wrenches] Floatovoltaics

[Corey Shalanski]

Hi Dave,

I was actually referring to a growing trend in the PV industry
(particularly in Asia) to attach PV arrays - and also inverters in some
cases - to floating pontoons and then install them on bodies of water. The
systems are often referred to as floating PV (FPV) or "floatovoltaics".
Here's an NREL link which provides further information about the concept:
https://www.nrel.gov/news/press/2018/nrel-details-great-potential-for-floating-pv-systems.html

--
Corey Shalanski
Jah Light Solar
Portland, Jamaica


On  Sun, 14 Jun 2020 07:30:14 -0700, Dave Angelini wrote:

>
> I know both Schneider mppt's can be negative, positive, or ungrounded.
> Others must do this also. Is that what you are asking?
>
> They work as
> expected as far as I have seen.
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: 
http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

[RE-wrenches] Floatovoltaics

[Corey Shalanski]

I am curious if any Wrenches have experience with floating array (aka
"floatovoltaic") systems? From the limited research I have done, there only
appear to be a handful of solutions providers - mostly based in Europe or
Asia. I'd be interested to hear any testimonies - good or bad - about your
experiences with the equipment and/or installation process.

--
Corey Shalanski
Jah Light Solar
Portland, Jamaica
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: 
http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

[RE-wrenches] Commercial Inverters - Neutral Conductor

[Corey Shalanski]

Greetings Wrenches,

I am curious about the requirement or non-requirement to run a neutral
conductor in the output circuit for commercial (3-phase) inverters. I
understand that this requirement will not apply in certain scenarios simply
due to the grid configuration, e.g. 480 Vac delta. I also understand that
the installation manual for each inverter must firstly be consulted to
check for such requirement/non-requirement, and that any instructions found
there will generally take precedence over *NEC* language. *Can anyone speak
to any other general rules regarding whether or not to run the neutral?*

Assuming a neutral conductor is run for "instrumentation, voltage
detection, or phase detection" per 705.95(B), *would this conductor be
counted as a *current-carrying* conductor when applying the adjustment
factors found in 310.15(B)(3)(a)?*

--
Corey Shalanski
Jah Light Solar
Portland, Jamaica
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: 
http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

[RE-wrenches] Rail-less Racking

[Corey Shalanski]

I am wondering if anyone on the List has significant experience installing
rail-less racking systems (Quick Mount PV Quick Rack, Roof Tech E Mount
AIR, SnapNrack RL Universal, etc.) and can speak to the pros and cons
versus rail-based systems?
Also wondering if anyone has strong opinions regarding the lesser air gap
below modules with rail-less systems and how much, if at all, that might
affect production? *bonus points awarded for providing quantitative data

--
Corey Shalanski
Jah Light Solar
Portland, Jamaica
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: 
http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

[RE-wrenches] Site Groundskeeping

[Corey Shalanski]

This is not so much a "wrench" question--more like a "lawnmower" question...

For anyone involved with large-scale ground mount systems, I am curious
about the various methods being used to control vegetation. My sense has
been that O&M service providers generally gravitate toward gas
mowers/trimmers with spot application of chemical herbicides. Does anyone
have any experience with alternative methods, such as specialized seeding
(e.g. pollinator-friendly), groundcover plants, goat herds, maybe even
robotic GPS-guided mowers? I'm especially interested to hear from anyone
who has analyzed the pros/cons of different methods or who can speak to any
approaches that might be site-specific.

--
Corey Shalanski
Jah Light Solar
Portland, Jamaica
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: 
http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

[RE-wrenches] Rapid Shutdown Compliance

[Corey Shalanski]

Now that 690.12 of the *NEC* 2017 has been in effect for several years, I
am curious how designers and installers are meeting the associated
requirements with string inverter-based systems (*not* considering
microinverters or DC optimizers). I am generally a fan of the KISS
principle, and as best I can determine the *Tigo* TS4-F device is one of
the simplest options currently available on the market. What are others
finding?

I'd love to hear about favored options for complying with rapid shutdown.
Any success stories? or better yet, any early failures?

--
Corey Shalanski
Jah Light Solar
Portland, Jamaica
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: 
http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

Re: [RE-wrenches] Industry Publications

[Corey Shalanski]

Related question: I always considered the *Home Power* and *SolarPro *article
search features to be really valuable parts of their websites, but neither
of these appear to be still available. I believe the *HP* article archive
DVD supports keyword searches (via Acrobat or other PDF viewer), but I am
looking for more of an online-based option. Is anyone aware of any other
efforts to catalog the articles and/or develop a searchable keyword
database?
-Corey


On Thu, Apr 16, 2020 at 11:28 PM Corey Shalanski  wrote:

>
> Wrenches,
>
> Like myself, I imagine many folks on this list were avid readers of "Home
> Power" and "SolarPro" magazines. I know some of you were even active
> contributors to these two wonderful publications.
>
> Is anyone aware of any similar resources - geared toward system
> designers/installers/technicians (or just general enthusiasts)? Besides
> this list, where are Wrenches turning to nowadays for relevant discussion
> of current industry topics?
>
> --
> Corey Shalanski
> Jah Light Solar
> Portland, Jamaica
>
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: 
http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

[RE-wrenches] Industry Publications

[Corey Shalanski]

Wrenches,

Like myself, I imagine many folks on this list were avid readers of "Home
Power" and "SolarPro" magazines. I know some of you were even active
contributors to these two wonderful publications.

Is anyone aware of any similar resources - geared toward system
designers/installers/technicians (or just general enthusiasts)? Besides
this list, where are Wrenches turning to nowadays for relevant discussion
of current industry topics?

--
Corey Shalanski
Jah Light Solar
Portland, Jamaica
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: 
http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

[RE-wrenches] RE-Wrenches Search Page

[Corey Shalanski]

Dori/John,

Re. lightning protection, I would suggest searching the archives before
posting any questions - this is a standard practice I use before sending
any messages to their email address .

Oddly enough there seem to be two search pages:

   - RE-Wrenches search page (1)
   

   - RE-Wrenches search page (2)
   

I would suggest bookmarking these - I find myself referring to them quite
often!

--
Corey
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: 
http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

Re: [RE-wrenches] 1,000 volt-rated connectors

[Corey Shalanski]

To continue this thread... Does anyone know of any 1,500 volt-rated
insulated connectors, preferably similar to a GTAP or Easy-Splice?

We are looking for something that can be used to splice #6 PV Wire and can
be installed within the array.

