Re: [RE-wrenches] Simpliphi Phi 3.8 48V Case Color

[Lloyd Hoffstatter via RE-wrenches]

Hi Jason,

It looks like all the black casings are 12 or 24 Volt.

White 3.8kW @ 48V nom. are either AmpliPhi (with comms.) or SimpliPhi without. 
They can't be mixed.

Not sure of the maximum number, but UL 9540 listing up to 3 x BOSS.12 with 12 
batteries each.

Best regards,
Lloyd


Lloyd Hoffstatter, M.S. Applied Solar Energy

Director, Sunstruck Consulting

ll...@sunstruckconsulting.com<mailto:ll...@sunstruckconsulting.com>

845-657-8132 (office)

914-844-3404 (cell)




From: RE-wrenches  on behalf of 
Jason Szumlanski via RE-wrenches 
Sent: Wednesday, May 29, 2024 7:14 AM
To: RE-wrenches 
Cc: Jason Szumlanski 
Subject: [RE-wrenches] Simpliphi Phi 3.8 48V Case Color

Is there a difference in the batteries in a white case vs. black case? Are they 
compatible in terms of paralleling them?

Secondary question - I can't find the maximum number of these batteries in 
parallel. Is anyone aware of the capacity limit?


Jason Szumlanski
Florida Solar Design Group



BOSS.12 ul-9540-atm-with-model-number-detail.pdf
Description: BOSS.12 ul-9540-atm-with-model-number-detail.pdf
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Re: [RE-wrenches] Minimum bus size, new requirements

[Lloyd Hoffstatter via RE-wrenches]

William,

Here is the CA Energy Code with the upsized busbar requirements under solar / 
ess readiness:

https://title24energyreports.com/articles/basic-facts-changes-2022-energy-code.php

Best regard
Title 24: 2022 Energy Code - Basic Facts | 
CompuCalc<https://title24energyreports.com/articles/basic-facts-changes-2022-energy-code.php>
Summary of changes and updates in the 2022 California Energy Code
title24energyreports.com



Lloyd Hoffstatter, M.S. Applied Solar Energy

Inaugural NABCEP Cetrified PV Installer Emeritus

Director, Sunstruck Consulting

ll...@sunstruckconsulting.com<mailto:ll...@sunstruckconsulting.com>

845-657-8132 (office)

914-844-3404 (cell)




From: RE-wrenches  on behalf of 
William Miller via RE-wrenches 
Sent: Thursday, March 28, 2024 1:00 PM
To: RE-wrenches 
Cc: William Miller 
Subject: [RE-wrenches] Minimum bus size, new requirements


Friends:



A local building official recently wrote this:



This is to comply with the new codes (California Energy Code and the Nation 
Electric Code) that require this minimum buss rating regardless of the service 
size or main size.



The new code allegedly requires a minimum bus rating of 225A in all new 
services of 200A rating or less.



Do any of you know what new code this might be?



Thanks in advance for your time.



William



Miller Solar

17395 Oak Road, Atascadero, CA 93422

805-438-5600

www.millersolar.com<https://urldefense.proofpoint.com/v2/url?u=http-3A__www.millersolar.com_=DwMFaQ=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM=p2tHyHEAjVe2zSh4C_236V4KkHnn0z0ynUvWz0mobds=9uejohzp8xlaOjgzFRzK5pSkQX5Jtrq-KM0zg-kn9sGvQF-Ezmo9hA2K0hbNA1ns=7RIp61FIGVkUrnLeJuaaLlwwPwqGeMEQXVgB04GNECk=>

CA Lic. 773985




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Re: [RE-wrenches] Minimum bus size, new requirements

[Lloyd Hoffstatter via RE-wrenches]

Hi William,

200 Amp service per CA Energy Code -

https://www.energy.ca.gov/sites/default/files/2022-08/2022_Residential_Mandatory_Measures_Summary_ADA.pdf

It may have been modified since.

Best regards,
Lloyd


Lloyd Hoffstatter, M.S. Applied Solar Energy

Inaugural NABCEP Cetrified PV Installer Emeritus

Director, Sunstruck Consulting

ll...@sunstruckconsulting.com<mailto:ll...@sunstruckconsulting.com>

845-657-8132 (office)

914-844-3404 (cell)




From: RE-wrenches  on behalf of 
William Miller via RE-wrenches 
Sent: Thursday, March 28, 2024 1:00 PM
To: RE-wrenches 
Cc: William Miller 
Subject: [RE-wrenches] Minimum bus size, new requirements


Friends:



A local building official recently wrote this:



This is to comply with the new codes (California Energy Code and the Nation 
Electric Code) that require this minimum buss rating regardless of the service 
size or main size.



The new code allegedly requires a minimum bus rating of 225A in all new 
services of 200A rating or less.



Do any of you know what new code this might be?



Thanks in advance for your time.



William



Miller Solar

17395 Oak Road, Atascadero, CA 93422

805-438-5600

www.millersolar.com<https://urldefense.proofpoint.com/v2/url?u=http-3A__www.millersolar.com_=DwMFaQ=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM=p2tHyHEAjVe2zSh4C_236V4KkHnn0z0ynUvWz0mobds=9uejohzp8xlaOjgzFRzK5pSkQX5Jtrq-KM0zg-kn9sGvQF-Ezmo9hA2K0hbNA1ns=7RIp61FIGVkUrnLeJuaaLlwwPwqGeMEQXVgB04GNECk=>

CA Lic. 773985




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Re: [RE-wrenches] Hawaii projects

[Lloyd Hoffstatter via RE-wrenches]

HI Max,

One possibility:


Roland Shackelford

President / Owner

NABCEP PVIP #091209-162

O 808.775.7410 | M 808.938.9239 |

45-487 Lehua St Honokaa, HI 96727

Power Solutions for Generations Renewable Energy Services, 
Inc.<https://www.renewablenergy.com/>
Best regards,
Lloyd

Lloyd Hoffstatter, M.S. Applied Solar Energy
NABCEP Inaugural Certified PV Installer Emeritus
Director, Sunstruck Consulting
ll...@sunstruckconsulting.com<mailto:ll...@sunstruckconsulting.com>
845-657-8132 (office)
914-844-3404 (mobile)

From: Max Balchowsky via RE-wrenches<mailto:re-wrenches@lists.re-wrenches.org>
Sent: Friday, November 3, 2023 9:23 PM
To: RE-wrenches<mailto:re-wrenches@lists.re-wrenches.org>
Cc: Max Balchowsky<mailto:m...@seesolar.com>
Subject: [RE-wrenches] Hawaii projects

Hi wrenches, i spoke with someone in Hawaii awhile back and i can’t find my 
notes or the email. I have a couple of projects on kauai coming up and need to 
speak with an installer over there.

Thanks,
Max Balchowsky
SEE Systems
760-403-6810

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Re: [RE-wrenches] Parallel Homegrid Stack'd Busbar

[Lloyd Hoffstatter via RE-wrenches]

Hi Maverick,

Per tech support, you need to buss battery output(s) to both input breakers to 
get the full 275 Amp output.

Best regards,
Lloyd

Lloyd Hoffstatter, M.S. Applied Solar Energy
NABCEP Inaugural Certified PV Installer Emeritus
Director, Sunstruck Consulting
ll...@sunstruckconsulting.com<mailto:ll...@sunstruckconsulting.com>
845-657-8132 (office)
914-844-3404 (mobile)

From: Mac Lewis via RE-wrenches<mailto:re-wrenches@lists.re-wrenches.org>
Sent: Thursday, June 29, 2023 8:27 AM
To: RE-wrenches<mailto:re-wrenches@lists.re-wrenches.org>
Cc: Mac Lewis<mailto:maclew...@gmail.com>
Subject: Re: [RE-wrenches] Parallel Homegrid Stack'd Busbar

Hi Jason,

The Sol-Ark 15k has dual battery input terminals so they can be combined right 
inside.  This could be a good option to consider.

Thanks


On Thu, Jun 29, 2023 at 6:17 AM Maverick Brown via RE-wrenches 
mailto:re-wrenches@lists.re-wrenches.org>> 
wrote:
I recommend the Victron Lynx Power In or the Lynx Distributor.
Thank you,

Maverick



On Jun 29, 2023, at 6:55 AM, Jason Szumlanski via RE-wrenches 
mailto:re-wrenches@lists.re-wrenches.org>> 
wrote:

Hi all,

I'm doing my first installation with two 24 kWh Homegrid stacks. They will feed 
two Sol-Ark 15k. I'm seeking recommendations on busbars for connecting this up 
in the most elegant way possible.

Pictures speak 1,000 words, so if you have any I would appreciate it (off-list 
is fine).

Jason Szumlanski
Florida Solar Design Group


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--



Mac Lewis

"Yo solo sé que no sé nada." -Sócrates

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Re: [RE-wrenches] Fire fighters

[Lloyd Hoffstatter via RE-wrenches]

Kris,
This UL testing report covers firefighting lighting on PV 
https://fsri.org/research-update/firefighter-safety-and-photovoltaic-systems-summary-released

Best regards,
Lloyd
Lloyd Hoffstatter
Sunstruck Consulting

Get Outlook for iOS<https://aka.ms/o0ukef>

From: RE-wrenches  on behalf of 
Kristopher Schmid via RE-wrenches 
Sent: Wednesday, March 8, 2023 10:31:24 AM
To: RE-wrenches 
Cc: Kristopher Schmid 
Subject: [RE-wrenches] Fire fighters

Hi wrenches,

In speaking to local firefighters last year, I had a question that stumped me.  
At night, will the light from the flames or the fire fighters' flood lights 
energize the array to a dangerous potential?

Any light you can shed (pun intended) would be most welcome.

Shine On!

Kris Schmid
Legacy Solar, LLC
137 West 1st Avenue
Luck, WI 54853
www.legacysolar.com<http://www.legacysolar.com>
715-653-4295
NABCEP Certified PV Installation Professional
Licensed Wisconsin Master Electrician
BSEE
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Re: [RE-wrenches] Inverter bypass

[Lloyd Hoffstatter via RE-wrenches]

https://www.zoro.com/square-d-cb-accessory-interlock-attachment-qou2dtila/i/G0840896/?utm_source=google_medium=surfaces_campaign=shopping%20feed_content=free%20google%20shopping%20clicks=CjwKCAiAr4GgBhBFEiwAgwORrQ7ciEpSjpyftUryryWGfWJ7kiFdpiRnJ1DZ3k9ifEZYYBQJ_KYULBoC9qQQAvD_BwE

Best regards,
Lloyd
Lloyd Hoffstatter
Sunstruck Consulting

Get Outlook for iOS<https://aka.ms/o0ukef>

From: RE-wrenches  on behalf of 
Kristopher Schmid via RE-wrenches 
Sent: Thursday, March 2, 2023 12:46:43 PM
To: RE-wrenches 
Cc: Kristopher Schmid 
Subject: [RE-wrenches] Inverter bypass

Hi All,

I have a stand alone system that was upgraded from an FX inverter to a Radian 
WITHOUT  the companion load center.  I would like to add an inverter bypass 
circuit to operate the house on generator power.  There used to be a 4 slot 
breaker panel (SqD?) with the rocker switch preventing both breakers from being 
in the on position simultaneously.  I have not been able to find it on the 
interweb.  Anyone know of something out there that would meet my needs?

Kris


Shine On!

Kris Schmid
Legacy Solar, LLC
137 West 1st Avenue
Luck, WI 54853
www.legacysolar.com<http://www.legacysolar.com>
715-653-4295
NABCEP Certified PV Installation Professional
Licensed Wisconsin Master Electrician
BSEE
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Re: [RE-wrenches] SMA SB and LiFe

[Lloyd Hoffstatter via RE-wrenches]

Hey Glenn,
I just started running a LIFEPO4 battery with a Sunny Island, no closed loop 
communication but with settings pretty much what Fortress
has on their Sunny Island sheet.  Settings are lower than what some LIFE’s 
specify, to avoid a voltage jump / high voltage error at the end of the charge 
cycle from what I’ve seen.

Best regards,
Lloyd

Lloyd Hoffstatter, M.S. Applied Solar Energy
NABCEP Inaugural Certified PV Installer Emeritus
Director, Sunstruck Consulting
ll...@sunstruckconsulting.com<mailto:ll...@sunstruckconsulting.com>
845-657-8132 (office)
914-844-3404 (mobile)

From: Glenn Burt via RE-wrenches<mailto:re-wrenches@lists.re-wrenches.org>
Sent: Monday, January 2, 2023 4:15 PM
To: RE-Wrenches<mailto:re-wrenches@lists.re-wrenches.org>
Cc: Glenn Burt<mailto:glenn.b...@glbcc.com>
Subject: [RE-wrenches] SMA SB and LiFe

Hello all – best wishes for the new year.

