I have had two of these on my house (I upgraded my system, so had to get
a larger model) and I really like them. Great guys at the company and
great product. Major issue is that most utilities don't have a blanket
allowance for meter collars like this one, so you may end up spending a
fair
I learned in a Xantrex GT training (way back) that their 36 bottom
clearance requirement was to avoid [most] lawn sprinklers, so that may
be the case here too. I'd still plan for it to be high enough to avoid
any basement flooding and to remain easy to access. May be worth
discussing with SMA
I think someone here long ago recommended solarscrim.com; when I
recommended it to three contractors I heard:
1) awesome, I just bought some and I'll use this on every project!
2) too expensive, I'm getting some tennis court screening on my own and
doing it myself.
3) too expensive, I'm
SAM is what you're looking for:
https://sam.nrel.gov/
I didn't have much luck last time I tried to import TOU utility data,
but you can enter your parameters manually if the auto-import doesn't
work for you.
Dave
On 2015/4/8 16:15, Mick Abraham wrote:
Hello, Mechanix~
A client requested a
All, please excuse the late addition to the thread, but I just noticed
that SMA has a PDF up describing their Rapid Shutdown solution. I think
it's just been uploaded in the last few weeks, so in case you hadn't
seen it:
Regarding the clipping, which the power electronics guys would rather I
call power limiting...
To be clear, Longer 100% production around noon (implied in that image
that this is somehow beneficial) means this system could have produced
more energy but didn't because the inverter was too
Mark-
690.56(C) provides the placard you're looking for and 690.56(B) tells
the first responder where that 690.12 switch is, right?
For 2017 there are a couple of proposals out there. One is trying to
better educate that first responder (quickly!) as to what hazards exist.
Another is
The inverter to generator ratio is entirely the designer's call and
comes into play for large generators (for residential systems as
mentioned in earlier replies, it's a bad idea).
Interconnecting in spot networks in dense urban areas has a similar
issue in that the distribution system can't
Bill, typically inverters have a max OCPD that can be installed on their
output, and these sizes are generally not large enough to accommodate
two same-model inverters. And manuals often note that you need to have a
dedicated OCPD anyway. At least if I were ever to double-up two
inverters on a
I believe that I was told in a 2005-ish Xantrex GT training that their
minimum clearance (~30) requirement came from the need to be above lawn
sprinklers. I can't remember offhand seeing this reason given in any
recent manual, so any bottom clearances required in the manual may apply
to you
I think that someone on this list recommended Solar Scrim a while back
to make the conductors no longer readily accessible after they're
supported; two options, depending on how picky the QA inspector is.
http://www.solarscrim.com/
DKC
On 2014/10/12 10:55, Christopher Warfel wrote:
I looked
There is some pressure on NM specifically to postpone adoption of 690.12
until more products are available, so that may help you out. To my
knowledge, micro-inverters don't need to comply with 705.12(D)(6) since
there are no suitable products available [90.4]. Equipment does need to
be listed,
And... after seeing boB's email I realize that my last sentence is
incorrect given the existence of the MNPVHV8-DLTL-3R for exactly this
purpose.
DKC
On 2014/10/9 15:29, Dave Click wrote:
There is some pressure on NM specifically to postpone adoption of
690.12 until more products
William,
Just to pile on here, if you're running 4 pairs of low-voltage dc for
400' you may be better off just sticking the inverters right there at
the array and making the long run as 240Vac. #2s on each inverter output
(22A?) would work, keeping voltage drop to 1.3%. If you choose to
Flipping through the '04 plumbing code I see a few slopes called out
(1/4 per 1' for fixture vents, 1 per 1' for circuit vents, 1/2 per 1'
for combination drain/vent...). Fixture vents have a maximum distance of
a few feet from fixture trap to vent, but I don't think this prevents
you from
While I share Robin's optimism, I should also note the NEC 2017 690.12
committee referred to is not the code making panel. While it does have
(at least) one firefighter representative among a majority of PV
industry personnel, there's no guarantee that the Code Making Panel
approves this
I don't have that reference, but I believe that IFC 608 only comes into
play with large banks with 50+ gallons of electrolyte.