--
Corey Shalanski
Joule Energy
New Orleans, LA


On Mon, Sep 11, 2017 at 1:58 PM,  wrote:

>
>
> Aloha.
>
>
>
> Does anyone know of any 1,000 volt-rated insulated connectors?
>
>
>
> I checked the Polaris line but they're only rated to 600V.
>
>
>
> Mahalo,
>
> marco
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: 
http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

[RE-wrenches] Transformer Nomenclature/Protection/Grounding

[Corey Shalanski]

I'm seeking some guidance on how to treat transformers when included in a
PV system.

Specific system details:
- (3x) SolarEdge 33.3 inverters combined in a 200A panel
- 480/208 transformer to be installed between 200A panel and main
distribution panel (service is 208 wye)

My questions:

- Is there any consensus on what circuit is considered the "primary" and
which is the "secondary" in this type of scenario?
   - NEC 690.9(D) speaks of "considering first one side of the transformer,
then the other side of the transformer, as the primary". Is this relevant?
i.e. Is it possible for both sides of the transformer to be labeled as a
primary?

- I understand that 450.4(A) requires overcurrent protection on the "input
conductors" (aka "primary conductors"?), correct? Must we provide
overcurrent protection on the "other" side in the above scenario?
   - We were originally planning to land each inverter output on a 50A
breaker inside a 200A main lug panel - must we also include a main breaker?

- How do we size the grounding conductors on either side of the transformer?
   - Is the grounding conductor between MDP and transformer considered an
EGC (250.122)?
   - Is the inverter-side of the transformer considered a separately
derived system, in which case the grounding conductor would be considered a
GEC (250.102(C)(1))?

Thanks for any advice!

--
Corey Shalanski
Joule Energy
New Orleans, LA
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: 
http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

[RE-wrenches] Underground Data Transmission

[Corey Shalanski]

Our company typically uses Belden 3106A cable (22AWG) for data transmission
on our larger PV sites, which often involves underground runs. We were
recently informed by the manufacturer that this particular cable is not
rated for underground use - whether in conduit or direct burial - and that
furthermore they only offer a 24AWG underground rated cable ($$) or would
have to custom manufacturer a 22AWG version ($$$)

We are wondering what product/method other groups are using for underground
data transmission?

--
Corey Shalanski
Joule Energy
New Orleans, LA
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: 
http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

[RE-wrenches] Panelboards in Series - Bus Ratings

[Corey Shalanski]

*Scenario*

   - 600A *dedicated PV* subpanel w/ (6) 100A circuit breakers, each
   feeding a 60kW inverter (72.2A rated output)
   - Subpanel is fused at 600A and connects to a larger main
   distribution/combiner panel along with other similarly configured subpanels

*Question*

   - Must the main panelboard be sized based on the combined total of OCPDs
   protecting the subpanels, e.g. 600A + 600A + 600A + 600A = 2400A main panel
   rating?
   - Or can the main panelboard be sized based on the combined total of
   inverter output ratings feeding the panel, e.g. 433.2A + 433.2A + 433.2A +
   433.2A = 1732.8A main panel rating?

--
Corey Shalanski
Joule Energy
New Orleans, LA
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: 
http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

[RE-wrenches] Trench Wiring - Ampacity Derating

[Corey Shalanski]

How should we treat direct burial wires in a trench for ampacity derating
purposes?
- Should they be considered "in a raceway or cable"? [NEC 310.15(B)(3)(a)]
- If it is determined that "spacing" must be maintained, what minimum
spacing is acceptable/permissible?

I would be interested to hear what means and methods others have used to
deal with this issue.

--
Corey Shalanski
Joule Energy
New Orleans, LA
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: 
http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

[RE-wrenches] Power Quality Test

[Corey Shalanski]

The contract for one of our upcoming utility-scale projects includes a
requirement for recording/analyzing power quality: "Submit a report that
includes AC voltage, current, impedance, frequency, the maximum and minimum
of ranges continuously during the 72 hour period with intentional and daily
start up and shut down trials. Devices such as a Candura Power Pro or Power
Site can be used to analyze power."

Does anyone have experience with either of these devices and can comment on
their use? Or else can you recommend a similar device that will fulfill
these requirements?

--
Corey Shalanski
Joule Energy
New Orleans, LA
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: 
http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

[RE-wrenches] AC/DC in Same Trench?

[Corey Shalanski]

For some upcoming utility-scale projects our design team is wondering about
placing direct-bury AC and DC circuits in the same trench.
- Firstly, is this even *Code*-permissible?
- Secondly, are there any common sense reasons (induced voltage/signal
interference/etc) for not doing this?

Thanks,
Corey Shalanski
Joule Energy
New Orleans, LA
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: 
http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

[RE-wrenches] #6 PV Wire Transition

[Corey Shalanski]

We're looking for a way to transition from #6 PV wire to #8/#10 PV wire
wye-harnesses. Unfortunately Multi-Contact doesn't seem to manufacture a
#6-compatible MC4 connector. Has anyone else had to deal with this? or has
any creative solutions?

--
Corey Shalanski
Joule Energy
New Orleans, LA
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: 
http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

[RE-wrenches] Megawatt System - Combiner Output Wiring

[Corey Shalanski]

We're in the process of designing our first >1MW system. It will include
inverter output combiner panels (potential aggregate current >700A) located
approx 100' from the system disconnects.

Since we have never previously dealt with wires this big (2 sets of
paralleled 500 mcm?) we are thinking that direct burial (aluminum)
conductors might be a good option - any suggestions? What wiring method do
others use for this type of *large ampacity* AC circuit? UF? USE? USE-2?
Other?..

--
Corey Shalanski
Joule Energy
New Orleans, LA
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: 
http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

[RE-wrenches] Direct Burial PV Wire?

[Corey Shalanski]

Umm, is PV Wire rated for direct burial? I have seen several manufacturer
spec sheets that suggest this is the case, but I haven't heard of anyone
ever actually doing this.

Project Information:
1.6 MW single axis tracker
(35) 40 kW string inverters
Trenching from row ends to inverter wall, trench lengths will vary between
15-100 feet.

--
Corey Shalanski
Joule Energy
New Orleans, LA
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: 
http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

Re: [RE-wrenches] K1-Open Fault on SMA SB

[Corey Shalanski]

Jason,

Feedback from SMA is that this issue is the result of a "bad batch" of
components from one of their suppliers - seems  to be related to one of the
internal relays. We have fielded no less than a dozen of these error codes,
and they have always resulted in an RMA. As Gary pointed out you can likely
arrange for the replacement over the phone and save yourself a trip.

I still believe SMA has some of the most knowledgable and devoted support
representatives in the industry. Unfortunately, though, I too have noticed
a sharp uptick in time spent waiting to get ahold of someone whenever I
call them.