I have a client with an aging (dead) AGM (16x Concorde PVX-3050T) battery bank 
with two Sunny Island 5048 inverters (and a few SB in the mix too) in a GTWB 
configuration.
Has anyone successfully replaced an AGM battery bank with a LiFe ESS solution 
with closed loop comms and Sunny Islands?
Something like a Fortress eVault max?

Or should I simply replace the existing AGM’s with the same model batteries and 
let it go another 10 years?

Thanks for the feedback!
Glenn

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Re: [RE-wrenches] SMA inverterters with SPS

[Lloyd Hoffstatter via RE-wrenches]

Kirpal,
Just a reminder that SPS does not work (past day 1) with Rapid Shutdown.
Best regards,
Lloyd

Lloyd Hoffstatter, M.S. Applied Solar Energy
NABCEP Inaugural Certified PV Installer Emeritus
Director, Sunstruck Consulting
ll...@sunstruckconsulting.com<mailto:ll...@sunstruckconsulting.com>
845-657-8132 (office)
914-844-3404 (mobile)

From: Kirpal via RE-wrenches<mailto:re-wrenches@lists.re-wrenches.org>
Sent: Monday, December 12, 2022 10:24 AM
To: RE-wrenches<mailto:re-wrenches@lists.re-wrenches.org>
Cc: Kirpal<mailto:solarwo...@gmail.com>
Subject: [RE-wrenches] SMA inverterters with SPS

Good morning folks!
Been interesting to see that both SMA and Fronius inverters ar no longer 
available thru our normal distribution channels.  All their residential models 
seem to be unavailable with our distributors not having any idea on return to 
availability.  Anyone know why both of these string inverter options seem to 
have evaporatedare they gone for good?
WE have a client looking to do a system with 3 - 5kW inverters with the SPS.  
The SPS being the feature they are after.  Anyone have insight into this 
availability issue or know where to get some of those inverters? Mike Mahon?
Would appreciate any insight.

Thanks.
Sunny Regards,
Kirpal Khalsa
Oregon LRT#25
Oregon Solarworks LLC
www.oregonsolarworks.com<http://www.oregonsolarworks.com>
541-299-0402

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Re: [RE-wrenches] SolArk and Tigo compatibility

[Lloyd Hoffstatter via RE-wrenches]

Chris,
For emergency shutoff switch i just used a lock pushbotton switch in a clear 
front lockable box with an led to indicate status. We did use an external power 
supply because we were using Tigo optimizers, CCA and TAP.
Best regards,
Lloyd

Get Outlook for iOS

From: RE-wrenches  on behalf of 
Christopher Warfel via RE-wrenches 
Sent: Friday, November 18, 2022 10:14:52 AM
To: Bradley Bassett ; RE-wrenches 

Cc: Christopher Warfel 
Subject: Re: [RE-wrenches] SolArk and Tigo compatibility


Thanks everyone, the person I started with a SolArk asked me to call them, so 
I've left a message.  I'll let everyone know what the determination is.  
Bradley raises a good point about shutting down the back up loads panel. We 
would like to have an outdoor accessible disconnect switch between the back up 
loads panel and the inverter so that can happen more easily for first 
responders.  I have to go back and understand a few more things and will let 
you know.  Thanks again. Chris

On 11/16/2022 10:14 PM, Bradley Bassett wrote:
The issue as I see it is that the Tigo RSS Transmitter and the APsmart 
transmitter are both rated to draw up to 800ma. The 12VDC output of the Sol-Ark 
inverters is limited to 100ma. Since some have used this successfully I suppose 
that means that either these transmitters don't really use more than 100ma, or 
the 12VDC output of the Sol-Ark can actually handle more than that, or some 
combination of both. If I owned a Sol-Ark I'd test this to see what the answer 
is, but alas I do not. I design systems using a 48VDC to 12VDC power supply 
(Online Components has a Mean-Well device for a reasonable price, sorry no link 
from here) and a fairly rare IMO shutdown button (we have that) that has both 
NO and NC contacts. This is needed because to shut down the Sol-Ark inverter 
requires a NO contact that closes on initiation which is quite rare in RSD 
initiators. And you do still need to shut down the inverter as well as the RSD 
devices so that it does not continue to feed voltage back into the PV circuits 
(I think). This also shuts down the AC output of the Sol-Ark which tends to 
make the inspector happy. Since it also shuts down the inverter, that limits 
the battery to its own circuits, does this count as a battery disconnect also?? 
I'm seeing some inspectors calling out for battery disconnects which is much 
more problematic.

Brad Bassett
AEE Solar

On Wed, Nov 16, 2022 at 4:27 PM Jerry Shafer via RE-wrenches 
mailto:re-wrenches@lists.re-wrenches.org>> 
wrote:
Wrenches, Christopher
I have done quite a few and per solark have always connected in the inverter 
with no issues, Now with that connecting to the output side it would do much 
the same work until it did not then shut off the modules.
Fun times

On Wed, Nov 16, 2022 at 6:33 AM Christopher Warfel via RE-wrenches 
mailto:re-wrenches@lists.re-wrenches.org>> 
wrote:

Hi, We are doing our first system with these two devices. The inverter is 
SolArk 12P (mutimode) and the Tigo product for RS is the TS4F.  Tigo has me a 
little bit walking in circles.

I told them that SolArk says not to use the 12VDC RS output terminals for 
connecting the transmitter.  I gave them the attached drawing which they ask 
for, which shows the transmitter connected to a 120VAC/12VDC breaker which they 
supply.  They told me to wire the 120VAC source to the main service panel so 
the array would shut down on loss of power. I told them that is exactly NOTwhat 
I wanted to happen as that would stop the battery charging when there is a loss 
of utility power. I said I wanted the 120VAC source to be the back up loads 
panel. After about a week of calls and emails, I got an email back saying to 
use the SolArk 12VDC terminals for RS.  I just emailed them a screen shot of 
the SolArk manual that says not to do that.

At this point, I am asking anyone on the list to let me know how they wired the 
transmitter successfully. Thank you for any guidance, Chris Warfel





--
 Christopher Warfel
 ENTECH Engineering, Inc.
PO Box 871, Block Island, RI 02807
401-466-8978
[cid:part1.kvlyaN1Z.GZgWHIop@entech-engineering.com]


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Re: [RE-wrenches] "Qualified solar electric property"?

[Lloyd Hoffstatter via RE-wrenches]

California Energy Commission energy.ca.gov
All the best,
Lloyd

Get Outlook for iOS<https://aka.ms/o0ukef>

From: RE-wrenches  on behalf of 
Kristopher Schmid via RE-wrenches 
Sent: Wednesday, October 26, 2022 9:25:53 PM
To: RE-wrenches 
Cc: Kristopher Schmid 
Subject: Re: [RE-wrenches] "Qualified solar electric property"?

New York Public Service Commission and Conformité Européene listing, Lloyd?

Shine On!

Kris Schmid
Legacy Solar, LLC
137 West 1st Avenue
Luck, WI 54853
www.legacysolar.com<http://www.legacysolar.com>
715-653-4295
NABCEP Certified PV Installation Professional
Licensed Wisconsin Master Electrician
BSEE

On Wed, Oct 26, 2022, 8:18 PM Lloyd Hoffstatter 
mailto:ll...@sunstruckconsulting.com>> wrote:
For inverters use the NYPSC list or CE for other equipment

Best,
Lloyd

Get Outlook for iOS<https://aka.ms/o0ukef>

From: RE-wrenches 
mailto:re-wrenches-boun...@lists.re-wrenches.org>>
 on behalf of Kristopher Schmid via RE-wrenches 
mailto:re-wrenches@lists.re-wrenches.org>>
Sent: Wednesday, October 26, 2022 9:14:28 PM
To: cwar...@entech-engineering.com<mailto:cwar...@entech-engineering.com> 
mailto:cwar...@entech-engineering.com>>; 
RE-wrenches 
mailto:re-wrenches@lists.re-wrenches.org>>
Cc: Kristopher Schmid mailto:sol...@legacysolar.com>>
Subject: Re: [RE-wrenches] "Qualified solar electric property"?

Yes, but I believe an accountant wants to know how they prove and document that 
it is "solar electric property".

Shine On!

Kris Schmid
Legacy Solar, LLC
137 West 1st Avenue
Luck, WI 54853
www.legacysolar.com<http://www.legacysolar.com>
715-653-4295
NABCEP Certified PV Installation Professional
Licensed Wisconsin Master Electrician
BSEE

On Wed, Oct 26, 2022, 2:55 PM Christopher Warfel via RE-wrenches 
mailto:re-wrenches@lists.re-wrenches.org>> 
wrote:

I agree with Lloyd. It is qualified if listed I would have to believe. Chris

On 10/21/2022 6:36 PM, Lloyd Hoffstatter via RE-wrenches wrote:
Howie,
I think he is referring to the tax language 
https://www.irs.gov/newsroom/energy-incentives-for-individuals-residential-property-updated-questions-and-answers
Best regards,
Lloyd
Lloyd Hoffstatter
Sunstruck Consulting
Get Outlook for iOS<https://aka.ms/o0ukef>

From: RE-wrenches 
<mailto:re-wrenches-boun...@lists.re-wrenches.org>
 on behalf of Howie Michaelson via RE-wrenches 
<mailto:re-wrenches@lists.re-wrenches.org>
Sent: Friday, October 21, 2022 6:29:31 PM
To: RE-wrenches 
<mailto:re-wrenches@lists.re-wrenches.org>
Cc: Howie Michaelson 
<mailto:howie.michael...@gmail.com>
Subject: Re: [RE-wrenches] "Qualified solar electric property"?

Kris,
I found your query in the archives and Marcos follow-up question, but not the 
reply, apparently from George McClellan. I just called Sol-Ark and the sales 
person I talked with knew nothing about such a letter.  Fortress didn't have 
anything on their website and didn;'t answer their phone.
Do you still have the email response from George?
Thanks,
Howie
Howie Michaelson
Sun Catcher
NABCEP Certified Solar PV Installer™
[https://drive.google.com/uc?id=1MQF8aTcFNnBR59ia5JAm1DsPHCxzNkPx=download]
Solar Electric Systems Sales & Service
802-272-0004


On Fri, Oct 21, 2022 at 2:32 PM Kristopher Schmid via RE-wrenches 
mailto:re-wrenches@lists.re-wrenches.org>> 
wrote:
Search the archives, Howie.  I posted the same question this year and got a 
good response.  The documents should be available from the manufacturer.

Shine On!

Kris Schmid
Legacy Solar, LLC
137 West 1st Avenue
Luck, WI 54853
www.legacysolar.com<http://www.legacysolar.com>
715-653-4295
NABCEP Certified PV Installation Professional
Licensed Wisconsin Master Electrician
BSEE

On Fri, Oct 21, 2022, 1:14 PM Howie Michaelson via RE-wrenches 
mailto:re-wrenches@lists.re-wrenches.org>> 
wrote:
Hi folks,
I have a client that I'm doing a larger inverter and battery upgrade. We're are 
putting in 3Sol-Ark 15k inverters and 7 Fortress 18.5kwh units. The client is 
wanting manufacturer certification that the equipment is "qualified solar 
electric property". I don't know that I've ever run across this type of request 
before or that I've seen manufacturers supply such documentation. Is this 
something that anyone is familiar with? Did I miss something here?
Thanks,
Howie
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Re: [RE-wrenches] "Qualified solar electric property"?

[Lloyd Hoffstatter via RE-wrenches]

For inverters use the NYPSC list or CE for other equipment

Best,
Lloyd

Get Outlook for iOS<https://aka.ms/o0ukef>

From: RE-wrenches  on behalf of 
Kristopher Schmid via RE-wrenches 
Sent: Wednesday, October 26, 2022 9:14:28 PM
To: cwar...@entech-engineering.com ; 
RE-wrenches 
Cc: Kristopher Schmid 
Subject: Re: [RE-wrenches] "Qualified solar electric property"?

Yes, but I believe an accountant wants to know how they prove and document that 
it is "solar electric property".

Shine On!

Kris Schmid
Legacy Solar, LLC
137 West 1st Avenue
Luck, WI 54853
www.legacysolar.com<http://www.legacysolar.com>
715-653-4295
NABCEP Certified PV Installation Professional
Licensed Wisconsin Master Electrician
BSEE

On Wed, Oct 26, 2022, 2:55 PM Christopher Warfel via RE-wrenches 
mailto:re-wrenches@lists.re-wrenches.org>> 
wrote:

I agree with Lloyd. It is qualified if listed I would have to believe. Chris

On 10/21/2022 6:36 PM, Lloyd Hoffstatter via RE-wrenches wrote:
Howie,
I think he is referring to the tax language 
https://www.irs.gov/newsroom/energy-incentives-for-individuals-residential-property-updated-questions-and-answers
Best regards,
Lloyd
Lloyd Hoffstatter
Sunstruck Consulting
Get Outlook for iOS<https://aka.ms/o0ukef>

From: RE-wrenches 
<mailto:re-wrenches-boun...@lists.re-wrenches.org>
 on behalf of Howie Michaelson via RE-wrenches 
<mailto:re-wrenches@lists.re-wrenches.org>
Sent: Friday, October 21, 2022 6:29:31 PM
To: RE-wrenches 
<mailto:re-wrenches@lists.re-wrenches.org>
Cc: Howie Michaelson 
<mailto:howie.michael...@gmail.com>
Subject: Re: [RE-wrenches] "Qualified solar electric property"?