On 2014/7/29, 14:10, Glenn Burt wrote:
Also look to see if the fire code in your state has additional
restrictions.
In New York Stat, the 2010 Fire Code contains
Mac, that Island interconnects with a max 70A 1P breaker (6.7kW
continuous), so unless they have a constant critical load draw or the
Fronius is massively oversized, you probably don't want to AC couple the
Fronius. The 5048 is also able to output a continuous 5000W only when
it's cooler than
Jason, I think they were re-branded Eaton inverters. Unlike the modules,
they were actually UL listed...
On 2014/6/30, 16:13, Jason Szumlanski wrote:
Does anyone know who manufactured the PV250 inverters from ASP before
they went under? Are they private labeled inverters manufactured by
Thanks to Nick for catching a misstatement in my email, corrected below
in *bold*. I was trying to make a general statement out of his specific
situation.
On 2014/6/26, 10:20, Dave Click wrote:
NEC says 10' from the array, defined as A mechanically integrated
assembly of modules or panels
NEC says 10' from the array, defined as A mechanically integrated
assembly of modules or panels with a support structure and foundation,
tracker, and other components, as required, to form a direct-current
power-producing unit. 70HB14_CH00_FM_pi_xii.pdf I take this to mean
that the array
As an update- the system used at this install turned out to be a
currently-available product called SolAttach:
http://www.solattach.com/
On 2014/6/3, 11:11, Dave Click wrote:
Jason, thanks for the comment! I agree that systems could connect to
just sheathing and stay on the roof- I think
Corey,
The line of reasoning is faulty. It's 705.12(D)(1). Micro-inverters are
the exception because they are specially listed to share a breaker. As
for the other inverters, doubling them up on a single breaker /
disconnect probably goes against their installation instructions
[110.3(B)]
be good for about
5kW of solar.
Jason Szumlanski
Fafco Solar
On Tue, Jun 3, 2014 at 9:06 AM, Dave Click davecl...@fsec.ucf.edu
mailto:davecl...@fsec.ucf.edu wrote:
Hi all,
Anyone know what this racking system is? The permit drawings say
Unirac with lag screws and Eco-Fasten flashings
This may be useful:
http://www.cobrawire.com/lugs/lugs.php?cat=xflex
On 2014/4/30, 14:25, William Miller wrote:
Ray:
Thanks for sharing the research. If you could forward to me of-line an
email contact and part number I need to order for 4/0.
Miller Solar
On Apr 30, 2014, at 10:22 AM,
I think 240.24(A)(4) allows the installation of the inverter OCPDs in
the SolaDeck hidden under a module.