--
Corey Shalanski
Joule Solar
New Orleans, LA


Date: Tue, 28 Jun 2016 17:28:27 +
> From: Gary Bassett 
> To: RE-wrenches 
> Subject: Re: [RE-wrenches] K1-Open Fault on SMA SB
>
> Jason, save the visit and spend the time on the phone with SMA, everyone
> I?ve been on has resulted in an inverter replacement. SMA has done this
> over the phone and has not required an onsite visit, unless you do not have
> the serial #.
>
> Gary
>
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: 
http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

[RE-wrenches] Supply Side Interconnection - Parallel Conductors

[Corey Shalanski]

Wrenches,

We are developing the design for an upcoming commercial project with the
following service equipment:
- MDP: 600A, main-lug, 6 main disconnect breakers, parallel 350kcmil
service conductors feeding each main lug

Would anything prevent a supply side interconnection in this scenario? (I
understand that we would need to interconnect on *both* conductors in each
parallel pair)

--
Corey Shalanski
Joule Energy
New Orleans, LA
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: 
http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

Re: [RE-wrenches] Magnum System - Discharged Battery Bank

[Corey Shalanski]

Update on my investigation:
I visited the customer's house yesterday to set up a pulse charger. Much to
my surprise the three batteries that originally registered negative voltage
are now reading positive. Does this make sense - are batteries able to
shift between negative and positive voltages at such a low charge level?

I do not see any evidence of distorted cases.


On Thu, Dec 18, 2014 at 7:58 AM,  wrote:
>
>
> I second tump.
> Most likely a bad /cell battery took out the system.
> As these are VRLA batteries, I'm curious do,the cases look damaged such as
> expanded or sunk in?
>
> Jay
> Peltz power
>
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: 
http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

Re: [RE-wrenches] Magnum System - Discharged Battery Bank

[Corey Shalanski]

For anyone still following this thread:
- Contrary to the manufacturer's claim I just confirmed that it is in fact
100% possible to measure 240Vac across the contacts of this single-pole
relay *when it is switched off*. This is due to voltage sense pass-through
at the grid-tied inverter's output terminals. Many thanks to Jarmo for
helping me come to this realization - I would like to echo some of the
other Wrenches' praise of this message board, such a wonderful resource!

--
Corey Shalanski
Joule Energy
NOLA


On Wed, Dec 16, 2014 at 8:27 PM,  wrote:
>
>
> - SPST Solid state relay installed on Sunny Boy output, controlled via
> Magnum router, serves as secondary overcharge protection to Magnum's
> frequency shift feature. Technician who initially responded claims he
> measured 240v across the relay's terminals - relay manufacturer claims this
> is "100% impossible". We removed the relay from the circuit, and the Sunny
> Boy is again operational.
>
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: 
http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

Re: [RE-wrenches] Magnum System - Discharged Battery Bank

[Corey Shalanski]

The only circuits that are connected to the batteries - other than (2)
MS4448PAE inverters - are the BMK and the SS relay (switching grid-tied
inverter output circuit).


On Wed, Dec 17, 2014 at 4:51 PM,  wrote:
>
>
> Might there be something like that loading the batteries when nobody is
> looking?
>
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: 
http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

Re: [RE-wrenches] Magnum System - Discharged Battery Bank

[Corey Shalanski]

Both the BMK and the RTR (which I've been told is a more sophisticated
version of the ARC) are installed on this system.

We were not immediately able to access the fault history because of the low
voltage situation.


On Wed, Dec 17, 2014 at 8:14 PM,  wrote:Send
>
>
> Good point on the battery monitor. It would be easy to add a Magnum BMK to
> system and get the battery history. Also the ARC (advanced remote control)
> stores fault history so you can see when the LBCO occurred along with
> battery voltage etc.
>
>
> Gary Baxter
> Product Manager
> Magnum/Dimensions
>
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: 
http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

[RE-wrenches] DC in Romex?

[Corey Shalanski]

Wrenches,

In New Orleans there are a lot of raised houses (on piers, etc). Assuming
we kept the array source/output circuits in conduit on the exterior of the
house, would it be Code-permissible to switch to Romex for any DC runs
underneath the house? e.g. to an inverter on the opposite exterior wall?

690.31(E) does not appear to preclude this possibility. Something tells me
this may be a bad idea, but I wanted to hear others' thoughts.

Thanks,
Corey Shalanski
Joule Energy
NOLA
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: 
http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

Re: [RE-wrenches] Magnum System - Discharged Battery Bank

[Corey Shalanski]

FYI, the batteries are Discover Energy EV4DA-A (VRLA - AGM, I believe).


On Wed, Dec 17, 2014 at 12:13 PM,  wrote:
>
>
> Interesting mystery, and great discussion.
> I'm leaning towards a battery cell problem too. Corey mentions 3 strings of
> 4 "12v" batteries -- what are these 12v batteries exactly?
> I've seen issues in the past that convince me a couple parallel battery
> strings are a good thing (but not too many strings); in an open-cell
> failure mode the parallel string keeps the battery bank from
> 'disappearing.'
>
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: 
http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

Re: [RE-wrenches] Magnum System - Discharged Battery Bank

[Corey Shalanski]

Clarification and Update:
- I believe I may have inadvertently thrown Magnum under the bus in in my
initial post.
ᐧ
While on site yesterday I did speak with Magnum's customer support about my
findings and they advised to try to trickle charge the batteries up to the
minimum threshold at which the Magnum inverters would turn back on. From
there we will hopefully be able to run some more determinate tests. My
question about the low-battery-cutout was more intended to explore whether
others have ever experienced any similar issues with this protection
feature. I am finding out that the feature is only relevant during
inverting (not charging) mode and so would imply that the utility feed had
been cut, which does not appear to be the case.
- Our battery distributor has lent us a 12-circuit trickle charger - one
set of alligator clips per battery. I am planning to re-visit the jobsite
later today to put each battery on a trickle charge, which I am told will
take 1-2 weeks for any lasting change to take effect. The distributor
advised to reverse the leads on the batteries with negative voltage, hoping
that they may be recoverable as "reversed pole" batteries thenceforth.