Kris,
I found your query in the archives and Marcos follow-up question, but not the 
reply, apparently from George McClellan. I just called Sol-Ark and the sales 
person I talked with knew nothing about such a letter.  Fortress didn't have 
anything on their website and didn;'t answer their phone.
Do you still have the email response from George?
Thanks,
Howie
Howie Michaelson
Sun Catcher
NABCEP Certified Solar PV Installer™
[https://drive.google.com/uc?id=1MQF8aTcFNnBR59ia5JAm1DsPHCxzNkPx=download]
Solar Electric Systems Sales & Service
802-272-0004


On Fri, Oct 21, 2022 at 2:32 PM Kristopher Schmid via RE-wrenches 
mailto:re-wrenches@lists.re-wrenches.org>> 
wrote:
Search the archives, Howie.  I posted the same question this year and got a 
good response.  The documents should be available from the manufacturer.

Shine On!

Kris Schmid
Legacy Solar, LLC
137 West 1st Avenue
Luck, WI 54853
www.legacysolar.com<http://www.legacysolar.com>
715-653-4295
NABCEP Certified PV Installation Professional
Licensed Wisconsin Master Electrician
BSEE

On Fri, Oct 21, 2022, 1:14 PM Howie Michaelson via RE-wrenches 
mailto:re-wrenches@lists.re-wrenches.org>> 
wrote:
Hi folks,
I have a client that I'm doing a larger inverter and battery upgrade. We're are 
putting in 3Sol-Ark 15k inverters and 7 Fortress 18.5kwh units. The client is 
wanting manufacturer certification that the equipment is "qualified solar 
electric property". I don't know that I've ever run across this type of request 
before or that I've seen manufacturers supply such documentation. Is this 
something that anyone is familiar with? Did I miss something here?
Thanks,
Howie
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Re: [RE-wrenches] "Qualified solar electric property"?

[Lloyd Hoffstatter via RE-wrenches]

Howie,
I think he is referring to the tax language 
https://www.irs.gov/newsroom/energy-incentives-for-individuals-residential-property-updated-questions-and-answers
Best regards,
Lloyd
Lloyd Hoffstatter
Sunstruck Consulting
Get Outlook for iOS<https://aka.ms/o0ukef>

From: RE-wrenches  on behalf of 
Howie Michaelson via RE-wrenches 
Sent: Friday, October 21, 2022 6:29:31 PM
To: RE-wrenches 
Cc: Howie Michaelson 
Subject: Re: [RE-wrenches] "Qualified solar electric property"?

Kris,
I found your query in the archives and Marcos follow-up question, but not the 
reply, apparently from George McClellan. I just called Sol-Ark and the sales 
person I talked with knew nothing about such a letter.  Fortress didn't have 
anything on their website and didn;'t answer their phone.
Do you still have the email response from George?
Thanks,
Howie
Howie Michaelson
Sun Catcher
NABCEP Certified Solar PV Installer™
[https://drive.google.com/uc?id=1MQF8aTcFNnBR59ia5JAm1DsPHCxzNkPx=download]
Solar Electric Systems Sales & Service
802-272-0004


On Fri, Oct 21, 2022 at 2:32 PM Kristopher Schmid via RE-wrenches 
mailto:re-wrenches@lists.re-wrenches.org>> 
wrote:
Search the archives, Howie.  I posted the same question this year and got a 
good response.  The documents should be available from the manufacturer.

Shine On!

Kris Schmid
Legacy Solar, LLC
137 West 1st Avenue
Luck, WI 54853
www.legacysolar.com<http://www.legacysolar.com>
715-653-4295
NABCEP Certified PV Installation Professional
Licensed Wisconsin Master Electrician
BSEE

On Fri, Oct 21, 2022, 1:14 PM Howie Michaelson via RE-wrenches 
mailto:re-wrenches@lists.re-wrenches.org>> 
wrote:
Hi folks,
I have a client that I'm doing a larger inverter and battery upgrade. We're are 
putting in 3Sol-Ark 15k inverters and 7 Fortress 18.5kwh units. The client is 
wanting manufacturer certification that the equipment is "qualified solar 
electric property". I don't know that I've ever run across this type of request 
before or that I've seen manufacturers supply such documentation. Is this 
something that anyone is familiar with? Did I miss something here?
Thanks,
Howie
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Re: [RE-wrenches] Complying with 690.9(B)

[Lloyd Hoffstatter via RE-wrenches]

Mac,
Bussman PVS-R-20 should work.

Best regards,
Lloyd

Lloyd Hoffstatter
Sunstruck Consulting

Get Outlook for iOS<https://aka.ms/o0ukef>

From: RE-wrenches  on behalf of Mac 
Lewis via RE-wrenches 
Sent: Wednesday, October 5, 2022 11:13:57 AM
To: RE-wrenches 
Cc: Mac Lewis 
Subject: [RE-wrenches] Complying with 690.9(B)

Hello Wrenches,

I have an inspector who doesn't like my heavy duty square D disconnect loaded 
with 20A Littelfuse FLSR RK5 Littelfuses for use as a OCPD and disconnect on a 
PV circuit.  I am operating below the 300Vdc rating for this fuse but I'm 
having trouble finding documentation that states that this fuse is listed for 
use in PV systems.
Does anyone know if these fuses have this listing for PV specifically?  Its not 
easy to find if they do.
Or perhaps a solar listed fuse designed for this disconnect?

If not, is there another disconnecting device that can work for this?  I am 
looking closely at the MNPV6-250 DISCO but again, the 300Vdc breakers that come 
with this are listed to  DC branch circuit protection (UL 489A, IEC / EN 
60947-2) not necessarily calling out PV specifically.

Any input is appreciated!

Thanks

--



Mac Lewis


"Yo solo sé que no sé nada." -Sócrates
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Re: [RE-wrenches] OB Radian question

[Lloyd Hoffstatter via RE-wrenches]

Kirk,
Ilsco or Marathon power distribution blocks with snap on covers?
Best regards,
Lloyd

Lloyd Hoffstatter
Sunstruck Consulting

Get Outlook for iOS<https://aka.ms/o0ukef>

From: RE-wrenches  on behalf of Kirk 
Herander via RE-wrenches 
Sent: Saturday, May 7, 2022 8:12:42 PM
To: RE-wrenches 
Cc: Kirk Herander 
Subject: Re: [RE-wrenches] OB Radian question

Further Clarification, Overcurrent protection etc. already exists, i’m not 
about to spend another $1k or more to replace it.

On Sat, May 7, 2022 at 7:56 PM Jerry Shafer via RE-wrenches 
mailto:re-wrenches@lists.re-wrenches.org>> 
wrote:
Just get an empty GSLC, at least it has the breakers
Jerry

On Sat, May 7, 2022, 1:44 PM Kirk Herander via RE-wrenches 
mailto:re-wrenches@lists.re-wrenches.org>> 
wrote:
Ok, time to break wrenches radio silence over the last week.

My question concerns the Radian battery terminal connections. I don't need nor 
want to use the expensive GSLC box in a 23-y.o. off-grid upgrade to a Radian. 
That means the battery-to-inverter connections will be exposed, unless I find 
another way to enclose them.

Do those OB snap-on terminal covers used with the FX series work with the 
Radian? Any other ideas?

Thanks. Over and out.
--

Kirk Herander / kirkh@vermont.solar<mailto:kirkh@vermont.solar>

Owner|Principal, VT Solar, LLC

Celebrating our 31st Anniversary 1991-2022!!

www.vermont.solar<https://nam02.safelinks.protection.outlook.com/?url=www.vermontsolarnow.com=02%7C01%7C%7C9f0330d75a244870112408d685311841%7C84df9e7fe9f640afb435%7C1%7C0%7C636842843233477645=0NjyuKeQbEK6245SNnk8X4XnP9Q%2B%2BqtvcALkdDghvk4%3D=0>

dba Vermont Solar Engineering

802.863.1202

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--

Kirk Herander / kirkh@vermont.solar<mailto:kirkh@vermont.solar>

Owner|Principal, VT Solar, LLC

Celebrating our 31st Anniversary 1991-2022!!

www.vermont.solar<https://nam02.safelinks.protection.outlook.com/?url=www.vermontsolarnow.com=02%7C01%7C%7C9f0330d75a244870112408d685311841%7C84df9e7fe9f640afb435%7C1%7C0%7C636842843233477645=0NjyuKeQbEK6245SNnk8X4XnP9Q%2B%2BqtvcALkdDghvk4%3D=0>

dba Vermont Solar Engineering

802.863.1202
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Re: [RE-wrenches] Rapid Shutdown for Off-grid systems

[Lloyd Hoffstatter]

We’ve used multi-pole rated disconnects at the array.
Best regards,
Lloyd

Lloyd Hoffstatter
Sunstruck Consulting

Get Outlook for iOS<https://aka.ms/o0ukef>

From: RE-wrenches  on behalf of 
Jeremy Rodriguez 
Sent: Tuesday, February 1, 2022 8:31:16 PM
To: RE-wrenches 
Subject: Re: [RE-wrenches] Rapid Shutdown for Off-grid systems

What about the PV circuits that leave the combiner and are ran on or in a 
building to the CC



Jeremy Rodriguez
Solar Installation / Design Expert
All Solar, Inc.
1453 M St
Penrose Colorado 81240

Sent by Jeremy's iPhone. Sorry for typos and shorthand.

On Feb 1, 2022, at 4:07 PM, Brian Mehalic  wrote:

 For a ground mount PV system with a DC combiner, the PV source circuits are 
not in or on a building so RS doesn’t apply to them. And the definition of a 
charge controller in Art. 100 is in its relationship to batteries/storage, not 
really the charging source - fundamentally it’s there to protect the 
storage/batteries, so it’s best considered part of that system, not the PV 
system (and over the last several cycles nearly all references to charge 
control/lers have been moved out of 690).





Brian

On Feb 1, 2022, at 3:15 PM, Bradley Bassett  wrote:


"A switch, outside of the building, opening the PV circuit to the power 
electronics, and functioning as the pv system disco and the rapid shutdown 
initiation device, should be all that is required."

That is what I have found most inspectors will accept, but not all. A strict 
reading of the code does come to the same conclusion that William comes to, and 
some inspectors will require that. The code is not very specific on where the 
PV system disconnect should go. It seems to be mostly accepted to be on the PV 
side of the charge control, but when I read the code strictly it seems to me it 
should be on the battery side of the charge control since it is only a PV 
device. Fortunately the PV side is more accepted because that makes things much 
easier.

What I'm still having trouble with is the requirement for breaking both pos and 
neg legs in the PV system disconnect unless solidly grounded which most systems 
are not (690.13(E)). I see that most installers do not break both poles, but 
only the positive leg, which is of course easier and less expensive. I've 
quoted the use of dual pole breakers when possible, but OutBack does not really 
call for that always, and if you ask about their 2 pole 300V breakers they (and 
Carling) don't say they can be used that way. And if you do, you have to run 
the wires in opposite directions for polarity. I've asked for clarification but 
have not received it yet. Then there are the high voltage charge controls like 
Schneider, where often one uses the SqD HU361, which can be wired in various 
ways to meet the 600V requirement. It can be wired one pole for up to 18A Isc 
for PV, or up to 30A if two poles in series, or one pos and one neg pole in the 
circuit. The Schneider RS Disco does break both poles, one of the few devices 
that make it clear. I'm curious what others are doing.

Brad

On Tue, Feb 1, 2022 at 11:23 AM Brian Mehalic 
mailto:br...@solarenergy.org>> wrote:
Sorry, forgot to state my previous comment was in regards to a ground-mount.

Brian

On Feb 1, 2022, at 12:19 PM, William Miller 
mailto:will...@millersolar.com>> wrote:



Ray:



Thanks for that input.  I was hoping I was wrong.  I looked for that discussion 
in the archives but could not find it.



William



Miller Solar

17395 Oak Road, Atascadero, CA 93422

805-438-5600

www.millersolar.com<http://www.millersolar.com/>

CA Lic. 773985





From: RE-wrenches 
[mailto:re-wrenches-boun...@lists.re-wrenches.org<mailto:re-wrenches-boun...@lists.re-wrenches.org>]
 On Behalf Of Ray
Sent: Tuesday, February 1, 2022 10:11 AM
To: re-wrenches@lists.re-wrenches.org<mailto:re-wrenches@lists.re-wrenches.org>
Subject: Re: [RE-wrenches] Rapid Shutdown for Off-grid systems



 Ground mounts do NOT require RSS.  We hashed this out years ago on the 
Wrenches list, when NEC 2017 came out.

