It seems to me that allowing an expensive array to be quickly and easily
removed from a roof is a Very Bad Thing- I'd guess that the customer's
insurance company would have an issue with this too. Will they also
require that heat pumps have wheels and flexible pipes, so that they can
be moved b
2% loss is significant, but I think that Darryl was saying that the
resistance for stranded wire was 2% higher than solid. So if you had a
3% voltage drop in your system with stranded wire, you could rewire the
system with solid wire and have a voltage drop of (3% x 0.98) 2.94% at
peak producti
the building had
broken off 3 strands from a #2/0 cable to fit it in the main lugs. Yikes!
DKC
Original Message
Subject: [RE-wrenches] PV System Design Compromises (was solid vs
stranded AC vs DC)
From: Joel Davidson
To: RE-wrenches
Date: 2009/8/5 14:30
Dave, I agree. but are
You are receiving Wrench list digests. If you are responding to one of the
messages in the digest, be sure to replace the subject line with the correct
one for the individual message. Thanks.
Here's a cable that may use B.310.1, which is probably overkill for most
of our work:
http://www.amerc
The only system I've done with this feature, we used 2 Seas (now Iron
Ridge, it appears) racking. I guess if you can limit those racks to
being only two modules high, the weight would still be manageable. Still
not something that one person can easily adjust, though.
Example:
http://www.ironri
All,
Couldn't find this anywhere in the archives; sorry if it's a repeat. I
just went out to inspect a ground-mount system that had 3 source
circuits feeding a metal DC combiner/disconnect. Wiring was free air
until it got near the disconnect, then the positive wires entered an
open 3' sectio
eilwitz, Whidbey Sun & Wind
To: RE Wrenches listserve
Date: 2009/8/19 21:10
Dave,
Only GEC's are subject to the "continuous" rule (250.64C). It sounds like
your are talking about an EGC tapped from the GEC.
When splicing PV GEC's required under 690.47D, either together (f
ird-Sun.com
Clean Energy - Expertly Installed
- "Dave Click" wrote:
> Thanks all.
>
> It was my understanding that we should still be running the
conductors
> of the same circuit through the same raceway, even if it is the
DC input
> into the
ods. Also, Hydro Quebec buys off
peak power from the U.S. grid when it’s dirt cheap to power Montreal
overnight. This saves some of their own water power for selling to the
States during peak periods. A nice money making deal for Quebec. So,
your idea is worth thinking about for regions such as H
I've heard of them and they are new. I don't think they're making them
in Florida yet but they claim to be US-made. I think that on the
previous edition of their website they were planning an 800W crystalline
module(!), now they seem to have scaled back to "only" a 600W sometime
next year.
Th
Carl, it looks like you're already Code-noncompliant thanks to the 100A
garage panel having 100A utility, 20A PV, and 20A wind breakers
supplying it. Adding an additional 20A of PV of course doesn't help
things. I'd replace the 100A panel with a 150A+ (so probably a 200A),
keeping the 100A main
ust use an unfused safety switch on the PV output.
Thanks,
Dave
___
List sponsored by Home Power magazine
List Address: RE-wrenches@lists.re-wrenches.org
Options & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
The original code citation here was directed toward large rooftop unit
(RTU) air conditioners and other large equipment that can not be
disconnected without extensive cost and disruption to the building
occupants during re-roofing. Hopefully this helps someone in case they
have this imposed as
This may help, from a SEIA webinar in September. To answer your
question: "It depends." (sorry!) See pages 13-15.
http://www.seia.org/galleries/pdf/SEIA%20Tax%20Basis%20Webinar%209%2024%2009%20%5BCompatibility%20Mode%5D.pdf
Original Message
Subject: Re: [RE-wrenches] 2009 Fede
http://www.rules.house.gov/111/AmndmentsSubmitted/hr2454/cardoza173_hr2454_111.pdf
Back in June, I found this amendment to the Waxman-Markey Cap and Trade
bill- limiting solar permit costs for residential at $500 and
noncommercial at 1% of the project cost, up to $10k. Noncompliance with
permi
Peter,
(1) it appears that per the WEEB installation manual:
http://www.we-llc.com/Datasheets/104-0404-08-008.pdf
(page 8) you need to have one WEEB per module rather than one for every
other module as you suggest.