--
Corey


On Tue, Dec 16, 2014 at 8:27 PM,  wrote:
>
>
> Wrenches,
>
> I visited a customer today whose grid-tied battery backup system suffered
> some sort of catastrophic failure, and now I'm trying to play detective to
> figure out what happened and whose equipment/design is to blame.
>
> Here is what I know so far:
> - System is ac-coupled with a Sunny Boy 7000 (7.85kW array), Magnum
> MS4448PAE (x2), 3 strings of 4 12v batts (705Ah total)
> - Site visit was triggered by the Sunny Boy registering zero output via
> online monitoring.
> - SPST Solid state relay installed on Sunny Boy output, controlled via
> Magnum router, serves as secondary overcharge protection to Magnum's
> frequency shift feature. Technician who initially responded claims he
> measured 240v across the relay's terminals - relay manufacturer claims this
> is "100% impossible". We removed the relay from the circuit, and the Sunny
> Boy is again operational.
> - On arrival I found the Magnum display showing a "Low Battery Charge"
> message with the bank measuring ~4Vdc. The individual batteries were in
> various states of charge, ranging from high of 6.3v to low of -2.6v. These
> measurements were taken at rest, all battery cables disconnected, and yes
> three of the batts were registering a negative voltage.
> - Customer reports that he was not aware of any recent prolonged power
> outages.
>
> The three potential suspects would seem to be:
> - SS relay: The customer is convinced that this is the weak link in the
> system and somehow triggered this failure. I am not so convinced but would
> be interested to hear recommendations for properly testing its
> functionality.
> - Magnum equipment: Since there is low-battery-cutout protection, why would
> this feature not have activated and prevented the batteries from draining
> so low?
> - Batteries: I am not very familiar with modes of failure, but our
> distributor suggested that an internal short could be a possibility - what
> might have triggered this?
>
> Clearly I am fishing for potential leads here, so any suggestions are
> welcome.
>
> Thanks!
> --
> Corey Shalanski
> Joule Energy
> New Orleans, LA
>
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: 
http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

Re: [RE-wrenches] Magnum System - Discharged Battery Bank

[Corey Shalanski]

This system was commissioned in January 2013 and has operated without issue
until this recent malfunction.

ᐧ

On Tue, Dec 16, 2014 at 7:54 PM,  wrote:
>
>
> How long has this system been operational?
>
> Jay
> Peltz power
>
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: 
http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

[RE-wrenches] Magnum System - Discharged Battery Bank

[Corey Shalanski]

Wrenches,

I visited a customer today whose grid-tied battery backup system suffered
some sort of catastrophic failure, and now I'm trying to play detective to
figure out what happened and whose equipment/design is to blame.

Here is what I know so far:
- System is ac-coupled with a Sunny Boy 7000 (7.85kW array), Magnum
MS4448PAE (x2), 3 strings of 4 12v batts (705Ah total)
- Site visit was triggered by the Sunny Boy registering zero output via
online monitoring.
- SPST Solid state relay installed on Sunny Boy output, controlled via
Magnum router, serves as secondary overcharge protection to Magnum's
frequency shift feature. Technician who initially responded claims he
measured 240v across the relay's terminals - relay manufacturer claims this
is "100% impossible". We removed the relay from the circuit, and the Sunny
Boy is again operational.
- On arrival I found the Magnum display showing a "Low Battery Charge"
message with the bank measuring ~4Vdc. The individual batteries were in
various states of charge, ranging from high of 6.3v to low of -2.6v. These
measurements were taken at rest, all battery cables disconnected, and yes
three of the batts were registering a negative voltage.
- Customer reports that he was not aware of any recent prolonged power
outages.

The three potential suspects would seem to be:
- SS relay: The customer is convinced that this is the weak link in the
system and somehow triggered this failure. I am not so convinced but would
be interested to hear recommendations for properly testing its
functionality.
- Magnum equipment: Since there is low-battery-cutout protection, why would
this feature not have activated and prevented the batteries from draining
so low?
- Batteries: I am not very familiar with modes of failure, but our
distributor suggested that an internal short could be a possibility - what
might have triggered this?

Clearly I am fishing for potential leads here, so any suggestions are
welcome.

Thanks!
--
Corey Shalanski
Joule Energy
New Orleans, LA
ᐧ
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: 
http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

[RE-wrenches] J-Box Damage

[Corey Shalanski]

Wrenches,

I have a bit of a CSI-challenge for the group. Please see attached photo.

These are the details as provided to me:
The junction box shown in the photo is from a set of 18 modules that were
installed (for about 3-4 years) and then removed for re-roofing purposes.
Our company did not install the original array; we were called in for the
reinstallation. As soon as our technicians removed the modules from their
storage container and exposed them to sunlight, they started smelling
burning electronics. They opened at least one other junction box and found
similarly charred components. They measured zero voltage on these and at
least "a half dozen more". Some of the modules from this set had no intact
MC4 connectors; apparently they had been cut off to make removing the
modules easier (?!)

The project integrator is seeking a *plausible* explanation so that he can
decide how to move forward - essentially, what could have caused this?

Thank you for any ideas the group can offer :)

--
Corey Shalanski
Joule Energy
New Orleans, LA
ᐧ
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: 
http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

[RE-wrenches] Interconnection with Generator

[Corey Shalanski]

Wrenches,

We frequently encounter residences with backup generators. The question
that arises: how should the PV system be interconnected?

I have searched the archives and found some good information about this
subject, but nothing definitive. I have fallen into the habit of broadly
proclaiming that the PV system *must* be interconnected on the "utility"
side of the transfer switch - in order to prevent backfeeding into the
generator and thereby eliminate unintentional equipment damage. Is this
concern justified? If so, should this be an absolute rule or would it
depend on the generator make/model?

Thanks for any insights.

--
Corey Shalanski
Joule Energy
New Orleans, LA
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: 
http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

Re: [RE-wrenches] Diode Failure

[Corey Shalanski]

Wrenches,

Since my previous post (see below) we have recovered the faulty modules and
are now looking to replace the diodes in order to make them functional
again. I have had no success sourcing replacement diodes from the original
module manufacturer, Mage Solar.

Can anyone recommend a source for replacement diodes?

--
Corey Shalanski
Joule Solar
New Orleans, LA

ᐧ
On Tue, Aug 5, 2014 at 10:27 AM, 
 wrote:

>
> Message: 10
> Date: Tue, 5 Aug 2014 09:03:09 -0500
> From: Corey Shalanski 
> To: RE-wrenches@lists.re-wrenches.org
> Subject: [RE-wrenches] Diode Failure
> Message-ID:
> <
> ca+smqz1c7kszuqnvzqr0mmux3f2dt6ydum40iseczr2ejrg...@mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Wrenches,
>
> We recently were contacted by a customer who reported a lightning strike
> close to his house. His online monitoring revealed that 30 of 35
> microinverters simultaneously stopped producing power. On initial visit to
> the jobsite we measured Voc on many modules - either 12V or 24V instead of
> rated 36V. On a second visit we discovered that bypass diodes - either 1
> or
> 2 corresponding to observed voltage loss - had failed on each of the faulty
> modules.
>
> My question is: Can anyone support the theory that a nearby lightning
>  flash
> can cause mass bypass diode failure?
>
> --
> Corey Shalanski
> Joule Energy
> New Orleans, LA
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: 
http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

[RE-wrenches] Multi-Plane Modeling

[Corey Shalanski]

Wrenches,

We are wondering about the effects of installing a dual plane system
(East-West being the worst case scenario) on a single MPPT inverter versus
one with dual MPPT. Does anyone know of a modeling tool that allows for
this? Does anyone have any actual production data that might offer a sense
of how much less energy production to expect with a single MPPT?