See Figure 690.1(B) Note (2): " The PV system disconnect in these diagrams 
separates the PV system from all other systems".

Thus, the PV disconnect is defined as the transition point from the PV system 
to all other systems, like battery or inverter systems. The installer/ designer 
decides where to put that disconnect.  I usually put it on the wall before it 
goes into the building, and I have never had an inspector question that.

Thanks,

Ray Walters

Remote Solar

303 505-8760

On 2/1/22 10:06 AM, William Miller wrote:

Jay:



Here is the text from 2017:



690.12 Rapid Shutdown of PV Systems on Buildings. PV

system circuits installed on or in buildings shall include a rapid

shutdown function to reduce shock hazard for emergency

responders in accordance with 690.12(A) through (D).



Exception: Ground mounted PV system circuits that enter bui

Re: [RE-wrenches] SolarEdge inverter blowing fuses

[Lloyd Hoffstatter]

Dave,

My first thought would be a small nick in wire insulation going to ground, 
causing the fuse to fail over time.
We had a similar situation with a much larger system where the culprit was hard 
to notice…

Best regards,
Lloyd

Lloyd Hoffstatter
Sunstruck Consulting

Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows

From: Dave Tedeyan<mailto:d...@sungineersolar.com>
Sent: Monday, November 1, 2021 4:26 PM
To: RE-wrenches<mailto:re-wrenches@lists.re-wrenches.org>
Subject: [RE-wrenches] SolarEdge inverter blowing fuses

Hi All,

I am servicing a system that keeps blowing fuses on the AC side, although it
 appears that everything is sized correctly. It is a SolarEdge SE11400A-US 
inverter.
 Max continuous output current is 47.5A x 1.25 = 59.4A. There is a GE TG3222R
 60A AC disconnect, and it is wired up with #6 THHN wire. The terminals were 
tight
 and there was no evidence of arcing or burning in the past. This is indoors, 
and not
 exposed to sunlight. No extra conductors are in the conduit.

But they say that they need to replace a fuse roughly once per month. Has anyone
 seen this before? Could there be some kind of fault in the inverter itself that
 occasionally induces extra current? Is there any way to tweak the settings so 
that it
 actually produces a bit more than 11.4kw? I appreciate your thoughts.

Cheers,
Dave

--
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Owner | Sungineer Solar
p: he | him | his
a: 1653 Slaterville Rd. | Ithaca, NY 14850
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Re: [RE-wrenches] Trace SW repair assistance

[Lloyd Hoffstatter]

Hello Kurt,

Craig Wilburn at Phantom Power Services should be able to help.
425-501-7280
https://phantompowerservices.com/

Best of luck,
Lloyd

Lloyd Hoffstatter
Sunstruck Consulting



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From: Kurt Albershardt<mailto:rewre...@sw-ei.com>
Sent: Friday, October 29, 2021 11:46 AM
To: RE-wrenches<mailto:re-wrenches@lists.re-wrenches.org>
Subject: [RE-wrenches] Trace SW repair assistance

Good morning, all.

Long time no write.

We have a client with an SW4024 that recently suffered a lightning hit.  The 
inverter is actually working fine (those things were truly tough) but the 
cooling fan now runs continuously.

The SW design team long ago scattered to the winds of Outback, Midnight, etc. 
Schneider is clueless.  Anyone have a pointer to someone who might be able to 
assist with schematics or guidance on an emergency repair?

We're planning to replace the unit next spring, when the sun is back in all of 
its glory.


thank you~

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Re: [RE-wrenches] Trace 4024 cutting out

[Lloyd Hoffstatter]

Bill,
Craig Wilburn at Phantom Power Service, 425-501-7280, rebuilt a couple of 
SW4024 boards
for me about 2 years ago, reasonable price and very helpful instructions and 
photos.

Best regards,
Lloyd

Lloyd Hoffstatter
Sunstruck Consulting
845-657-8132

Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows

From: frenergy<mailto:frene...@psln.com>
Sent: Monday, October 18, 2021 12:07 AM
To: re-wrenches@lists.re-wrenches.org<mailto:re-wrenches@lists.re-wrenches.org>
Subject: [RE-wrenches] Trace 4024 cutting out

Hey Folks,

 I haven't seen this one until yesterday.  Customer with a
20 year old Trace SW4024 called.  I've been servicing this reliable
system for the last 8 years.  He said after a delay the power shuts off
when a moderate load comes on after 5-15 seconds, then back on, then
off.  Light loads no problem, the power stays on.  The inverter
stays on the entire time (yellow light and that famous audio buzz) but I
hear a relay? inside the left side of the wiring section with each
change of on-off, off-on state. I assume its a repair to a service
shop.  Ideas? Recommendations for repair shops?  I haven't been getting
a response from the Solar Cowboyz in Grass Valley.

Thanks,

Bill

Feather River Solar Electric
Bill Battagin, Owner
4291 Nelson St.
Taylorsville, CA 95983
530.284.7849
CA Lic 874049
solar powered since 1982


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Re: [RE-wrenches] Looking for multiple 100 kW inverters

[Lloyd Hoffstatter]

Marco,

Craig Wilburn at Phantom Power Services may be able to help with the boards.
425-501-7280

Best of luck,
Lloyd

Lloyd Hoffstatter
Sunstruck Consulting

Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows

From: Marco Mangelsdorf<mailto:ma...@pvthawaii.com>
Sent: Wednesday, October 13, 2021 6:31 PM
To: RE-wrenches<mailto:re-wrenches@lists.re-wrenches.org>
Subject: [RE-wrenches] Looking for multiple 100 kW inverters

Aloha Wrenches,

I'm looking for as many as six 100 kW @ 480VAC inverters to replace as many 
Xantrex GT100s.

Any suggestions would be appreciated. Also (now please don't laugh), does 
anyone know of any electro wizard or wizardess who's repairing GT boards?

Mahalo,
marco

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Re: [RE-wrenches] Exploding RSD Unit

[Lloyd Hoffstatter]

James,

You may want to take a look at this SunSpec RSD / Optimizer just making it to 
market.
https://enteligent.com/solarup-rsd

It has self diagnostics and thermal shutdown, comes in 1 or 2 module 
configurations.

Best regards,
Lloyd Hoffstatter
Sunstruck Consulting


Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows

From: James Jarvis<mailto:j...@aprsworld.com>
Sent: Friday, August 27, 2021 11:48 AM
To: RE-wrenches<mailto:re-wrenches@lists.re-wrenches.org>
Subject: Re: [RE-wrenches] Exploding RSD Unit

So who has a good reliable off grid RSD? It all looks like failure prone 
garbage to me.
Thank you,

-James Jefferson Jarvis
APRS World, LLC
+1-507-454-2727

(Sent from my phone. My apologies for spelling errors and brevity.)

On Fri, Aug 27, 2021, 05:02 Tump mailto:t...@swnl.net>> wrote:
I would once again say that; we as an industry can influence not only the 
writing of the code but with what we are buying OR not buying.
If the devices we are required to install to make things “more safe & 
reliable”, at the cost of our livelihoods & reputations, we all need to make 
the folks that are building the RSD crap and those who require installation of 
questionably safe & reliable crap aware of these problems.
WE can thru either going to the code development  meetings AND NOT buying or 
installing this stuff. Not too easy when a huge amount of solar is rooftop 
installs. As many of the installers in the NE know its not a single level ranch 
were installing this stuff on, short season & man lift required.
Tell your supplier why you are not buying that brand, let  your supplier & 
folks on the list what manufacture has good reliable products AND tech support 
that we can understand, who we can get in a timely fashion, and get the 
satisfaction of a prompt replacement.  IF we don’t sell it they won’t have a 
job or a market.
On Aug 26, 2021, at 2:09 PM, Jeremy Coxon 
mailto:jco...@sunwindpowerinc.com>> wrote:

Carl,

Did you get any kind of joy out of APSmart on that failure?

I will say that their tech support guy did at least try to be helpful, but the 
language barrier was really really steep and their distribution channels are 
less than ideal.  Their response to a request for compensation was that they 
would not be profitable if they had to pay for truck rolls for such a low cost 
item.  I really don’t think they GET IT.  We’ve been in business for over 16yrs 
and this one failure could easily have ended that run.

I cannot imagine we’re alone here.  I was told by AP that their failure rate 
was 0.2%. Now, I come from a reliability engineering background in petro 
chemical/ big pharma where a 0.2% failure rate would be catastrophic.  Can you 
imagine that 2 out of every 1000 pills made could cause death?  We engineered 
secondary systems and multiple quality checks to contain catastrophic 
consequences for components that had know failure rates higher than acceptable 
values.  A simple solution to this fire initiation issue would be a metal 
enclosure instead of plastic casing.  That still doesn’t really solve the 
problem of extra connections though.

Best Regards,
Jeremy Coxon NABCEP # 091308-21
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tump3...@gmail.com<mailto:3...@gmail.com>   www.SWNL.net
Solarwinds Northernlights
   Serving Mid Coast Maine & Northern California
 207-832-7574   Cl. 610-517-8401
  Blair "TUMP" May

     MAINE'S CHARTER 
  NABCEP"Certified PV Installer"

    MAINE'S CHARTER 
  Trace Xantrex "Certified" Dealer / Installer"



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Re: [RE-wrenches] Off Grid Food Truck

[Lloyd Hoffstatter]

James,

You may want to talk to SunWize. Historically they have packaged and shipped 
small systems all over.

Best Regards,
Lloyd Hoffstatter
Sunstruck Consulting

Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows

From: James Rudolph<mailto:jamesrudolp...@gmail.com>
Sent: Thursday, August 19, 2021 1:18 PM
To: RE-wrenches<mailto:re-wrenches@lists.re-wrenches.org>
Subject: [RE-wrenches] Off Grid Food Truck

Aloha Wrences,
I am trying to help some folks out here power up their 400w refrigerator  that 
is in their stationary food truck on the North Shore of Oahu.
I have a couple systems in mind ,but I am having a difficult time trying to 
find someone to ship a kit out here. The suppliers on this island have not been 
able to help with a small system that my client needs.
Does anyone have any experience shipping small off grid kits outside the 48 
states , or have a contact/supplier that I can speak to?

Mahalo in advance.



James B. Rudolph
Independent Energy C-36080
ES #10816
NABCEP Certified PV Installer since 2009  #091209-155
C. 808.313.9701


[https://docs.google.com/uc?export=download=1epSX66lZx4hdpGIh0mKHasN-i0LVxd85=0B_lycoVrDLvaZE1weVZDQkxvM2x0NS9hamZ0SEJwSHUreC9VPQ]




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Re: [RE-wrenches] Charging a 108V battery bank

[Lloyd Hoffstatter]

Dave, this forum discussion should be helpful 
https://www.cruisersforum.com/forums/f14/differences-in-marine-and-rv-inverters-chargers-38195.html

Best regards,
Lloyd

Lloyd Hoffstatter
Sunstruck Consulting
945-657-8132

Get Outlook for iOS<https://aka.ms/o0ukef>

From: RE-wrenches  on behalf of Dave 
Tedeyan 
Sent: Wednesday, June 30, 2021 3:50:15 PM
To: RE-wrenches 
Subject: [RE-wrenches] Charging a 108V battery bank

Hi All,

I am going to be working with someone who plans to completely electrify a boat. 
The electric motor is meant to run on nine 12V batteries, or 108V. The motor 
manufacturer recommends a charger that can run on 120V or 240V. But has anyone 
seen a charger that can take solar power and directly charge a battery bank of 
108V? The alternative that I see here is to have two separate battery banks, 
one for the motor, and one for house loads. Then we would have the solar charge 
a 48V battery bank, and then use an inverter to charge the 108V battery bank. 
It seems inefficient, although that may be the only choice.

A separate but related question: what is special about a marine inverter? If 
there is a 5kw charger for the battery bank, we will need a large inverter to 
handle this plus other AC loads, and I am not sure if there are "marine" 
inverters this large. And so other than concerns about getting wet, is there 
harm to putting a Radian, or a Sol-Ark on a boat?

Cheers,
Dave

--
[Logo]<https://www.sungineersolar.com/>
Dave Tedeyan, P.E.
Owner | Sungineer Solar
p: he | him | his
a: 1653 Slaterville Rd. | Ithaca, NY 14850
w: www.sungineersolar.com<http://www.sungineersolar.com/>
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Re: [RE-wrenches] RSD Troubleshooting Help

[Lloyd Hoffstatter]

Rick,
I would check with SMA to make sure you have the latest firmware.