** *240.24 Location in or on Premises.*
** National Electrical Code 2008 Edition *(A) Accessibility.*
Overcurrent devices shall be readily accessible and shall be installed
so that the
Nathan, 690.12 only applies to PV system circuits installed on or in
buildings so that might be your answer. You'd only be affected by
690.12 if you're running to an interior inverter. So- your strategy of
exterior conduit to wall-mounted inverters on the exterior of a building
won't be
If you also have the local electricians selling the kvar units as
surefire ways to save 30% on your electric bill, I'd nominate that as
myth/scheme/scam, though I hope most of those resellers are doing so
only because they're naive. There was also some absurd company a few
years ago which was
Karl, you're interconnecting into a spot/area network, right? It's a
real concern; some solutions and background on the issue here:
http://www.nrel.gov/docs/fy09osti/45061.pdf
DKC
On 2014/3/27, 14:05, Karl Jaeger wrote:
Esteemed Wrenches,
We've recently run into an issue with a local
I had a nice response all typed up before rediscovering my original
source. Simple answer: there's still a thermal load to deal with even
though there's no point on the bus seeing a current above the busbar
rating. I am a linking machine today:
] *On Behalf Of
*Dave Click
*Sent:* Thursday, March 27, 2014 1:29 PM
*To:* re-wrenches@lists.re-wrenches.org
mailto:re-wrenches@lists.re-wrenches.org
*Subject:* Re: [RE-wrenches] Fault Current
Karl, you're interconnecting into a spot/area network, right? It's a
real concern; some solutions
Hi Wrenches-
If you're installing 1000V systems, are you running continuous PV WIRE
all the way to your inverters? If not-- what splices have you found
(aside from MC4s and similar) that are listed for 1000V? And when
transitioning from PV WIRE to a cheaper conductor, what 1000V options
Dan,
690.10(C) doesn't say no. It says that if you have a single 120V
inverter output connected directly for a 120/240 panel then you can't
put a 240V load in the panel-- in this case you'd either have L
connected to both phases of the panel or I guess you could just use half
the breakers in
All,
I think that in the past, list discussions have talked about fusing of
parallel battery circuits as a best practice, but it's required per
690.9 right? (text below from 2008 NEC)
Also, if someone (don't look at me) really wants to use 2 parallel
circuits of 12V batteries, what
A colleague found this online the other day as one potential option for
shielding the wires for a ground-/pole-mount system:
http://www.solarscrim.com/index.php
No personal experience, though. Looks like they may ship with black zip
ties but Sunbundler ties (or others) would be an easy swap.
I would think this would be fine, so maybe I am missing the issue. Does
CA have a state-specific rule on this? What you're asking is whether you
can safely install a 40A inverter circuit in each of your interior
[200-225A] panelboards fed from this meter main, right? This is two
separate
Has anyone checked out the NEC in Enhanced E-Book form? Is it worth
buying rather than the PDF? I'm guessing that the E-Book format cripples
it and makes it incredibly annoying to use, but figured I'd ask.
Thanks- have a great weekend all.
DKC
___
** *300.3(B) Conductors of the Same Circuit.* All conductors of the same
circuit and, where used, the grounded conductor and all equipment
grounding conductors and bonding conductors shall be contained within
the same raceway, auxiliary gutter, cable tray, cablebus assembly,
trench, cable, or
There are similar systems available to this one. I think you mean that
the inverter is UL 1741, but the system is not grid-interactive.
Stand-alone inverters can be listed to 1741 as well.
IIRC, when I saw them at SPI 2012 they were doing everything in DC. They
may have switched to AC so they
William, for quick estimates I usually use www.pvselect.com which uses
high ambient+30C for its VMP calcs.
On 2013/9/27 1:01, William Miller wrote:
Friends:
Do any of you know any good, on-line tools for calculating temperature
compensated string voltages? I looked but I can't find one. I
Eaton just announced some safety switches with shunt trip that may work
for you- Google: Eaton TD008003EN to get the datasheet.
TD008003EN
On 2013/9/24 11:12, Karl Jaeger wrote:
Greetings Esteemed Wrenches,
We are building a 35.75kW project with (6) Power One 6000's. The
service is a 240
I think Gary may be overthinking this. If the micro-inverters have a GEC
lug then you'll need to run a GEC.
If you run your GEC to a ground rod, then you don't need to use one
larger than #6 per 250.166(C). (note also (D) and (E) but they're less
useful to you here)
/
Commentary:/
It makes
, 2013, at 3:11 PM, Dave Click davecl...@fsec.ucf.edu wrote:
Have folks been having good experiences with the SMA Bluetoothed WebBox, or
should I stick with the standard 485 edition? I'm guessing it'll be about a 20'
max triangle between the SB1TL, WebBox, and SensorBox. Likely using
Have folks been having good experiences with the SMA Bluetoothed WebBox,
or should I stick with the standard 485 edition? I'm guessing it'll be
about a 20' max triangle between the SB1TL, WebBox, and SensorBox.