We are also wondering about the impact of adding optimizers to a
multi-plane roof system. Many of our competitors are currently marketing
optimizers as "the next best thing", and so we would like to be able to
either recommend or discourage optimizers based on some solid ground. How
do others make the decision about whether or not to include optimizers on a
project?

--
Corey Shalanski
Joule Energy
New Orleans, LA
ᐧ
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: 
http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

[RE-wrenches] Diode Failure

[Corey Shalanski]

Wrenches,

We recently were contacted by a customer who reported a lightning strike
close to his house. His online monitoring revealed that 30 of 35
microinverters simultaneously stopped producing power. On initial visit to
the jobsite we measured Voc on many modules - either 12V or 24V instead of
rated 36V. On a second visit we discovered that bypass diodes - either 1 or
2 corresponding to observed voltage loss - had failed on each of the faulty
modules.

My question is: Can anyone support the theory that a nearby lightning flash
can cause mass bypass diode failure?

--
Corey Shalanski
Joule Energy
New Orleans, LA
ᐧ
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: 
http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

Re: [RE-wrenches] Concentrics at 250 volts plus

[Corey Shalanski]

Related question: How should we treat circuits that are less than 250V?
Does the EMT need to be bonded at EITHER end?

Some of our local inspectors are requiring bonding around all
concentric/eccentric knockouts, regardless of circuit voltage.

--
Corey Shalanski
Joule Energy
New Orleans, LA
ᐧ


On Tue, Jul 15, 2014 at 12:45 PM,  wrote:

>
> Message: 3
> Date: Mon, 14 Jul 2014 15:11:44 -0700
> From: William Miller 
> To: RE-wrenches 
> Subject: [RE-wrenches] Concentrics at 250 volts plus
> Message-ID: <52645f97-f231-4149-a8fd-d2e44e315...@millersolar.com>
> Content-Type: text/plain;   charset=us-ascii
>
> Friends:
>
> Please help us settle a crew debate before we come to blows:  for circuits
> 250 volts and higher, do we need to bond EMT at both ends?  Or, if there is
> bonded cabinet with a concentric on one end and a solid, bonded metal
> cabinet on the other, do we need a bonding bushing on the concentric end?
>
> I say a conduit needs to be bonded only on one end. My misguided employee
> says both ends. Both cabinets are independently bonded.
>
> Thanks in advance.
>
> William
> Miller Solar
>
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: 
http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

Re: [RE-wrenches] Combining Multiple Inverters

[Corey Shalanski]

Wrenches,

We have reevaluated our approach to combining multiple inverters and have
settled on a SqD HOM612L100RB as a suitable solution - it is readily
available from our local supply house for ~$25 and accommodates up to three
full-size 2-pole breakers.

What - if any - labels do you install on these panels: "AC (Solar) Combiner
Panel"? 705.12(D)(4)? Other recommendations?

Thanks.

--
Corey Shalanski
Joule Energy
New Orleans, LA
ᐧ


On Fri, Jun 27, 2014 at 12:41 PM,  wrote:

>
> Message: 6
> Date: Fri, 27 Jun 2014 12:41:52 -0400
> From: Jason Szumlanski 
> To: RE-wrenches 
> Subject: Re: [RE-wrenches] Combining Multiple Inverters
> Message-ID:
> <
> cajjtg3qzaxb-ugkkotupptd81ncnxv0uzid_frjfap5jo4f...@mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Dave,
>
> I looked at the BR24L70RP a while back. It's really a 2-space, 4 cuircuit
> panel. I think my conclusion was you actually need a single quadplex
> breaker with common trip center and outer breakers to get (2) 2-pole
> breaker functionality. The quadplex breakers come in a variety of mixed
> rating (i.e. 15A center and 20A outer breakers). They are not readily
> stocked and not cheap. We stuck with Sq D QO load centers for that reason.
>
> Am I missing something?
>
>
> Jason Szumlanski
>
> ?Fafco Solar?
>
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: 
http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

Re: [RE-wrenches] Combining Multiple Inverters

[Corey Shalanski]

Thank you to all who responded to this thread - particularly Jason/Dave/Jay
for pointing out the maximum OCPD requirements.

Getting back to my original question.. I would like to use Dave's
"extremely small subset" example of two SB5s operating at 277V. In this
case, if we were to parallel the output of each inverter onto a 50A OCPD
(#6 wire), could we downsize the wire to #10 from the split going back to
each individual inverter? or would we be better served (required?) to run
#6 all the way back to each unit? Since we are dealing with current-limited
devices I would tend to think we can downsize but wanted to get Wrenches'
feedback on this.

--
Corey Shalanski
Joule Energy
New Orleans, LA
ᐧ


On Fri, Jun 27, 2014 at 12:41 PM,  wrote:
>
>
> Message: 5
> Date: Fri, 27 Jun 2014 11:32:02 -0400
> From: Dave Click 
> To: re-wrenches@lists.re-wrenches.org
> Subject: Re: [RE-wrenches] Combining Multiple Inverters
> Message-ID: <53ad8e72.4080...@fsec.ucf.edu>
> Content-Type: text/plain; format=flowed; charset=ISO-8859-1
>
> This is an interesting conversation, but I'm not sure it's going to
> really impact anything.
>
> When an inverter is listed, it is tested with some "maximum output
> overcurrent protection" as part of its rating per UL 1741. Typically
> inverter manufacturers set this to be just above the inverter's max
> current + 25%. As you know, many inverters can work at more than one
> voltage, so for the SB5s their max current ratings at 277/240/208V are
> 18/20.8/24A, respectively. The max overcurrent protection is 50A. This
> figure often appears in the manual but not in the data sheet. For SMA,
> it's in the manuals. For some manufacturers, it's only available from
> tech support.
>
> For the Sunny Boy line, the only way you could have more than one
> inverter on a shared OCPD is if you have two SB5s operating at 277V
> (18.1A rated current each, so 2x18.1x1.25 < 50A). The SB6, SB7, and SB8
> all have currents too high to make this work, as they share the 50A max
> OCPD. The SB3/3.8/4 have a max OCPD of 30A, which is too low to
> double-up since each SB3 requires an OCPD of at least 20A. The TLs don't
> work either, as the max for any unit is too low. I don't see it in the
> SMA manual, but I know that in other manuals I've seen a manufacturer
> requirement for a dedicated OCPD. The only inverters I know of that have
> a max OCPD rating far beyond their rated current are micro-inverters.
>
> As for the shared disconnect, since at least the 2005, 690.15 has noted,
> "A single disconnecting means in accordance with 690.17 shall be
> permitted for the combined ac output of one or more inverters or ac
> modules in an interactive system." That being said, the NEC requires ac
> modules and micro-inverters to have ac disconnects (connectors,
> typically) per 690.6 and 690.15(A). 690.15 notes that an inverter be
> able to be disconnected from all sources, but if doubling up these SB5s
> you could argue that this shared disconnect accomplishes that via the
> anti-islanding protection... so I agree now that this is a grey area.
>
> Anyway, it comes down to whether it's worth worrying about this for what
> is an extremely small subset of compatible inverter configurations, when
> you can just do something like install a $50 Eaton BR24L70RP (70A bus,
> 240V, 4 spaces) with two 30A breakers and be on your way.
>
> DKC
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: 
http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