Best regards,
Lloyd

Lloyd Hoffstatter
Sunstruck Consulting

Get Outlook for iOS<https://aka.ms/o0ukef>

From: RE-wrenches  on behalf of 
r...@solshineenergy.com 
Sent: Monday, June 21, 2021 11:42:36 AM
To: RE-wrenches 
Subject: [RE-wrenches] RSD Troubleshooting Help

Wrenches,

I’m in need of some troubleshooting help on a newly installed system with rapid 
shutdown. System consists 2 SMA SB5.0-1 SP-US-41 (RSD version), RSD devices are 
APS RSD-S-PLC. Each SB is configured with two strings of 9. Modules are REC 
Alpha 360s.

This system was fully functional for about 1 week before things went awry. 
Initial symptoms were that one of the two strings read 0V 0A on the display 
while the other read ~315V, 5A. The RSD devices output ~700mV each when in the 
off mode (a nice verification feature). I’m reading the correct voltage - 6.75V 
- on both strings when in off mode. Once the Sunny Boy comes on line I’m 
reading around 10V on the faulty string and the correct voltage - ~315V - on 
the other string.

The above seems to indicate that each RSD is getting sufficient DC voltage from 
the module. Short of pulling each module and doing a visual check what else can 
I look at? How do you isolate a faulty RSD device?

And as luck would have it, everything is functional at the moment.

Thanks,

rick brown
SolShine Energy Alternatives, LLC
Electrical & Solar Contracting Services
www.SolShineEnergy.com<http://www.SolShineEnergy.com>
Check, Virginia 24072
O: 540.235.3095
M: 540.808.9502

VA Class A Contractor Lic# 2705147660
VA Master Electrician Lic# 2710062762
VA Alternative Energy Systems Installer
NABCEP Certified PV Installation Professional 110112-21





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Re: [RE-wrenches] seeking 3ph battery based/backed inverters and experiences

[Lloyd Hoffstatter]

A couple of other sources – Ideal, Delta and Princeton Power all have larger 
battery based (typ. 480 VAC) inverters. Some info on Ideal 30 kW
https://www.idealpower.com/wp-content/uploads/2016/02/30kW-battery-converter-RevD-16Feb2016.pdf

Best regards,

Lloyd
Sunstruck Consulting

Sent from Mail for Windows 10

From: Jay
Sent: Wednesday, April 21, 2021 11:30 AM
To: offgridso...@sti.net; 
RE-wrenches
Subject: Re: [RE-wrenches] seeking 3ph battery based/backed inverters and 
experiences

Here is another from CPS

https://www.chintpowersystems.com/wp-content/uploads/2020/06/CPS-ESS-30-60kW-65-130kWh-Datasheet-September-19-2019.pdf

Jay


On Apr 21, 2021, at 8:32 AM, Dave Angelini Offgrid Solar  
wrote:


I know Schneider has a way for that Jay. I just took XWpro webinar yesterday. 
Maybe a transformer was used for 480v but clusters up to around 40 KW.



Dave Angelini Offgrid Solar

"we go where powerlines don't"

http://members.sti.net/offgridsolar/

e-mail  offgridso...@sti.net

text 209 813 0060

On Wed, 21 Apr 2021 06:26:33 -0600, Jay  wrote:
Hi Christopher

I'm not sure what power your looking for.

Try

https://www.princetonelec.com/dela-inverter

There are others too

None of the normal ( OB, Schneider etc) will do 208-480. Only 120-208

Jay


On Apr 20, 2021, at 4:15 PM, Chris Schaefer  wrote:
G'day All,

I'm not familiar with any 3 ph 208 to 480vac battery backup inverter 
manufacturers. So if you could point me in the right direction on who you know 
and better yet who you've had experience with, good, bad or otherwise, that 
would be extremely helpful.

Happy 420 to all my fellow Solar Bozo's,
Christopher-

Chris Schaefer's
[http://www.solarandwindfx.com/wp-content/uploads/2015/01/Solar-Wind-FX-Logo.png]
Tel/Fax 585-229-2083 or Cell 585-748-1870
5115 South Hill Road ~ Canandaigua New York 14424
www.solarandwindfx.com ~ E-mail: 
ch...@solarandwindfx.com

[http://solarandwindfx.com/wp-content/uploads/2015/01/certs.jpg]

Thomas Jefferson, the author of our great Constitution, once said, "democracy" 
will cease to exist when you take away from those who are willing to work and 
give to those who would not."
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Re: [RE-wrenches] PV shade structure

[Lloyd Hoffstatter]

Dana,
You may want to see if brooklynsolarworks.com has a solution that will meet the 
loading...

Best regards,
Lloyd Hoffstatter
Sunstruck Consulting

From: RE-wrenches  On Behalf Of Dana 
Orzel
Sent: Friday, January 15, 2021 8:02 AM
To: 'RE-wrenches' 
Subject: [RE-wrenches] PV shade structure

Hey Now All You Wise Ones!

I got a request for a 2nd story flat roof PV - shade structure yesterday. This 
being snow country we have 100#/sqft snow loading.

Has anyone done something in this range? Supplier suggestions?

Thanks in advance.




Dana Orzel  Great Solar Works, Inc.
C - 208.721.7003   
d...@solarwork.com<mailto:d...@solarwork.com>
Idaho Contractor - # 028765 Idaho PV # 028374
NABCEP # 051112-136   
www.solarwork.com<http://www.solarwork.com/>
"Responsible Technologies for Responsible People since 1988"
P Please consider the environment before printing this email.


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Re: [RE-wrenches] 120v batteryless gT inverter

[Lloyd Hoffstatter]

Jay,
Suggest micros - minimal DC, less labeling, RSD compliant, simple tie-in.

Best regards
Lloyd Hoffstatter
Sunstruck Consulting

Get Outlook for iOS<https://aka.ms/o0ukef>

From: RE-wrenches  on behalf of Jay 

Sent: Wednesday, January 13, 2021 3:36:10 PM
To: RE-wrenches 
Subject: [RE-wrenches] 120v batteryless gT inverter

Hi all

I’ve got someone looking for a 1500-2000 watt 120vac GT inverter

Could be micro or sting.

Any ideas?

Thanks
Jay
Peltz power.
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Re: [RE-wrenches] unfused disconnect before service disconnect

[Lloyd Hoffstatter]

Dave,
Looking at 2014, NEC 250.24(B) FPN and exhibits tends to imply bonding at first 
means of disconnect. This also minimizes potential ground loops.
Best regards,
Lloyd Hoffstatter
Sunstruck Consulting

Get Outlook for iOS<https://aka.ms/o0ukef>

From: RE-wrenches  on behalf of Dave 
Tedeyan 
Sent: Thursday, October 29, 2020 9:56:47 AM
To: RE-wrenches 
Subject: [RE-wrenches] unfused disconnect before service disconnect

I'm looking to the hive mind here to see if others can weigh in on an issue I 
am having with an inspector. Grid tied PV system, with a line side tap in an 
automatic transfer switch. There is an outdoor utility required system 
disconnect right next to the transfer switch. But there was not enough physical 
space to get something that was service rated with overcurrent protection. So 
we installed a QO200TR, which is a tiny switch that looks like a circuit 
breaker, is rated at 60A, but does not actually have overcurrent protection. 
Then just inside the basement is the service disconnect with the neutral ground 
bond, etc. The inspector is telling me to bond the neutral and ground in the 
outdoor unfused disconnect, and remove it in the disconnect in the basement.

I am having trouble finding a code reference. Does anyone know of one showing 
that the unfused disconnect is not the service point even though it comes 
first? Or is this not something that is allowed? We are on NEC 2017 here in NY..
.
Thanks!
-Dave

Dave Tedeyan, PE
Senior Engineer | Taitem Engineering, PC
[https://www.taitem.com/signatures/logo.png]
110 South Albany Street | Ithaca, NY 14850
o. 607.277.1118 x121  f. 607.277.2119
www.taitem.com<http://www.taitem.com>

Solar • Sustainability • Energy • Design
Certified B-Corporation since 2013
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Re: [RE-wrenches] Site Groundskeeping

[Lloyd Hoffstatter]

We used a state approved low grow seed mix in NJ. Some info on seed mixes from 
NREL. https://www.nrel.gov/docs/fy17osti/66218.pdf

Best regards,
Lloyd Hoffstatter
Sunstruck Consulting

Get Outlook for iOS<https://aka.ms/o0ukef>

From: RE-wrenches  on behalf of Ray 

Sent: Wednesday, May 13, 2020 11:07:18 PM
To: re-wrenches@lists.re-wrenches.org 
Subject: Re: [RE-wrenches] Site Groundskeeping

Goats are definitely off, I found they ate everything except what you
wanted them to.  Very cute though.  The low profile "Robo mower" idea
has merit.

The best I've seen was a wild flower seed mix, that all grew only a
couple of feet high max.  They probably needed some weed wacking a few
times a year, but much less than grass.  Totally depends on the
location.  On the wet side of Maui, you would have the array disappear
into the jungle in 6 months, never to be seen again.  In the desert, it
might be sage brush after 10 years.

I worked on a project once that used 4" deep gravel spread over 160
acres.  Total disaster in my opinion; think how many cubic yards had to
be trucked in.  Vehicles got stuck in the loose gravel, it slowed
everyone down, and 3 ft high weeds were growing up out of it in 6
weeks.  Then when you went to weed wack, you had gravel projectiles sent
flying into the glass.


Ray Walters
Remote Solar
303 505-8760

On 5/13/20 9:28 PM, Jay wrote:
> Have you thought of sheep?
>
> Goats can be tough as they like to eat wire and climb on the panels. But if 
> the modules are off the ground high enough might work.
>
> Jay
>
> Peltz power.
>
>
>> On May 13, 2020, at 6:22 PM, Corey Shalanski  wrote:
>>
>> 
>> 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 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
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Re: [RE-wrenches] combining 24v and 12v systems

[Lloyd Hoffstatter]

Chris,

I would look into DC / DC converters (many available).

Happy New Year Chris and All,

Lloyd

Lloyd Hoffstatter
Sunstruck Consulting




Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10

From: Chris Schaefer<mailto:ch...@solarandwindfx.com>
Sent: Tuesday, December 31, 2019 11:52 AM
To: RE-wrenches<mailto:re-wrenches@lists.re-wrenches.org>
Subject: [RE-wrenches] combining 24v and 12v systems

G'day and Happy New Year to All,

Recently came across this offgrid OB FX system. The first part is a 12v battery 
system w/ 2 PV modules, 2 Trojan L16  batteries used to power a frig and 
freezer about 6 years old. The second is a 24v with 3kw of PV, 4 Trojan L16's, 
twin OB FX inverters installed by an HVAC contractor back in 2016. This was 
their first offgrid project. Oh boy, lol. The client would like to add more 
battery capacity to both. My thought here is since we are powering only a 12v 
frig and freezer why not simplify the system by creating a single battery bank 
and then tapping off of the 24v bank using proper fusing and creating a 12v 
buss? Admittedly I live in a 48v world so I'm asking our esteemed colleges as 
to options on how to address this.

Oh yeah, the installer is unresponsive (no surprise there) and they are also 
having firmware issues with an old Mate 3 and would like me to install a new 
Mate 3s but that's another issue I'll tackle when I head out to site.

Thanks All,
Christopher-

Chris Schaefer’s
[http://www.solarandwindfx.com/wp-content/uploads/2015/01/Solar-Wind-FX-Logo.png]<http://www.solarandwindfx.com>
Tel/Fax 585-229-2083 or Cell 585-748-1870
5115 South Hill Road ~ Canandaigua New York 14424
www.solarandwindfx.com<http://www.solarandwindfx.com> ~ E-mail: 
ch...@solarandwindfx.com<mailto:ch...@solarandwindfx.com>

[http://solarandwindfx.com/wp-content/uploads/2015/01/certs.jpg]

Thomas Jefferson, the author of our great Constitution, once said, "democracy" 
will cease to exist when you take away from those who are willing to work and 
give to those who would not."

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Re: [RE-wrenches] NEC 2014 690.12 Rapid Shutdown - for multiple arrays

[Lloyd Hoffstatter]

Al,

You may find this article and the one referenced to be helpful

https://www.purepower.com/blog/nec-690-12-rapid-shutdown-length

Best regards,

Lloyd Hoffstatter
Sunstruck Consulting

Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10

From: Al Frishman<mailto:evolvedso...@gmail.com>
Sent: Tuesday, December 3, 2019 11:42 AM
To: RE-wrenches<mailto:re-wrenches@lists.re-wrenches.org>
Subject: [RE-wrenches] NEC 2014 690.12 Rapid Shutdown - for multiple arrays

Hey Wrenchers,
What is your interpretaion regarding NEC 2014 690.12 Rapid Shutdown of PV 
Systems on Buildings when dealing with multiple arrays separated by 4 ft paths 
on flat roofs.For example can one inverter located at the East end of an 
array be connected to solar panels on both the adjacent array to the inverter 
and a 2nd or even 3rd array located to the West separated by 4 ft paths?