Likely using a Sprint modem for the internet connection.
Thanks in advance and
Allan- SMA tech support confirmed with me yesterday that the 3/4/5 kW TL
units are compatible with the SMA frequency shifting.
On 2013/8/2 16:34, Allan Sindelar wrote:
Will the Sunny Island mate up with these Sunny Boys that have the
limited backup capability during an outage, as they will
The obvious disclaimers of course apply to this message...
The only time a customer would find out that they were disallowed is
if they are audited, right?
Anyway, from the 5695 form sent out earlier, emphasis added:
Qualified solar electric property costs. Qualified solar electric
property
I think that the 230s required positive grounding, so you can't swap out
the inverter for a TL unit. These two circuits in parallel will be fine
for your MPPT, you'll have essentially the same voltages but slightly
higher current in your new second string.
DKC
On 2013/7/12 19:27, August
All these manufacturers making cable clips are going to be so upset when
they learn that we know about this quick, cost-effective wire management
method!
You could start with 110.3(B) where the module installation manual may
prohibit anything adhered to the back of the module.
Or
-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org
mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of
Dave Click
Sent: Wednesday, July 03, 2013 6:26 AM
To: RE-wrenches
Subject: [RE-wrenches] EGC for Enphases
All,
I was just
All,
I was just looking at small 4-module Andalay (Enphase 190) system tying
into one of the Lennox solar-ready air conditioners. The engineer had
specified the 690.47(C) GEC be run directly from the array down to the
existing electrode. Running from the inverters is a 2+G wire to the
Lennox
690.35(D) does *not* require PV WIRE be used for the whole dc circuit.
You can use either: (quoting directly from 2008)
1) Nonmetallic jacketed multiconductor cables
2) Conductors installed in raceways, or
3) Conductors listed and identified as PV WIRE installed as exposed,
single conductors
Unfortunately, the benefits are somewhat limited since you still have to
size the neutral at the same size as your EGC, and you have to upsize
your EGC thanks to your voltage drop. So now instead of a #6 neutral,
you're running them as 8s? Hey, every bit helps...
On 2013/6/20 16:18, Drake
As a quick clarification- SolarEdge requires PV WIRE per 690.35. Regular
USE-2 doesn't work for these systems.
On 2013/6/15 7:25, SwingJunkie wrote:
Marco,
We installed our first Enphase system in December 2009, and our last
in December 2011, when their high failure rate became a problem.
Jeff,
This has been sent out on the list a few times but I don't remember
anyone sharing their personal experiences with it:
http://solarprofessional.com/articles/products-equipment/product-launches/milbank-offers-load-tap-connector
200+ 60 for a meter main is trickier. The $1100 (list)
Actually, one is the manufacturer closest to you, Paul- the Solectria
SGI 225-500kW class does a 600VAC output.
On 2013/5/15 14:03, Paul Lyons wrote:
Stump the RE-Wrenches:
You know the NPR radio show, Car Talk, when they play Stump the
Chumps? I visited a manufacturing plant last week
At SPI last year there was at least one company offering this, and
there's another company from Tallahassee also looking into it:
www.usa-eds.com
I'm not an expert by any means but I think that even 120F doesn't kill
legionella-- you need to get to 140F. And even if you do 140F, I imagine
Another option would be to compensate the customer for lost production
until you're out there to replace a second inverter. You can credit this
against Jason's diagnostic fee idea and/or the $150/unit reimbursement
from Enphase. Each unit down is about $30-60/year depending on location.
Could
Wrenches will especially enjoy the IMP and ISC values, pictured in the
final image of the UL notice.
On 2013/4/16 13:29, Jason Szumlanski wrote:
Ray Johnson in Florida has done an excellent job documenting this
fiasco on his blow in the article below and several other articles.
I don't believe this would work; official metal-clad cable would, but
not armored cable. Metal-clad only works under the 2011 NEC, and only
then when it meets 250.118(10).