(2) 690.43 Equipment Grounding.
Exposed non–current-carrying metal parts of
B clips bonding modules C and D to
rails #1 and #2, etc. - Peter
-Original Message-
From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Dave Click
Sent: Tuesday, November 17, 2009 12:14 PM
To: RE-wrenches
Subject: Re: [RE-wrenches]
Just a note here- rather than using the record lows, you can go back to
the future and use the ASHRAE minimum expected temperatures as the 2011
NEC will allow explicitly. In the '08, it says to use the "lowest
expected ambient temperature," for which the ASHRAE temperatures are
more appropriate
:re-wrenches-boun...@lists.re-wrenches.org>] On Behalf Of
Dave Click
Sent: Tuesday, November 17, 2009 1:09 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] Bonding Rails
Yes, that's correct. In my answer I was just rephrasing it to say you'd
need twice as many WEEBs a
2500U Inverter
From: robert ellison
To: RE-wrenches
Date: 2009/11/18 11:01
My eyes must be bad, i just looked at the entire list 3 times and New
York state is not on it anywhere.
I have see 48 below and just wanted to see what the averages ctually were.
Bob
On Wed, Nov 18, 2009 at 7:30 AM,
Message
Subject: Re: [RE-wrenches] SWR2500U Inverter
From: Kirpal Khalsa
To: RE-wrenches
Date: 2009/11/18 11:33
Solar Friends..as you have referenced Dave the code does allow
for using the softer records relating to low temps..However.as
in the example presented in the S
Wrenches-
How are folks wiring the Soladeck boxes? It seems that the intent is to
use cord grips in the south end of the box, but I just saw another
installation where the wires just came directly in through the space at
the south end. Seems like the foam is included to keep bugs out rather
t
ince they're designed for combiner boxes.
http://www.heyco.com/products/sec_02/pdf/2-32.pdf
Thanks all!
Original Message
Subject: Re: [RE-wrenches] wiring the Soladeck
From: Scott Knapp
To: re-wrenches@lists.re-wrenches.org
Date: 2009/11/24 22:16
Dave,
As you've seen o
> Speaking of IBEW, how
> about the installation done in Dorchester, Ma., do you mount your arrays
> vertically?
That (relatively small--5.4kW) array was installed vertically to improve
its visibility from I-93. It was understood that vertical PV facing
somewhat SE wouldn't have been as efficie
t was: NABCEP - grid tie---Off grid
From: Bill Loesch
To: RE-wrenches
Date: 2009/11/30 09:09
Hi Dave,
Isn't using the building face or other appendage, rather than or in addition
to the roof what one definition of BIPV is ?
Regarding the non optimum azimuth orientation -
Unfortunate t
I believe that in a Code Corner back in the '05 era, John Wiles had said
that MC cable was OK to use, then in a later Code Corner he says that it
isn't; I thought it was because part of the reason for a metal raceway
is physical protection, and EMT/FMC would be sturdier than MC. But then
I look
Something that may help with the inspector would be to alternate
trusses. If your array spanned ten trusses, which I'll call A-J, and you
have three rows of six rails:
Rail #1, 3, 5: attach to A, C, E, G, I, J
Rail #2, 4, 6: attach to A, B, D, F, H, J
It's not helping his concern on the end tr
In Photon's side-by-side module test a few years ago, I remember that
one of the worst-performing modules (in kWh/kW) had marketing materials
that targeted the off-grid market. The author suggested that by
targeting off-grid, they were able to obscure their low production-
perhaps another reaso
0.9 x latitude seems to be a good rule of thumb for direct grid-tie systems.