I appreciate your feedback.

Al Frishman
EvolvedSolar
(917) 699-6641


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Re: [RE-wrenches] 705.95(B) and Sunny Boys - current on Neutral?

[Lloyd Hoffstatter]

Jeff,

An oldie but attached tech note explains.
May Need to upsize G / N  for voltage drop depending on run…

Best regards,

Lloyd

Lloyd Hoffstatter
Sunstruck Consulting

Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10


From: RE-wrenches  on behalf of Jeff 
Clearwater 
Sent: Wednesday, November 13, 2019 12:00:37 PM
To: RE-wrenches 
Subject: [RE-wrenches] 705.95(B) and Sunny Boys - current on Neutral?

Hey Folks,

So does anyone have a reference I can show my AJH as to whether there is any 
current on the neutral of a single phase 240 VAC SB 7.7-40 inverter?

705.95(B) states:

Neutral Conductor for Instrumentation, Voltage
Detection or Phase Detection. A conductor used solely for
instrumentation, voltage detection, or phase detection and
connected to a single-phase or 3-phase utility-interactive
inverter, shall be permitted to be sized at less than the
ampacity of the other current-carrying conductors and shall
be sized equal to or larger than the equipment grounding
conductor.

Be great not have to run 3/0 wire to my dedicated PV subpanel with 5 SB7.7s.  
At 200 Amps I could use 6 AWG according to 705.95.  A huge savings in wire pull 
hassle not to mention copper.

Are there any other practical considerations for those SBs to operate well if I 
were to go that low with the neutral?

Anybody have any field experience with AJHs on this?

Thanks,

Jeff

~~~
Jeff Clearwater
Village Power Design
linkedin<https://www.linkedin.com/in/jeff-clearwater-0622a312/>
www.villagepowerdesign.com<http://www.villagepowerdesign.com>
cell - 413-559-9763
~~~


Neutral Conductor Size for Sunny Boy Inverters_v2 (1).pdf
Description: Neutral Conductor Size for Sunny Boy Inverters_v2 (1).pdf
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Re: [RE-wrenches] Xantrex SW 5548

[Lloyd Hoffstatter]

Jerry,

I recently rebuilt a SW4048 with board testing and repair by Craig Kilburn at 
Phantom Power Services.
He was fast and reasonable. 
cr...@phantompowerservices.com<mailto:cr...@phantompowerservices.com>

Lloyd Hoffstatter
That solar guy
Sunstruck Consulting

Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10


From: RE-wrenches  on behalf of 
Jerry Shafer 
Sent: Tuesday, August 27, 2019 3:27:13 PM
To: RE-wrenches 
Subject: [RE-wrenches] Xantrex SW 5548

Wrenches
Is there anyone still repairing the older Xantrex boards, I have a main 
(mother) board that is glitching, I thought there was a guy on the list that 
does this any Ideas
Jerry
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Re: [RE-wrenches] Solar area lighting

[Lloyd Hoffstatter]

Try Selux 
https://www.google.com/search?q=selux+lighting+usa=UTF-8=UTF-8=en-us=safari#trex=m_t:lcl_akp,rc_f:nav,rc_ludocids:12814526711032620612,rc_q:Selux%2520Corporation,ru_q:Selux%2520Corporation

Get Outlook for iOS

From: RE-wrenches  on behalf of Ron 
Young 
Sent: Thursday, August 22, 2019 8:09:33 PM
To: RE-wrenches 
Subject: [RE-wrenches] Solar area lighting

Hello Wrenches, I’m looking for some solar area lighting or street lights for a 
local project. I need decent wattage or lumens, nothing under 5000 lumens. Has 
anyone had any experience with these? I’ve seen a few on Amazon etc. but a lot 
of conflicting and unreliable info. I contacted solar lighting in Fla. with no 
response.

Ron
earthRight - Solareagle.com
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Re: [RE-wrenches] Dead Outback mx60

[Lloyd Hoffstatter]

Bob,



Try Craig Wilburn at 
cr...@phantompowerservices.com<mailto:cr...@phantompowerservices.com>



He rebuilt some boards for a SW4048 and may know the ins and outs of the MX 60.



Best regards,

Lloyd Hoffstatter

Sunstruck Consulting



Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10




From: RE-wrenches  on behalf of RE 
Ellison 
Sent: Sunday, July 21, 2019 4:19:47 PM
To: re-wrenches@lists.re-wrenches.org 
Subject: Re: [RE-wrenches] Dead Outback mx60

That originally said “I have a customer” I hate auto correct and spell check

Bob

> On Jul 21, 2019, at 4:18 PM, RE Ellison  wrote:
>
> I’m a customer about three hours away with what I believe is a dead MX 60 
> about 10 years old
> He recently changed his own battery pack and I’m guessing that he did not 
> shut off the breakers to the MX 60 when he disconnected the old pack
> He says the screen is dead and it’s not charging and from conversation with 
> him I believe him.
> We’ve done cold resets and all the normal stuff so far.
>
> Never had to get one of these repaired before, I understand outback doesn’t 
> work on the older stuff
>
> Is there somebody else that repairs these available ?
>
> Thanks
> Bob Ellison
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Re: [RE-wrenches] Residential tracker options

[Lloyd Hoffstatter]

Probably mid afternoon

Get Outlook for iOS

From: RE-wrenches  on behalf of Jay 

Sent: Friday, June 14, 2019 10:48:26 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] Residential tracker options

So zomeworks is done?
Darn

They used propane I believe for a lot of years. I think Freon maybe in the 
early days.

Jay

On Jun 14, 2019, at 1:49 PM, Andrew Truitt 
mailto:atru...@gmail.com>> wrote:


Sulas is pretty new, but I've heard good 
things.  The concept is similar to Zomeworks, but they use paraffin wax instead 
of whatever fluid Zomeworks uses (freon?) with the intention of avoiding 
reliability issues while maintaining the simplicity and positive economics of 
passive actuation.


- Andrew



"Don't get me wrong: I love nuclear energy! It's just that I prefer fusion to 
fission. And it just so happens that there's an enormous fusion reactor safely 
banked a few million miles from us. It delivers more than we could ever use in 
just about 8 minutes. And it's wireless!"

~William McDonough


On Thu, Jun 13, 2019 at 3:13 PM Dave Angelini Offgrid Solar 
mailto:offgridso...@sti.net>> wrote:

Have you looked at the Wattsun HZLA? No ladders and with the right module about 
5KW tracked. Perfect for long hours of cooling or pumping. 
http://www.wattsun.com/products/accutrak-hzla-tracker

Dave Angelini Offgrid Solar
"we go where powerlines don't"
http://members.sti.net/offgridsolar/
e-mail  offgridso...@sti.net
text 209 813 0060

On Thu, 13 Jun 2019 12:46:58 -0400, Dave Tedeyan 
mailto:dtede...@taitem.com>> wrote:

Chris,
We have used AER for trackers. We've had good success with them.
https://www.allearthrenewables.com/product/allearth-solar-trackers

Cheers,
Dave

Dave Tedeyan, PE
Senior Engineer | Taitem Engineering, PC

110 South Albany Street | Ithaca, NY 14850
o. 607.277.1118 x121  f. 607.277.2119
www.taitem.com

Solar • Sustainability • Energy • Design
B-Corporation Best for the World 2018 Honoree

On Thu, Jun 13, 2019 at 12:40 PM 
mailto:ch...@oasismontana.com>> wrote:
Dear people:
Now that Zomeworks is more-or-less down the tubes, what resources do you have 
for a residential tracking system?  Wattsun's 'one size fits all' really 
doesn't (and I don't need a need a lecture of ROI for buying more modules 
versus a tracker).  I'm just wondering if there are more options besides the 
utility grade models.  We have a great pole mount supplier – but some folks 
want a tracker.  I'm looking forward to your responses.
Best,
Chris Daum  





   Oasis Montana Inc.   





406-777-4309


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Re: [RE-wrenches] Hail Damage insurance claim

[Lloyd Hoffstatter]

Intertek and other PV test labs should be able to determine the cause on some 
sample panels.

Best,

Lloyd Hoffstatter
Sunstruck Consulting

Get Outlook for iOS<https://aka.ms/o0ukef>

From: RE-wrenches  on behalf of 
Maverick Brown 
Sent: Friday, June 14, 2019 4:04:12 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] Hail Damage insurance claim

Keywords “their engineers”. He’ll need his own engineers and some lawyers.

Thank you,

Maverick


> On Jun 14, 2019, at 2:31 PM, James Jibril Gustafson  
> wrote:
>
> Hello Climate Heroes,
>
> I have a friend with a large ground-mounted system composed Canadian solar 
> modules and Fronius inverters.  Here on the front range of Colorado we have 
> had increasingly damaging and frequent hail storms. He noticed that some of 
> his modules had broken glass, obviously from hail stones.  Many others had 
> cracked cells and hot spots, which also appear to be hail related.
>
> He asked his insurance company to take a look, and they sent an engineering 
> firm to inspect.  Their report came back saying that only the 3 modules with 
> broken glass would be covered for hail, and that the other 139 modules would 
> not be covered.
>
> Has any one else dealt with a similar situation, and/or have hard evidence 
> that hail can damage a module without breaking the glass?  Any help would be 
> greatly appreciated.
>
> Thanks,
>
> Jibril
> Tava Solar LLC
>
>
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Re: [RE-wrenches] Portable Power Centers

[Lloyd Hoffstatter]

Also try sunwize.com been doing off grid systems for a long time

Lloyd Hoffstatter
Sunstruck Consulting

Get Outlook for iOS<https://aka.ms/o0ukef>


From: RE-wrenches  on behalf of 
Andrew Truitt 
Sent: Sunday, December 9, 2018 2:16 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] Portable Power Centers


Peter - I would contact Faisal at GetChargedUp, they've been doing great things 
with mobile power for 
PR<https://getchargedup.net/empower-emergency/building-a-solar-trailer/>, and 
their based in CA, and they know what they're doing.

Scott Sklar at The Stella Group<http://www.thestellagroupltd.com/> has built 
some very robust mobile solutions for the US military.


A few other options:

http://www.mobilesolarpower.net/

https://www.amerescosolar.com/solar-power-mobile-solutions

https://www.bigdogsolar.com/custom-mobile-solar-trailers/




Regards,


Andrew Truitt
www.dr.ventures
d: 202.486.7507


NABCEP Certified PV Installation Professional ID: 032407-66
Colorado Journeyman Electrician License No.: 600132


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On Sun, Dec 9, 2018 at 10:10 AM Dan Fink 
mailto:danbo...@gmail.com>> wrote:
Every one of these I've seen so fardating back over 10 yearsdrastically 
undersizes the battery bank, I assume because that's the expensive part.

Dan Fink
Professor of Solar Energy Technology, Ecotech Institute
IREC Certified Instructor™ for:
~ PV Installation Professional
~ Small Wind Installer
Executive Director, Buckville Energy
NABCEP Registered Continuing Education Providers™
NABCEP PV Associate

970.672.4342




On Sun, Dec 9, 2018 at 9:21 AM 
glenn.b...@glbcc.com<mailto:glenn.b...@glbcc.com> 
mailto:glenn.b...@glbcc.com>> wrote:
I recently saw a YouTube video that compared 4 or 5 portable power units. You 
might try a search there.

Glenn

Sent from my 'smart' phone so please excuse spelling and typos.

-- Original message--
From: Peter Parrish
Date: Sun, Dec 9, 2018 1:17 AM
To: RE-wrenches;
Cc:
Subject:[RE-wrenches] Portable Power Centers

We are working with Turning Point Foundation a 501(c)3 to provide off-grid 
power for their River Haven project which is providing transitional housing for 
homeless folks in the Ventura CA area.

The site is truly off-grid and currently uses propane to power three 
refrigerators and cook stoves. There is no space heating for the single 
occupancy rooms as of yet. But that’s another problem.

We are looking to specify DC refrigerators and PV-powered battery storage for 
the River Haven project. We are looking at the Goal Zero Yeti-3000 system (3000 
Whr, 500 full discharge cycles, to 80% residual capacity) at a sale price of 
$2,400 but are finding the extra cost of their PV modules quite steep. And 
looking at other 36-cell (12 volt) modules, I can’t find anything for less than 
$1.10/W.

Since Goal Zero is looking at the recreational market, I thought that there 
might be o ther companies with comparable product offerings that are focusing 
on other markets like developing countries.

Any advice would be appreciated and you may contact us off-line.