On 2013/4/11 19:24, Hilton Dier III wrote:
I asked this one last year and got a few That's interesting responses,
but
What problems is the system having?
Regarding your proposed 3P wiring solution, I don't know whether this
has been fixed recently, but Outbacks in 3P historically haven't
monitored the angle between phases. Under grid-connected operation it's
not a problem, but after they lose the grid
Marco,
I still challenge those who believe that “some clipping is good” to make their
case.
Well, the way you've phrased it, you've made my job pretty easy-- though
it seems to me that several folks have already done this for you.
Some power limiting at some point over the 25-year life of
http://www.smainverted.com/2013/02/21/groundbreaking-new-feature-on-sunny-boy-tl-us-emergency-power-when-the-grid-fails/
On 2013/3/25 11:56, Nik Ponzio wrote:
Forgive my senility. I recently read somewhere about development of
grid-tie inverters without batteries that offer emergency power via
As a note, supply side connections have an extra complication with
battery backup systems. With a regular GT inverter you're just pushing
current into that interconnection point and you can work out easily that
you won't have any overcurrent issues unless you made a big mistake and
your
This could just be due to the better temperature coefficient, or maybe
they do slightly better than cSi at lower irradiance levels?
Solar Frontier CIS: -0.31%/degC
SolarWorld poly: -0.45%/degC
I don't know enough about CIS to comment on the light soaking.
On 2013/2/18 8:36, Marco Mangelsdorf
For these installations, do you guys have more information on the
utilities' protocols that are causing problems with these inverters?
On 2013/2/5 12:51, penobscotso...@midmaine.com wrote:
Will do. Enphase had originally projected the beginning of February for
the release of the fix. It is now
That's correct, it's a 57.0 - 60.5 Hz operating window.
http://www.heco.com/portal/site/heco/menuitem.508576f78baa14340b4c0610c510b1ca/?vgnextoid=12a290a2decab110VgnVCM105c011bacRCRDcpsextcurrchannel=1#bk6
According to that website, the requirement only applied to systems
interconnected
Jason,
There's a 2009 Broward County interpretation that you should be able to
use for some leverage:
See Page 23 (or search for solar)-
http://www.broward.org/CodeAppeals/Documents/FIWebDoc.pdf
Obviously, it's difficult to move an 8000 pound chiller off a roof to
reroof beneath it, whereas
Daryl,
I don't think there's a practical way to make this work either. If you were
adding a 500kW load to that site, the utility would gladly bring out a
three-phase transmission line with an appropriate transformer.
Unfortunately, for a solar farm, the utility probably wouldn't be willing
to do
Well summarized. I think your mileage would vary based on the
anti-islanding algorithm used in the inverter and the generator's
ability to regulate frequency. So while it may work in that an
inverter syncs to a small generator's output, it's very unlikely that
reverse current backfed into the
Jason, for 9-11 year-olds this curriculum may be useful as a starting
point, and we've got some others for different age groups.
http://fsec.ucf.edu/en/education/k-12/curricula/sm2/index.htm
The solar powered system experiment is designed for a cell so we
suggested the load be a small
Hi all,
Just passing along a correction from Solectria on this issue. Since Dec
2010 these inverters have had a 205V+ window; apparently these units
just had an old label on them.
Dave
On 2012/11/29 9:39, Dave Click wrote:
Hi all,
I did an inspection recently that had 3 Solectria PVI13kW
Hi all,
I did an inspection recently that had 3 Solectria PVI13kW units
installed. I was surprised to note that the MPPT window on the nameplate
was 225-380VDC, as the online spec sheet and manuals all note a
205-385VDC window. When I asked tech support about this, they replied
that the
Carl, you may also be interested in HOMER-- free 2-week trial available
of the latest version (after that, $99 per 6-month renewal, despite zero
updates since Nov 2010). There's also the free legacy version that's a
few years old.