Original Message
Subject: Re: Malabar Cove Solar Array
From: ScottT
To: Dave Click
Date: 2010/1/2 12:39
Hello Wrenches,
My Solar Pathfinder Assistant (SPA) claims that the optimum tilt angle
for
There's no problem with installing the panel and 690.64(B) is the
appropriate section to look at.
"690.64(B)(2) Bus or Conductor Rating. The sum of the ampere ratings of
overcurrent devices in circuits supplying power to a busbar or conductor
shall not exceed 120 percent of the rating of the b
Sometimes utilities will set a max too- here in Florida the
investor-owned utilities have a rule that you take (d...@stc) x 0.85 to
get the "AC equivalent" size of the array. That size then can't exceed
90% of the service rating. Not sure if this is an issue in other states.
Scott McCalmont wr
Late reply, but if anyone ever needs the code reference for William's
method:
404.6 Position and Connection of Switches.
(C) Connection of Switches. Single-throw knife switches and switches
with butt contacts shall be connected such that their blades are
de-energized when the switch is in the o
Is the answer here (at least the one that NABCEP intends) just that the
VMP of a "12V module" is higher than the voltage of a 12V battery? With
the higher voltage it will charge the battery with its corresponding
current based on the I-V curve. The objective reads "Explain why PV
modules make e
Wrenches,
I am tasked with reviewing an installation by a licensed electrician in
Vermont and would like help with the following:
Grid-tied PV system with battery back-up. AC point of connection is a supply
side tap (done on customer side of utility meter ) then traveling 5 feet of
#2 THHWN
and cause a meter fault.
But at least when the meter fails you have your important stuff on
battery-backup...
Dave Palumbo wrote:
Wrenches,
I am tasked with reviewing an installation by a licensed electrician in
Vermont and would like help with the following:
Grid-tied PV system with batte
se this disconnect safely?
Dave
David Palumbo, NABCEP Certified PV Installer
Independent Power LLC
Offices in Lamoille and the Champlain Valley
802.888.7194
www.independentpowerllc.com
___
List sponsored by Home Power magazine
List Addr
outer poles in series to use the 361RB
disconnect per its UL listing. Per Schneider Electric's "Self-Certified"
method you'd be fine breaking it just once (the 30A disconnect can take
a 12.8A Isc).
Original Message
Subject: Re: [RE-wrenches] Ground
One could interpret that if you have 6 or more inverter breakers getting
combined in a panel, you'd want one main breaker so that you wouldn't
have to turn off all ten individually to disconnect the system.
Something else to ask the AHJ.
Peter Parrish wrote:
When we use a sub-panel to combine
ns for wrenches:
1) Is that whole thing a viable idea?
2) 100 Amp automatic transfer switch recommendations?
3) LED signal light recommendations? Or is there another method to
warn homeowner of grid down status?
Thanks,
Dave
David Palumbo, NABCEP Certified PV Install
ile and
have no idea when their final product will be available.
Thanks,
Dave
David Palumbo, NABCEP Certified PV Installer
Independent Power LLC
Offices in Lamoille and the Champlain Valley
802.888.7194
www.independentpowerllc.com
___
Li
Jeff- The Sunny Boys can be reprogrammed into "off grid" mode so they
can work between 56-64 Hz, but I believe you need both a service cable
and a call to SMA tech support to make that happen. They then note in
their system that that inverter's been adjusted to no longer meet UL 1741.
Jeff Yag
It seems to be -0.5%/degC:
http://rredc.nrel.gov/solar/calculators/PVWATTS/moreabout.html
Original Message
Subject: [RE-wrenches] PVWatts Module Temperature Coefficient (was
Enphase derate)
From: Joel Davidson
To: RE-wrenches
Date: 2010/4/18 12:23
Wrenches,
PVWatts does
a 48 volt battery bank for this home, so we could do the Lorentz
pump. This pump is designed to be powered with 48VDC nominal correct?