Peter T. Parrish
SolarGnosis
1107 Fair Oaks Ave. Ste. 351
South Pasadena, CA 91030
(323) 839-6108
peter.parr...@solargnosis.com<mailto:peter.parr...@solargnosis.com>

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Re: [RE-wrenches] Vaccine refrigeration

[Lloyd Hoffstatter]

Also check out SunDanzer 
https://r.search.yahoo.com/_ylt=AwrJ7FSCMutbuckAaSxXNyoA;_ylu=X3oDMTByOHZyb21tBGNvbG8DYmYxBHBvcwMxBHZ0aWQDBHNlYwNzcg--/RV=2/RE=1542169346/RO=10/RU=https%3a%2f%2fsundanzer.com%2f/RK=2/RS=iPLoO5LL4ZF40F4XfCbKPSu2Bi8-

Best regards,
Lloyd
Sunstruck Consulting

Sent from Mail for Windows 10


From: RE-wrenches  on behalf of 
Maverick Brown 
Sent: Tuesday, November 13, 2018 3:22:01 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] Vaccine refrigeration

I recommend the Engel AC/DC frig/freezer. Like the MR040F or similar size. I’ve 
had one running for 6-8 years. No issues.

https://www.engelcoolers.com/shop/12-volt-fridge-freezers/mr040f-u1.html?gclid=EAIaIQobChMIrZe-2pjS3gIVDdvACh0aWQSWEAYYAiABEgIB6PD_BwE

Thank you,

Maverick


On Nov 13, 2018, at 1:26 PM, Jay 
mailto:jay.pe...@gmail.com>> wrote:

Hi all

I’m looking for recommendations on vaccine refrigeration.
It’s for buddy in west pacific which was just pounded by strongest typhoon ever.

Thx
Jay
Peltz Power.
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Re: [RE-wrenches] ANSI-C12.20 compliant meters for PPAs

[Lloyd Hoffstatter]

Jerry,

The Locus meters are a pretty straightforward solution.

Best regards,

Lloyd Hoffstatter
Sunstruck Consulting

Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10


From: RE-wrenches  on behalf of 
Jerry Caldwell 
Sent: Tuesday, November 6, 2018 7:51:43 PM
To: re-wrenches@lists.re-wrenches.org
Subject: [RE-wrenches] ANSI-C12.20 compliant meters for PPAs

Dear Wrenches,

Does anyone have recommendations for low cost, user friendly ANSI-C12.20 
compliant meters? I need one for a project with a PPA and appreciate any advice 
anyone can offer.

Best regards,
Jerry Caldwell
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Re: [RE-wrenches] Troubleshooting Stumper - Homerun Interference in Conduit/Inverter Turning Off/On Rapidly

[Lloyd Hoffstatter]

I was thinking the same, done with battery cables to reduce inductance,
Lloyd

Sent from my iPhone

On Sep 7, 2016, at 10:16 PM, 
"toddc...@finestplanet.com" 
> wrote:


im not sure why i am even suggesting this, but have you tried twisting the 
separate string's pairs before running them through the conduit?



todd










On Wednesday, September 7, 2016 6:55pm, "Matt Partymiller" 
> said:


> Thanks for all the questions and interest in my troubleshooting.
>
> The polarities are definitely correct. When testing wires at the inverter
> with the DC disco off and fuses pulled, we see correct voltage on each
> string.
>
> We have tried using two clamp meters to measure current on each string
> while operating the inverter with our homeruns in the conduit. Using the
> max function we never saw a meter get above about 1.5A (even less earlier
> in the day). String two seemed to be consistently lower but I really
> wasn't sure if that was an inverter function or not as it ramps up towards
> max power. With the homeruns outside of conduit the inverter operates
> fine and both strings show similar, but not identical, current. Doing the
> math it appeared each string was producing roughly half of inverter output
> at that time.
>
> To Jerry's question, the system did operate fine for about a week and 65
> kWh. The inverter then failed. Our technician replaced that inverter
> with a new Solectria 3.8 kW unit, restarted the unit, and noted the
> problem. With Solectria's help he arrived at the idea that we had a
> faulty inverter, got a new one in, and noted the exact same error codes
> and began trying to troubleshoot. He left the third inverter installed
> and also installed a new Tigo Cloud Connect and Gateway for the Trinasmart
> system.
>
> The modules are 255 Trinasmarts with the integral Tigos. The folks at
> Tigo insist the issue is not theirs and, given that either string works
> fine by itself and both strings work fine when not in conduit, I tend to
> believe them. I just don't appreciate how having 20' of undamaged homerun
> wire in conduit as opposed to free air can make an inverter stop
> operating.
>
> Thanks,
>
> Matt
>
>
>
> On Wed, September 7, 2016 8:58 pm, jay wrote:
> > hate to ask the obvious here, but you mean to say that volts and polarity
> > are correct on both sets of wires at the inverter when not connected?
> >
> > and
> >
> > 2. what wattage modules are you using?
> >
> >
> > jay peltz power
> >
> >
> >
> >
> >
> >
> >
> >
> >> On Sep 7, 2016, at 2:45 PM, Matt Partymiller
> >> > 
> >> wrote:
> >>
> >>
> >> Wrenches,
> >>
> >>
> >> One of our systems is having an issue I have not encountered before
> >> where the inverter switches between nighttime mode and interconnection
> >> every few seconds. I am hoping for some technical wisdom from the
> >> community.
> >>
> >> We have an array of 20 TrinaSmart modules in two strings of 10. The
> >> array is connected to a Solectria 3.8 kW inverter. The conduit run is
> >> simple, all four homerun wires (#10 PVwire) in 1" EMT down to the
> >> proximity of the Solectria inverter where the conduit switches to 1"
> >> LFMC before entering
> >> the inverter. The run is about 20', straight down the side of the wall
> >> before hitting the inverter. A 600V jacketed communications wire was
> >> also in the conduit but has since been removed and run separately.
> >>
> >> Our inverter is starting up, running for a few seconds, giving a low
> >> voltage error, briefly showing nighttime mode, then going into startup
> >> mode again. Solectria was gracious enough to send us a new inverter
> >> but we have the exact same issue. They tell us their error codes (266,
> >> 274)
> >> indicate 0 volts. The transition between low voltage error and startup
> >> is almost instant. Basically we have 20 seconds of start up, 5 seconds
> >> of run, 5 seconds of error then repeat. This is not a grid problem, the
> >> identical system next door works fine.
> >>
> >> In the process of troubleshooting, our technician pulled all four
> >> homerun wires out of our conduit and meggered them. They all tested
> >> fine so he connected to the inverter. The inverter worked fine. The
> >> technician verified grounding of the array and conduit, pulled new
> >> homeruns back through the conduit, and reconnected to the inverter. He
> >> had the same error as before.
> >>
> >> He connected each string separately to the inverter by removing the
> >> string fuses. Either string will operate fine independently. With
> >> string one in conduit and either homerun of string two in conduit (but
> >> not both) the inverter operates fine. With string two in conduit but
> >> string one outside of conduit, the inverter does not operate.
> >>
> >> I was certain 

Re: [RE-wrenches] Standing seam metal roof attachments for copper roof

[Lloyd Hoffstatter]

S-5 offers a brass / SS  set screw seam clamp, S-5-B, we have used in the past 
on a copper roof…

Lloyd S. Hoffstatter
M.S. in Applied Solar Energy
NABCEP Solar PV Installer #102503-23

Director
Sunstruck Consulting
ll...@sunstruckconsulting.com
845-657-8132


From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf 
Of Daniel Tittmann
Sent: Tuesday, August 09, 2016 4:53 PM
To: RE-wrenches 
Subject: [RE-wrenches] Standing seam metal roof attachments for copper roof

We have just found out that a project that we have won the contract on had 
chosen a corten standing seam roof that does not support aluminium clips due to 
copper content and potential corrosion of the clips.  Has anyone found a 
cheaper work around than getting a custom Stainless Steel clamp?
Thanks
Daniel

Daniel Tittmann
CTO
Greenwired
www.greenwired.com
dan...@greenwired.com
707-923-2001 (office)
707-206-5088 (Cell)
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Re: [RE-wrenches] SolarEdge 7600 and the Powerwall

[Lloyd Hoffstatter]

That would be great!

Lloyd

Lloyd Hoffstatter
Sunstruck Consulting
ll...@sunstruckconsulting.com<mailto:ll...@sunstruckconsulting.com>




From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf 
Of Howie Michaelson
Sent: Tuesday, June 14, 2016 12:16 PM
To: RE-wrenches <re-wrenches@lists.re-wrenches.org>
Subject: Re: [RE-wrenches] SolarEdge 7600 and the Powerwall


I would love to hear more about that install. Design, sense of equipment 
quality and development (is programming and function well thought out and 
implemented), availability, pictures, etc. are all significant questions. 
Thanks for the offer!

Howie
Howie Michaelson
NABCEP Certified Solar PV Installer™

Sun Catcher
Renewable Energy Systems Sales and Service
VT Solar Electric Incentive Partner
802-272-0004
On Jun 14, 2016 11:45 AM, "Chris Mason" 
<cometenergysyst...@gmail.com<mailto:cometenergysyst...@gmail.com>> wrote:

I just completed a 14KWh Sonnen system for one of our clients if anyone wants 
to know about that system.
On Jun 14, 2016 8:59 AM, "Lloyd Hoffstatter" 
<lhoffstat...@sunstruckconsulting.com<mailto:lhoffstat...@sunstruckconsulting.com>>
 wrote:
Marco,

Thank you, your timing is perfect.  I am working with a utility to get approval 
of a StorEdge  / Solar Edge combination with Tesla batteries and potentially 
export limitation.
The utility has been asking for examples, and this is the first I can bring 
them back.  HECO territory?  Sorry the system isn’t yours, but thanks for 
helping  pave the way for others!

Any other examples of StorEdge with batteries or SolarEdge or StorEdge using 
export limitation would be most helpful, meeting with them on Friday,

Best regards,
Lloyd

Lloyd Hoffstatter
M.S. in Applied Solar Energy
NABCEP Solar PV Installer #102503-23

Director
Sunstruck Consulting
ll...@sunstruckconsulting.com<mailto:ll...@sunstruckconsulting.com>
845-657-8132


From: RE-wrenches 
[mailto:re-wrenches-boun...@lists.re-wrenches.org<mailto:re-wrenches-boun...@lists.re-wrenches.org>]
 On Behalf Of Marco Mangelsdorf
Sent: Monday, June 13, 2016 11:43 PM
To: 'RE-wrenches' 
<re-wrenches@lists.re-wrenches.org<mailto:re-wrenches@lists.re-wrenches.org>>
Subject: Re: [RE-wrenches] SolarEdge 7600 and the Powerwall

Yes, Howie…their SE StorEdge.

Not my install.  Sunrun did it on Oahu.  Did a big press whoopdeedo and even 
got the governor of Hawaii and mayor of Honolulu to attend.

marco

From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf 
Of Howie Michaelson
Sent: Monday, June 13, 2016 4:55 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] SolarEdge 7600 and the Powerwall


Hi Marco,
I assume that is the StorEdge 7600? Is this your install? What was your access 
to the StorEdge?

Thanks for the photo,
Howie
Howie Michaelson
NABCEP Certified Solar PV Installer™

Sun Catcher
Renewable Energy Systems Sales and Service
VT Solar Electric Incentive Partner
802-272-0004
On Jun 13, 2016 9:29 PM, "Marco Mangelsdorf" 
<ma...@pvthawaii.com<mailto:ma...@pvthawaii.com>> wrote:
>
> Provides an idea of size and scale.
>
> From left to right—disconnect, kWh meter, SolarEdge 7600, switch gear, two 
> Tesla Powerwalls.
>
>

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Re: [RE-wrenches] SolarEdge 7600 and the Powerwall

[Lloyd Hoffstatter]

Marco,

Thank you, your timing is perfect.  I am working with a utility to get approval 
of a StorEdge  / Solar Edge combination with Tesla batteries and potentially 
export limitation.
The utility has been asking for examples, and this is the first I can bring 
them back.  HECO territory?  Sorry the system isn’t yours, but thanks for 
helping  pave the way for others!

Any other examples of StorEdge with batteries or SolarEdge or StorEdge using 
export limitation would be most helpful, meeting with them on Friday,

Best regards,
Lloyd

Lloyd Hoffstatter
M.S. in Applied Solar Energy
NABCEP Solar PV Installer #102503-23

Director
Sunstruck Consulting
ll...@sunstruckconsulting.com<mailto:ll...@sunstruckconsulting.com>
845-657-8132


From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf 
Of Marco Mangelsdorf
Sent: Monday, June 13, 2016 11:43 PM
To: 'RE-wrenches' <re-wrenches@lists.re-wrenches.org>
Subject: Re: [RE-wrenches] SolarEdge 7600 and the Powerwall

Yes, Howie…their SE StorEdge.

Not my install.  Sunrun did it on Oahu.  Did a big press whoopdeedo and even 
got the governor of Hawaii and mayor of Honolulu to attend.

marco

From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf 
Of Howie Michaelson
Sent: Monday, June 13, 2016 4:55 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] SolarEdge 7600 and the Powerwall


Hi Marco,
I assume that is the StorEdge 7600? Is this your install? What was your access 
to the StorEdge?