http://homerenergy.com/
On 2012/11/26 22:40, Carl Adams
I would agree that the imbalance at these power levels is not a major
issue. If it appears that Phase A is most heavily-loaded, I'd install
the inverters as A-B and A-C to help mitigate the existing imbalance. If
you've got a lot of 1P loads on a 3P service-- lighting, office
receptacles or
Nick, what the AHJ is telling you may actually be in reference to
250.97; for most PV output circuits (yes these are necessarily dc) this
bonding requirement applies since array VOC 250 VDC. As Kent just
pointed out, these dc conductors clearly don't meet the NEC definition
of a service.
DraftSight is a free AutoCAD clone (not just for Mac) that may be what
you're looking for.
On 2012/10/22 13:37, Jason Szumlanski wrote:
I don't know if you want a 3D modeling program, but Sketchup is free and
incredibly powerful. There is a Pro version also available with more
advanced tools.
This is possible because they have cell-level MPPT. I'd guess that even
when the sun is perpendicular to the module you'd have a [tiny] bit of
extra current from diffuse light reflected onto the module, and you'd
see more substantial gains from reflection if the sun can see the
reflector and
Erika, I think the takeaway here is that the Island only has that surge
power capacity on the protected load side- you wouldn't see this surge
on the utility side. SMA should be able to provide this sort of
documentation for you.
On 2012/10/18 9:38, Erika Weliczko wrote:
Greetings all.
I
Check out the new SMA Smartformer, though I'm not sure whether it's
actually shipping yet. I'm thinking about this for my house eventually
(SB5000US).
http://www.sma-america.com/en_US/products/off-grid-and-back-up-solutions/smartformer-for-sunny-island.html
Alternatively, the new SMA TL
Good input on the Atlantis options-- does anyone have experience with
the www.bipvinc.com or www.lumetasolar.com products?
On 2012/10/2 13:06, Robert Evans wrote:
I installed the BOS for an Atlantis Sunslates system back in 2003-04,
and commissioned the system. Based on my experience I
, dirty dirty
Holt E. Kelly
Holtek Fireplace Solar Products
500 Jewell Dr.
Waco TX. 76712
254-751-9111
www.holteksolar.com
- Original Message - From: Dave Click davecl...@fsec.ucf.edu
To: re-wrenches@lists.re-wrenches.org
Sent: Tuesday, October 02, 2012 1:22 PM
Subject: [RE-wrenches] BIPV
Mr. Brooks had an email on this topic on 5/8, 12:58pm ET. NEC officially
says that the conductor needs to be upsized but the 2014 will fix it
because that is dumb. I've copied some of Bill's email below.
**
The key distinction was used in my proposal to the 2014 NEC that removed
the statement
Short-circuiting should be OK for crystalline cells, but some thin film
manufacturers ask you not to do this. On the jumper-cutting, I agree
with the others that you probably shouldn't create arcs just for fun!
On 2012/9/17 23:50, Mark Frye wrote:
Wrenches,
True or False: In a nominal sort
I've seen that one a lot, too. And not to quibble, but the 1-line
depicts this correctly (no inline fuse shown in the inverter DC
disconnect box), though there should be a note making this more explicit.
Speaking of sunny days turning off the system, how about the 3 30A
inverter breakers'
:
24 A per inverter x 1.73 = 41.5 A
However, no one reviewing a single-line should have to guess about the service
type
On Aug 30, 2012, at 3:12 PM, Dave Click wrote:
I've seen that one a lot, too. And not to quibble, but the 1-line depicts this
correctly (no inline fuse shown in the inverter
Enphase already positive-grounds the module:
http://enphase.com/support/installation-wiring/
Q: The Enphase Microinverter manual states that the device is positively
grounded. Don't most PV modules have negative grounds? Is this a problem
for Enphase?