Re: [RE-wrenches] Combining Multiple Inverters

[Corey Shalanski]

ᐧ
We considered the necessity to shut down individual inverters and
determined that the added costs of an inverter output combiner panel were
not merited. I agree that in theory it seems beneficial to be able to
switch each inverter individually, but how often does this occur in
practice? For the relatively infrequent cases where we need to return to a
jobsite and shut down an inverter - for troubleshooting/removal/etc. - we
do not mind shutting down the other inverters (up to a limit) for what is
hopefully a short period of time.

Again, this whole line of reasoning may be shown to be faulty if someone
can directly point to the Code section that requires OCPD on each
individual inverter.

--
Corey


On Thu, Jun 26, 2014 at 9:20 AM, 
 wrote:

>
> Message: 5
> Date: Wed, 25 Jun 2014 19:17:57 -0700
> From: William Miller 
> To: RE-wrenches 
> Subject: Re: [RE-wrenches] Combining Multiple Inverters
> Message-ID: <04f4b8fd-e280-4bf2-b5a4-c2fca8d1c...@millersolar.com>
> Content-Type: text/plain; charset="utf-8"
>
> Not allowed. You need a dedicated OCPD. Plus seems like a really bad idea.
>  How do you shut down just one inverter?
>
>
>
> Miller Solar
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: 
http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

Re: [RE-wrenches] Combining Multiple Inverters

[Corey Shalanski]

ᐧ
Perhaps I should've been more specific with my scenario. I was imagining a
supply side connection, as this would more commonly be the case when
combining multiple inverters. In this case it seems like the provisions of
705.12(D) for load side conections don't even apply, no? Rather 705.12(A)
becomes the relevant section, and I see very few restrictions there.

Even with a load side connection I would tend to agree with Jason's
interpretation: Does the "source interconnection" in 705.12(D)(1) refer to
each individual inverter, or can it refer to an aggregated "source"?

I am interested in pursuing this idea, mainly to understand how/where the
NEC forbids it. In lieu of a clear Code reference against it, how is this
any different from a branch circuit (in reverse)? ie, as with
microinverters.

--
Corey Shalanski
Joule Energy
New Orleans, LA

On Thu, Jun 26, 2014 at 9:20 AM, 
 wrote:

>
> Message: 11
> Date: Thu, 26 Jun 2014 09:10:07 -0400
> From: Jason Szumlanski 
> To: RE-wrenches 
> Subject: Re: [RE-wrenches] Combining Multiple Inverters
> Message-ID:
> <
> cajjtg3oqgblzatinuhfp_ghivzyd6dldslankc1ofg9tr1r...@mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> 705.12(D) reads, "... the interconnection provisions for the
> utility-interactive inverter(s) shall comply with (D)(1) through (D)(7)."
> That's inverters - plural. The interconnection must be protected by
> dedicated OCPD, not each inverter individually. Microinverters comply
> because of this interpretation.
>
> That said, I've never done it. An accumulator panel is pretty cost
> effective when you consider the alternative cost of an enclosure and the
> Polaris connectors. I guess if you are making the Polaris connections
> inside the main load center or inside an inverter you can eliminate the
> cost of a dedicated enclosure. There would be some material and labor
> savings.
>
> ?If the inverter has a maximum OCPD rating, you will be limited by that.
> ?Microinverters "get around" that by the wire and inverter being
> sized/rated for the entire maximum string.
>
> Jason Szumlanski
>
> ?Fafco Solar?
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: 
http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

Re: [RE-wrenches] RE-wrenches Digest, Vol 7, Issue 245

[Corey Shalanski]

We considered the necessity to shut down individual inverters and
determined that the added costs of an inverter output combiner panel were
not merited. I agree that in theory it seems beneficial to be able to
switch each inverter individually, but how often does this occur in
practice? For the relatively infrequent cases where we need to return to a
jobsite and shut down an inverter - for troubleshooting/removal/etc. - we
do not mind shutting down the other inverters (up to a limit) for what is
hopefully a short period of time.

Again, this whole line of reasoning may be shown to be faulty if someone
can directly point to the Code section that requires OCPD on each
individual inverter.

--
Corey
ᐧ


On Thu, Jun 26, 2014 at 9:20 AM, 
wrote:

>
> Message: 5
> Date: Wed, 25 Jun 2014 19:17:57 -0700
> From: William Miller 
> To: RE-wrenches 
> Subject: Re: [RE-wrenches] Combining Multiple Inverters
> Message-ID: <04f4b8fd-e280-4bf2-b5a4-c2fca8d1c...@millersolar.com>
> Content-Type: text/plain; charset="utf-8"
>
> Not allowed. You need a dedicated OCPD. Plus seems like a really bad idea.
>  How do you shut down just one inverter?
>
>
>
> Miller Solar
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: 
http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

[RE-wrenches] Combining Multiple Inverters

[Corey Shalanski]

I am curious about best practices for combining the output of multiple
inverters:

   - We are considering using an insulated tap "Polaris/Burndy" connector
   in lieu of a solar accumulation panel. We would then run the output of this
   tap connector through a fused disconnect and on to the interconnection.
   Does anyone else do this?
   - In the above scenario, how should we size the wire between each
   inverter's output and the tap connector? Since there is no OCPD on this
   wire, would we have to use the same wire gauge as the combined output? or
   can we get away with sizing each wire according to its associated inverter
   output rating?

--
Corey Shalanski
Joule Energy
New Orleans, LA
ᐧ
___
List sponsored by Redwood Alliance

List Address: RE-wrenches@lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: 
http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

Re: [RE-wrenches] Capacitive Discharge Test Results

[Corey Shalanski]

As a follow up to my earlier post, I am wondering what brand/model other
wrenches are using to conduct megger tests?

Can you recommend a good "starter" unit?