Thanks for the photo,
Howie
Howie Michaelson
NABCEP Certified Solar PV Installer™

Sun Catcher
Renewable Energy Systems Sales and Service
VT Solar Electric Incentive Partner
802-272-0004
On Jun 13, 2016 9:29 PM, "Marco Mangelsdorf" 
<ma...@pvthawaii.com<mailto:ma...@pvthawaii.com>> wrote:
>
> Provides an idea of size and scale.
>
> From left to right—disconnect, kWh meter, SolarEdge 7600, switch gear, two 
> Tesla Powerwalls.
>
>
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Re: [RE-wrenches] Glue-on type modules

[Lloyd Hoffstatter]

Howie,

Take a look at the MiaSole site.  Not sure how they are set up RE sales / dist.

Best Regards,
Lloyd

Lloyd S. Hoffstatter
M.S. in Applied Solar Energy
NABCEP Solar PV Installer #102503-23

Director
Sunstruck Consulting
ll...@sunstruckconsulting.com
845-657-8132


From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf 
Of Howie Michaelson
Sent: Thursday, March 24, 2016 4:08 PM
To: RE-wrenches 
Subject: [RE-wrenches] Glue-on type modules

Hi all,

It has been years since I used Uni-solar PVL modules and have had little call 
for or interest in amorphous glue-on modules, so I'm a bit out of the loop.  
Does anyone know anything about that market?  I've searched the archives and 
see no recent references, and the only thing I can find on the web are old 
Uni-solar modules on Amazon.


Thanks,
Howie Michaelson
NABCEP Certified Solar PV Installer™
Sun Catcher, LLC
Renewable Energy Systems Sales and Service
VT Solar Electric Incentive Partner
802-272-0004
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Re: [RE-wrenches] Generator backfeeding enphase?

[Lloyd Hoffstatter]

We have tied in the PV to operate when the generator is operating, but only on 
a very large generator when the PV output was very small compared to both 
generator output and load (in which case it apparently looked like a reduction 
in load the to the genset, and actually saved some fuel).  But I agree that 
there is significant potential for damage to the generator controls, etc., and 
would not validate or recommend it.

Solectria has a nice white paper on the subject:

http://solarprofessional.com/articles/products-equipment/inverters/q-a-interaction-of-grid-direct-inverters-with-backup

Also, discussions we’ve had with Enphase have been that it may be possible but 
would void the inverter warranty, which may well be the case with other 
inverter manufacturers.

Best regards,
Lloyd Hoffstatter
NABCEP PV Installer, NY-Sun trainer

From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf 
Of jay
Sent: Tuesday, October 20, 2015 12:37 PM
To: RE-wrenches <re-wrenches@lists.re-wrenches.org>
Subject: Re: [RE-wrenches] Generator backfeeding enphase?

I don’t think you are missing anything.
jay

On Oct 20, 2015, at 9:01 AM, Howie Michaelson 
<ho...@suncatchervt.com<mailto:ho...@suncatchervt.com>> wrote:

Does anyone think that there is no issue with having enphase potentially 
backfeeding a backup generator? We almost always will tie in upstream of a 
generator transfer switch, but a competitor is telling clients with an enphase 
system there is no concern. Am I missing something?
Thanks,
Howie
Howie Michaelson
NABCEP Certified Solar PV Installer™
Catamount Solar
Renewable Energy Systems Sales and Service
VT Solar Electric Incentive Partner
http://www.CatamountSolar.com<http://www.catamountsolar.com/>
802-272-0004


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Re: [RE-wrenches] Rooftop DC disconnects

[Lloyd Hoffstatter]

Wrenches,

UL has done testing on various materials for use as array covers, and lists 
their results. While perhaps not too practical as a means of shutting down a 
working system, this can be one of firefighters’ only effective methods when a 
fire has occurred and has damaged modules until PV pros arrive to disable 
system (UL tests have also shown destroyed modules still can produce high 
voltage).

Regards,
Lloyd Hoffstatter
NABCEP PV Installer
NY-Sun instructor



From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf 
Of William Miller
Sent: Thursday, September 24, 2015 1:06 PM
To: RE-wrenches <re-wrenches@lists.re-wrenches.org>
Subject: Re: [RE-wrenches] Rooftop DC disconnects

Brian:

I agree 100%. Handling a tarp on a roof is impractical, ineffective and 
unreliable. Wind and slope are just two factors that increase danger and reduce 
reliability.

William


On Sep 24, 2015, at 9:12 AM, Brian Mehalic 
<br...@solarenergy.org<mailto:br...@solarenergy.org>> wrote:
I disagree about tarps. We've tested fully covered arrays (and small ones at 
that) and still had what would be considered lethal levels of current and 
voltage, even when using heavy, reflective tarps. And it can be very difficult 
to ensure they stay in place, plus it's impractical for larger arrays.

Brian

On Sep 24, 2015, at 6:31 AM, Jason Szumlanski 
<ja...@floridasolardesigngroup.com<mailto:ja...@floridasolardesigngroup.com>> 
wrote:
"​In this scenario, there is no safe way to replace either of the two 
Morningstar controllers."

The BEST rooftop disconnect remains... a big thick tarp. Not totally practical 
in an emergency situation, but it is pretty fail safe.

Unfortunately for emergency responders, that does not take care of the AC 
circuits in a microinverter or AC module system, but ideally the building main 
is shut down anyway, and the risk is the same as any other 240V 
equipment/appliance circuits.

​Jason Szumlanski



On Wed, Sep 23, 2015 at 4:26 PM, William Miller 
<will...@millersolar.com<mailto:will...@millersolar.com>> wrote:
Dear Fellow Wrenches

Below is a design conundrum that may resonate with some of you:

We are finalizing a design for an off-grid residential system.  The customer 
insist the PV should be on the roof and pre-installed a 1-1/4” PVC conduit from 
his roof to a crawl space, in anticipation of a solar install.  This created 
real problems, because we all know we can’t pull PV source or output circuits 
in (or now, on)  the envelopes of habitable buildings.

There was no practical way to replace the PVC.  We contrived a method to sleeve 
¾” liquid-tight through the 1-1/4” PVC to the crawl space, continuing on with 
EMT.  This is the largest metallic conduit we could fit.  The distance was 
greater than 10 feet so we couldn’t use EMT.  Due to the conduit size 
restriction, we upgraded to Morningstar 600 volt charge controllers, allowing 
us to reduce conductor size.

(As a sidebar, although the Morningstar is listed as a 600 volt charge 
controller, we have found no circumstance were we could take advantage of that 
high a voltage.  With the currently available high wattage modules, by the time 
we added enough in series to get to 600 volts, we were well beyond the wattage 
capabilities of the controller.  For sake of design considerations, I suggest 
one regard these units as ~300 volt charge controllers.)

We now have plans for 300 volt PV feeders running down an interior wall and 
under the house, with no roof-top disconnecting means.  It is my understanding 
none are required.  I am not comfortable with this.
​​
In this scenario, there is no safe way to replace either of the two Morningstar 
controllers. Should someone drill through or damage the EMT in the wall or 
under the floor, there would be no way to turn off the feeder.

I don’t like putting HU361RBs on a roof.  They must remain vertical and so they 
stick up too high and are hard to provide mounting for.  Sola-deck units are 
another option, but they require integrating with shingles, not practical on 
this job or many others.  I finally settled on a DC-Sunvolt PV-X16A-4X-RG 
disconnect as a possible solution.  At $216 it is not out of range.  The unit 
will provide means to turn off the feeders for service.  I will report back on 
my impressions of the unit.

To distill this scenario, I don’t believe the code requires a disconnect, but I 
feel morally obligated to install one.  I’d be interested in verification of 
the code interpretation and others response to similar situations.

I found no other options for rooftop disconnecting means that would be small, 
reasonably priced and not present a high profile.  If there are products I 
don’t know about, I would be most grateful to receive your input.

While researching the hardware I stumbled upon this article, linked below.  It 
seems to present a real dilemma, but I am not convinced.  Please remain 
skeptical 

Re: [RE-wrenches] Rooftop DC disconnects

[Lloyd Hoffstatter]

Thanks Glenn, that’s the one – there are also some UL videos showing the tests 
and the results, sobering yet valuable information.

Under the NY-Sun program, we are both training and listening to firefighters in 
the attempt to provide practical information for working around PV systems and 
ultimately how to provide safety in the aftermath of an event.  As shown in the 
UL report,  4 or 6 mill black plastic is opaque enough to provide voltage 
reduction to safe levels when fully covering the array.  For fire companies 
that already carry clear plastic and clamps to cover venting skylights, the 
switch to black is a simple and inexpensive example of same.

Best regards,

Lloyd Hoffstatter

From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf 
Of Glenn Burt
Sent: Thursday, September 24, 2015 6:08 PM
To: 'RE-wrenches' <re-wrenches@lists.re-wrenches.org>
Subject: Re: [RE-wrenches] Rooftop DC disconnects

http://websites.firecompanies.com/njiaai/files/2014/04/PV-FF_SafetyFinalReport.pdf

I think this is the report Lloyd referred to.

I used it this spring during a firefighter training class I taught. It has a 
lot of interesting information.

-Glenn

From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf 
Of Jason Szumlanski
Sent: Thursday, September 24, 2015 2:26 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] Rooftop DC disconnects

Interesting. I'd like to get a hold of those test results.

It is not always practical, but I have never had an issue using opaque 
black-out type tarps (of course - testing for voltage is a critical safety 
step). The flimsy blue stuff will definitely not work. At one time I had a 
sports field cover, but it was too heavy to manage. Then again, we deal with 
low-slope roofs around here, making roofs easily walk-able. I challenge the 
assertion that it's ineffective and unreliable. Practical? Judgment call. How 
effective is a disconnect at de-energizing the conductors between the array and 
the disconnect itself?

There are many module and inverter manufactures that prescribe opaque covers 
while conducting wiring operations in their manuals. Here are some other 
resources that point to this same method for "shutting down a PV system" 
including:

Home Power
http://www.homepower.com/articles/solar-electricity/equipment-products/pv-safety-and-firefighting

Fire Engineering:
http://www.fireengineering.com/articles/print/volume-162/issue-5/features/solar-electric-systems-and-firefighter-safety.html



On Thu, Sep 24, 2015 at 2:19 PM, Lloyd Hoffstatter 
<lhoffstat...@sunstruckconsulting.com<mailto:lhoffstat...@sunstruckconsulting.com>>
 wrote:
Wrenches,

UL has done testing on various materials for use as array covers, and lists 
their results. While perhaps not too practical as a means of shutting down a 
working system, this can be one of firefighters’ only effective methods when a 
fire has occurred and has damaged modules until PV pros arrive to disable 
system (UL tests have also shown destroyed modules still can produce high 
voltage).

Regards,
Lloyd Hoffstatter
NABCEP PV Installer
NY-Sun instructor



From: RE-wrenches 
[mailto:re-wrenches-boun...@lists.re-wrenches.org<mailto:re-wrenches-boun...@lists.re-wrenches.org>]
 On Behalf Of William Miller
Sent: Thursday, September 24, 2015 1:06 PM
To: RE-wrenches 
<re-wrenches@lists.re-wrenches.org<mailto:re-wrenches@lists.re-wrenches.org>>
Subject: Re: [RE-wrenches] Rooftop DC disconnects

Brian:

I agree 100%. Handling a tarp on a roof is impractical, ineffective and 
unreliable. Wind and slope are just two factors that increase danger and reduce 
reliability.

William

On Sep 24, 2015, at 9:12 AM, Brian Mehalic 
<br...@solarenergy.org<mailto:br...@solarenergy.org>> wrote:
I disagree about tarps. We've tested fully covered arrays (and small ones at 
that) and still had what would be considered lethal levels of current and 
voltage, even when using heavy, reflective tarps. And it can be very difficult 
to ensure they stay in place, plus it's impractical for larger arrays.

Brian

On Sep 24, 2015, at 6:31 AM, Jason Szumlanski 
<ja...@floridasolardesigngroup.com<mailto:ja...@floridasolardesigngroup.com>> 
wrote:
"​In this scenario, there is no safe way to replace either of the two 
Morningstar controllers."

The BEST rooftop disconnect remains... a big thick tarp. Not totally practical 
in an emergency situation, but it is pretty fail safe.

Unfortunately for emergency responders, that does not take care of the AC 
circuits in a microinverter or AC module system, but ideally the building main 
is shut down anyway, and the risk is the same as any other 240V 
equipment/appliance circuits.

​Jason Szumlanski



On Wed, Sep 23, 2015 at 4:26 PM, William Miller 
<will...@millersolar.com<mailto:will...@millersolar.com>> wrote:
Dear Fellow Wrenches

Below is a design conundrum that may resonate wit