A: Enphase made the decision to positively
http://solarabcs.org/about/publications/reports/module-grounding/index.html
(see the Issues Recommendations report)
Phil is right that UL 2703 isn't finalized yet so it's not actually a
requirement. However, I imagine that module installation manuals and UL
1703 will both refer to 2703 soon,
Garrison,
If you're doing a small commercial grid-tie system, your inverter GEC
requirements are determined not by the service size but by your
inverter. To illustrate, if you were installing a single Enphase,
running an unspliced #3/0 copper wire from your pipe up to your inverter
would be
As a note for tile roofs: the tile keeps most of the water on top of it
but it's not the actual sealed layer. The underlayment is the true
waterproofing layer, so be sure you seal the penetration through the
underlayment as well as the hole you cut in the tile.
On 2012/7/18 23:42, Parrish,
I always thought that installing lag screws was tough enough with pilot
holes- I should hit the gym. I'm not a structural PE, but I think that
not drilling pilot holes violates the American Wood Council's National
Design Specs and therefore violates the IBC too. I would imagine that
you'd be
We did a paper on this back in 2000 that folks may find interesting. A
bit outdated- two 10W (thin film) fans were used for a 1000 sf home.
http://www.fsec.ucf.edu/en/publications/html/FSEC-GP-171-00/index.htm
Conclusion:
Comparing periods with similar weather conditions, the test revealed
Here's the Paul Mync / John Berdner article from SolarPro 2.5:
http://solarprofessional.com/article/?file=SP2_5_pg60_Mync
-David Brearley... er... Click
On 2012/5/22 22:36, Bob Clark wrote:
Wrenches:
Sorry to bring up this situation again, but I could not find a previous
discussion thread
Square D probably has a similar solar-ready panel; I remember seeing
some monster (4' tall? they were big) Cutler Hammer panelboards at SPI
2010 that had it too. On my house I have a Square D RC2M200S which has
simply a 200A main plus a 2P 50A breaker (perfect for PV). This is a
much smaller
This is fine; your PVI2500 is rated for 10.4A, while the SB3000 is
12.5A. You can put up to 24A rated current through your 30A fuses.
Though the disconnect isn't technically a service disconnect, I'd
recommend using a 60A rated (fused at 30A) disconnect per 230.79(D). You
would run a neutral
You can calculate this yourself pretty easily for the many modules that
don't explicitly state their efficiency (or for those that just state
the cell efficiency). Get the total *metric* length and width of the
module from the cut sheet. Multiply to get your area in square meters.
235W /
Nick, I don't see that name (or an alternate term) in the report on
proposals (do a search for 120% or 4-375a).
http://www.nfpa.org/Assets/files/AboutTheCodes/70/70_A2013_NEC-P04_ROPballot.pdf
On 2012/3/9 16:45, Nick Vida wrote:
Hello,
I was wondering if any of you wise wrenches know if
Allen, UL 1703 simulates a 1 hailstone @ 50mph by dropping a 1.18lb 2
diameter steel ball 51 onto the glass at any point considered most
vulnerable. IEC 61215 actually uses a 1 ice ball (what a weird thing
to use when simulating hail, right?) and shoots it at 11 points on the
module at 50mph.
As Abraham Lincoln famously said, I'll give it my best shot, but I'm no
Bill Brooks.
A DC ground fault is not impossible on an AC module but it's not the
issue that it is on large DC systems where numerous high-voltage
parallel strings can feed an array fault. When the unit is listed it's
If you're running them on a rooftop (i.e. not buried),
expansion/contraction is a bigger issue with aluminum than copper-- so
plan for that as best you can, like with loops in pull boxes and sweeps
rather than LBs.
On 2012/2/13 13:39, Exeltech wrote:
AL advantage:
Weight (especially in long
The credit still applies. Some things to note are that the placed in
service date is when your customer actually moved in. So if he waited
until the new year to move for property tax reasons (?) he can't claim
the 30% credit until the 2012 tax year. Also, the credit only applies to
new
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