--
Corey Shalanski
Joule Energy
New Orleans, LA
ᐧ
___
List sponsored by Home Power magazine

List Address: RE-wrenches@lists.re-wrenches.org

Change email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out participant bios:
www.members.re-wrenches.org

[RE-wrenches] Capacitive Discharge Test Results

[Corey Shalanski]

Fellow Wrenches,

We recently commissioned a 220kW rooftop PV system and are having some
inverter malfunction issues. The system details are as follows:
- Inverters: Power One Aurora Trio-27.6 (x7)
- Modules: Stion STN-130 (x1690)
- Array: Strings of 14-16 modules each, 8 strings per combiner, 1 combiner
per MPPT input

It has been less than two months since we commissioned the system, and we
have already seen five of the inverters malfunction. While troubleshooting
these issues the inverter manufacturer had me measure positive-to-ground
and negative-to-ground voltage readings. At the inverter level I measured
instantaneous voltages of 100-200V before seeing a bleedoff; at the string
level the voltages were 10-20V before bleedoff.

The inverter manufacturer is concerned with the magnitude (~200V) of this
instantaneous voltage and also the delay in bleeding off to zero - after
about five seconds the voltage level was still approximately 50V (but still
dropping). The manufacturer is claiming that this residual voltage should
drop to zero much more rapidly AND the presence of such a delayed bleedoff
indicates significant "leakage" coming from the array.They are further
claiming that this leakage is responsible for the damage to the inverters.
They suggested using a megger to test insulation resistance throughout the
installation.

My questions to the group:
- Is there any truth in the inverter manufacturer's claims?
- Do my field measurements seem out of range from what others are seeing
with ungrounded arrays?

Thanks for any information you can provide.
--
Corey Shalanski
Joule Energy
New Orleans, LA
ᐧ
___
List sponsored by Home Power magazine

List Address: RE-wrenches@lists.re-wrenches.org

Change email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out participant bios:
www.members.re-wrenches.org

[RE-wrenches] EGC for Multiple Inverters

[Corey Shalanski]

Wondering about the following general scenario: multiple-inverter systems
in which all PV output circuits (perhaps from different roof
planes/subarrays) are run through a common conduit into a j-box/gutter and
then split off to separate inverters.
- Can we get away with combining EGCs from all subarrays into a single
"trunk" EGC inside the common conduit before re-splitting into individual
EGCs for each inverter? How would this combined EGC be sized?
- Is there any logic to running one continuous EGC from each subarray to
its associated inverter? i.e. for troubleshooting ground faults, etc? How
would this method accommodate multiple subarrays feeding a single inverter
(that may only allow one EGC input)?

We have always stuck with the "trunk" method, but just curious about what
best practices others are using.

--
Corey Shalanski
Joule Energy
New Orleans, LA
___
List sponsored by Home Power magazine

List Address: RE-wrenches@lists.re-wrenches.org

Change email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out participant bios:
www.members.re-wrenches.org

Re: [RE-wrenches] Outback AC coupling Sunpower?

[Corey Shalanski]

Mac,

We have installed about ten AC coupled Magnum systems over the past year.

Overcharge protection is accomplished by frequency shift, but Magnum
recommends an auxiliary form of battery management. The cheapest way to do
this is to program the relay driver on the Magnum advanced remote control
(ARC) to open/close a solid state relay at specified battery voltage
setpoints - similar to what Kelly mentioned. Unfortunately the "cheapest
way" sometimes comes back to haunt us in the form of unanticipated extra
costs. We had two customer callbacks indicating their inverter had
mysteriously shut down - site visit revealed a fried relay in each case..
so I would recommend at least investing in a good quality relay if you
choose this route.

One other thing we have learned is that not all grid interactive inverters
are compatible with the Magnum inverters. Specifically Power One Aurora
string inverters cannot seem to synchronize in off-grid mode - we have had
to switch out Auroras on two projects because of this. We have had no such
synchronization issues with SMA inverters so far.

--
Corey Shalanski
Joule Energy
New Orleans, LA



On Wed, Jul 31, 2013 Mac Lewis  wrote:
>
>
> Here is a paper on AC coupling the magnum.
>
> http://www.wholesalesolar.com/pdf.folder/inverter%20pdf%20folder/MagnumACcoupling.pdf
>
> The key is to connect the AC input terminals on the Magnum to the main
> panel (or a panel closer to the utility feed) and then feed the utility
> interactive inverter to a subpanel that is connected to the AC output
> terminals on the Magnum.  Under normal operation, the Magnum passes the
> power through and the utility interactive inverter is connected to the
> grid.  If the grid goes down, the internal relays isolate the Magnum and
> the critical load panel from the grid and the Magnum starts to make a sine
> wave that the UI inverter will export power to.
>
> You have to keep the critical load panel amperage below the pass through
> rating on the internal relays on the Magnum, and the grid connected
> inverter needs to have a lower output than the Magnum (I think by 10%).
>  Also, I'm not sure if the diversion controller Magnum has been working on
> is out yet or not.
>
> I've never done this, but I am about to.  Any wrenches have experience
> doing an AC coupled magnum?
>
___
List sponsored by Home Power magazine

List Address: RE-wrenches@lists.re-wrenches.org

Change email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out participant bios:
www.members.re-wrenches.org

[RE-wrenches] Warehouse Inventory

[Corey Shalanski]

I work for a burgeoning design/install company, and we are looking to
upgrade out method of taking inventory.

Currently we do a clean sweep once a month and provide numbers to our
accountant, but we would ultimately like to have a digitized real-time
inventory tracking solution.

We are not opposed to investing in the appropriate technology but would
also be open to creative solutions (smartphones + QR codes?).. What methods
or tools have Wrenches used to reliably keep track of inventory?

--
Corey Shalanski
Joule Energy
New Orleans, LA
___
List sponsored by Home Power magazine

List Address: RE-wrenches@lists.re-wrenches.org

Change email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out participant bios:
www.members.re-wrenches.org

Re: [RE-wrenches] RE-wrenches Digest, Vol 6, Issue 276

[Corey Shalanski]

Our local inspector is allowing sticker-type labels, so we have begun
printing our own with a laser printer. We found "weatherproof" sheets
available in a variety of size configurations:
http://www.onlinelabels.com/material_polyester_laser_labels.htm

After about six months of testing they seem to be adhering alright to most
surfaces, but we can't seem to get anything - including trophy plaques - to
stick to SMA inverter cabinets (or any surface with a "grainy" texture)
without using some sort of super glue. I'd be interested to hear from
anyone who's found a successful method or product for this application.