Is it a reliable pump?
Or will it be more trouble than the AC Grundfos?
Thanks,
Dave
David Palumbo, NABCEP Certified PV Installer
Independent Powe
Jim,
You have probably seen this already but it’s worth a mention here. Good article
in SolarPro magazine April/May “Optimal PV-to-Inverter Sizing Ratio”.
Dave
From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Jim
Something you can do is guarantee a kWh amount given a certain amount of
irradiance. Offer X annual kWh given 2000 sun-hours, perhaps. If you're
in a snowy area, just make sure the irradiance meter keeps snow on it as
long as the modules would.
Of course you wouldn't just take 0.8 into PVWatts
Good call Ray to incorporate out-of-spec grid in areas where that's an
issue (and probably a good idea to include just in case!).
If you need justification on future projects as to why you can't just
guarantee a flat #:
http://rredc.nrel.gov/solar/calculators/PVWATTS/version1/interp.html
"For
I've got my SMA SB5 on a revenue grade meter and it's actually
under-reported slightly since I started comparing it last August. SMA's
counter has increased by 5649 kWh while the revenue meter has increased
5666 kWh- only 0.3% off. If I remember correctly from their training
session they said t
Quick poll- how many inspectors/utilities out there require the "live on
both sides" label for AC Disconnects, even after you explain to them
this only applies to DC disconnects? Even though it's inaccurate, I feel
that it at least gives unqualified personnel pause before they open up a
switch
bove and are rated at 35 more Watts. Sanyo's cost me a $1.00 per
Watt more. Sanyo's have a 20 year warranty which is behind the times for a
top quality module.
Dave
From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Joel
David
I hope for your sake that you're kidding, because your residential
customers may eventually find out that the power-save devices don't
deliver the promised savings and will ask you why it was a $400 option.
I'm guessing that the Oceanlink "Energy Solution" is even less effective
than the power
Jason, I don't believe that you're working with correct information and
I'm not sure who you spoke with here at FSEC. Please contact me offlist
so we can discuss this further.
Also, we'd be pretty excited to learn that you were installing 200
systems in the state. Carry on!
Original
For comp shingle jobs there is now a good economical choice. Actually two
choices from one manufacturer EcoFasten www.ecofastensolar.com They make
Quickfoot and also GreenFasten. Good quality products, good price points.
They are also sold under other names by distributors such as DPW which calls
good said concerning Interstate deep cycle
batteries.
Dave
From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of bob
Sent: Tuesday, June 29, 2010 6:53 AM
To: 'RE-wrenches'
Subject: [RE-wrenches] Interstate UL-16 HC problem
ng rack to fasten plastic lattice
(white in color, available from Lowe's) cut to sizes needed. Inspectors I
have showed this to here in Vermont like it.
Dave
From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Andy Tyson
Sent: T
Tom,
I have seen many Surrette battery banks of two series strings in parallel
last 10 to 12 years. Also have had a few with three string banks go that
long. All were well designed systems with homeowners providing good
maintenance.
Dave
From: re-wrenches-boun...@lists.re-wrenches.org
THWN-2 smaller than #8 is hard to find but I hear
http://www.encorewire.com/site_flash/index.html makes it and that
Graybar sells it. When I asked Southwire about it about two years ago, I
got a collective "huh?"
Original Message
Subject: Re: [RE-wrenches] #10 THWN-2
From: Da
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
propert
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 with
in advance and hope everyone has a nice weekend!
Dave
___
List sponsored by Home Power magazine
List Address: RE-wrenches@lists.re-wrenches.org
Change email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
thanks for the feedback, everybody!
On 2013/8/30 21:42, Jesse Dahl wrote:
I have two installed so far, 0 issues. One is 5 feet from the inverter one is
around 50 feet away. Lots to like!