--
Corey Shalanski
Joule Energy
New Orleans, LA


On Wed, Jul 17, 2013 at 2:50 PM, Bob Ellison  wrote:
>
>
> If you're using a P touch there are labels with adhesives available that
> are non-removable and stick on real well
> The regular labels will unpeel at some point
> The nonremovable ones don't unpeel their labels and hold their colors very
> well especially inside a box
>
> Opening a box and finding five labels laying on the bottom isn't pleasant!
>
___
List sponsored by Home Power magazine

List Address: RE-wrenches@lists.re-wrenches.org

Change email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out participant bios:
www.members.re-wrenches.org

[RE-wrenches] Solar Thermal Question - ICS

[Corey Shalanski]

Quick question for the thermal wrenches out there:

I am sourcing ICS "batch" units and wondering what is currently available.
My research shows the following:
- SunEarth "CopperHeart" <http://sunearthinc.com/systems/copperheart/> still
available
- Integrated Solar
"CopperSun"<http://www.integratedsolar.com/coppersun.shtml#coppersunsolar>still
available
- TCT Solar "ProgressivTube" no longer available

Can anyone provide more information?

--
Corey Shalanski
Joule Energy
New Orleans, LA
___
List sponsored by Home Power magazine

List Address: RE-wrenches@lists.re-wrenches.org

Change email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out participant bios:
www.members.re-wrenches.org

[RE-wrenches] Input Current Imbalance

[Corey Shalanski]

Wrenches,

I recently noticed something that seems to defy one of my basic
understandings of electrical circuit theory:

Single string input at inverter. Clear skies, full sunlight. With inverter
turned on my clamp meter reads (for example) 5A on positive conductor and
4A on negative conductor.


I've always assumed that the current should be equal at every point in the
circuit.

I've noticed this "imbalance" on several different inverter brands. Has
anyone else ever observed this? Can someone offer an explanation for this
and satisfy my curiosity?

--
Corey Shalanski
Joule Energy
New Orleans, LA
___
List sponsored by Home Power magazine

List Address: RE-wrenches@lists.re-wrenches.org

Change email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out participant bios:
www.members.re-wrenches.org

[RE-wrenches] 690.31(E)(1)

[Corey Shalanski]

Wrenches,

I am curious how others are meeting the "Beneath Roofs" requirement for the
2011 Code.

In order to locate wiring/conduit at least 10" beneath the roof decking, I
would tend to hang some 2x4 blocks off rafters and just attach straps to
that. But I am wondering if anyone has any preferred ways to achieve this.

Thanks.
--
Corey Shalanski
Joule Energy
New Orleans, LA
___
List sponsored by Home Power magazine

List Address: RE-wrenches@lists.re-wrenches.org

Change email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out participant bios:
www.members.re-wrenches.org

Re: [RE-wrenches] Enphase / Inverter failures

[Corey Shalanski]

I would be interested in hearing about other wrenches' observed Enphase
failure rates.

Since 2010 we've installed 1347 total Enphase units with an overall failure
rate of 3.27%

Our breakdown is as follows:

   - M190 - 19/362 = 5.25% failed
   - M210 - 21/545 = 3.85% failed
   - D380 - 3/101 = 2.97% failed
   - M215 - 1/339 = 0.29% failed

--
Corey Shalanski
Joule Energy
New Orleans, LA
___
List sponsored by Home Power magazine

List Address: RE-wrenches@lists.re-wrenches.org

Change email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out participant bios:
www.members.re-wrenches.org

[RE-wrenches] Cleaning Modules

[Corey Shalanski]

Greetings Wrenches,

I am wondering if anyone can offer tried-and-true tips for cleaning
modules: tools, materials, methods?

--
Corey Shalanski
Joule Energy <http://joule-energy.com/>
New Orleans, LA
___
List sponsored by Home Power magazine

List Address: RE-wrenches@lists.re-wrenches.org

Change email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out participant bios:
www.members.re-wrenches.org

[RE-wrenches] Metal Shingles

[Corey Shalanski]

I did a site survey today for a customer who has metal shingle roofing. The
shingles are made from a thin-gauge metal and are stamped to look like
cedar shakes. The homeowner was unsure about the manufacturer - they appear
similar to Future Roof or EDCO ArrowLine.

I am wondering about:
1) attachment solutions - flashed products (QuickMount PV) do not seem to
be an option.
2) installation methods - the shingles dent easily and permanently under
pressure, so we will want to contact the roof as minimally as possible.

Thanks for any suggestions.

--
Corey Shalanski
Joule Energy
New Orleans, LA
___
List sponsored by Home Power magazine

List Address: RE-wrenches@lists.re-wrenches.org

Options & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out participant bios:
www.members.re-wrenches.org

[RE-wrenches] Critical Loads Panel Wiring

[Corey Shalanski]

Wrenches,

Batt backup system: When placing a critical loads panel directly adjacent
to the main service panel (in the next stud bay), must the neutral and
ground conductors be pulled into the new subpanel? or can only the hots be
pulled? Any Code references would be appreciated.

--
Corey Shalanski
Joule Energy
New Orleans, LA
___
List sponsored by Home Power magazine

List Address: RE-wrenches@lists.re-wrenches.org

Options & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out participant bios:
www.members.re-wrenches.org

[RE-wrenches] Solar Modules vs. Solar Flares

[Corey Shalanski]

Greetings Wrenches,

I am a new member and have been listening in for the past couple months,
very grateful to have found this amazing resource. Big Up to all involved!

We have a doomsday-driven customer who is apparently concerned that next
year the sun will wipe out the very devices intended to harvest its energy.
I have pasted a portion of his message below:

"A NOVA special on PBS this evening indicated that the sun is entering
a phase of maximum activity, peaking in 2013, that could include coronal
mass ejections which could damage not only various components in the power
grid, but also most modern electronics in cars, cell phones, etc. My solar
powered back-up system is supposed to provide back-up power in the event of
loss of the power grid. Has any consideration been given to the effect of
solar flares or electro-magnetic pulse effects on solar panels, charge
controllers, inverters and associated components? I assume that the
batteries themselves would be relatively unaffected, and that the inverter
would probably be at highest risk for damage either from a surge from the
power grid or from damage to IC chips from an electromagnetic pulse. Are
the individual solar panels particularly susceptible to such damage? Since
the charge controllers and inverter are housed in metal boxes, are they
essentially the same as Faraday cages, protecting the components contained
inside of their respective boxes?
I realize that a sufficiently strong electromagnetic pulse,
whether man-made or from the sun, will probably fry most electronic
devices. But I would consider spending a bit more if additional hardware,
not contemplated in the current contract, might provide some additional
measure of protection."

I am wondering if anyone on the list has information on the potential
effects of increased solar activity on PV equipment. How would you respond
to this customer's concerns?

-- 
Corey Shalanski
Joule Energy
New Orleans, LA
___
List sponsored by Home Power magazine

List Address: RE-wrenches@lists.re-wrenches.org

Options & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out participant bios:
www.members.re-wrenches.org