Jesse
Sent from my iPhone
On Aug 30, 2013, at 6:41 PM, SwingJunkie wrote:
Dave,
We put one in early
lding up for off grid use
over the past few years.
This for northern Vermont where even with C/8 PV to battery charge rate we
need to run the generator about 250 hours per year as the cloud cover is
dense for weeks at a time.
Thanks,
Dave Pa
Ecogen it is. Thanks everybody.
Dave Plaumbo
From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of John
Blittersdorf
Sent: Sunday, September 15, 2013 7:11 AM
To: RE-wrenches
Subject: Re: [RE-wrenches] Off Grid LP Gen advice
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 no
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 del
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
I purchased through Norwall PowerSystems www.Norwall.com I did not price it
at Lowes so I don't know if I paid more or less but it was the lowest price
I could find. Easy to deal with so far. Received EcoGen yesterday.
Dave Palumbo
Independent Power LLC
From: re-wrenches
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
array. I
have used Iota chargers in the past, but wondered if they are other options
worth considering.
Thanks,
Dave
David Palumbo
Independent Power LLC
462 Solar Way Drive
Hyde Park, VT 05655
www.independentpowerllc.com
Vermont Solar Partner
25 Years Experience, (802) 888
** *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 c
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
___
L
Tekris Power Electronics in NJ. Chris Hanrahan has been repairing these for
many years and is top notch. 732-938-4996
David Palumbo
Independent Power LLC
462 Solar Way Drive
Hyde Park, VT 05655
NABCEPTM Inaugural Certificant
(802) 888-7194
From: re-wrenches-boun...@lists.re-wre
rent grounding
electrode systems that you don't want to miss,
Dave
PS If this post violates list etiquette, my apologies in advance,
Michael. We don't get a commission, if that helps...
___
List sponsored by Home Power magazine
List Addre
also 3rd inverter.
Dave
David Palumbo
Independent Power LLC
462 Solar Way Drive
Hyde Park, VT 05655
NABCEPTM Inaugural Certificant
(802) 888-7194
From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of William
Miller
Allan,
The Full River sealed battery line also has charging voltages similar to the
numbers for the Rhinos. We have had good results with many Full River
battery banks, no premature failures to date. Certainly these are higher
charging voltages than the early VRLA batteries we saw years ago.
William-
Yes, you can use the 90C column for ampacity adjustment when using 90C
wire, per the awkward 110.14(C)- "Conductors with temperature ratings
higher than specified for terminations shall be permitted to be used for
ampacity adjustment, correction, or both."
Assuming copper wiring and
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 load-s
arious environments where
our conductors are going is an incredibly interesting process.
310.15(B)(DKC)
On 2014/1/24, 14:42, William Miller wrote:
Dave:
Thanks for this post, although in order to completely understand, it I
sacrificed a significant amount of time working up a spreadsheet and runni
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.
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 equipment
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
tions
exist beyond USE-2?
Thanks!
Dave
___
List sponsored by Home Power magazine
List Address: RE-wrenches@lists.re-wrenches.org
Change email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
List-Archive: http:/
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 distrib
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:
http://www.nmsu.edu/~tdi/Photovoltaics/Codes-Stds/
rrent
Karl,
Can you give us some more details on their concerns? I've done some
very large single phase ag installs and the only time I've had issues
is when we exceed the 80% of minimum load on the medium voltage feeder.
Best,
-N
On Thu, Mar 27, 2014 at 2:51 PM, Karl Jaeger
mailto:
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 s
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 subje
Wrenches,
I have a customer with one SW 230 poly V2.0 frame (top mount) module that
has shattered glass. It is on a DPW TPM10 pole mount. She noticed it the
other day and does not think that it was hit by anything. I agree that is
unlikely based on the site conditions.
Other than by a falli
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 cen
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, Ra
looking to overrule another PE if it is in fact
an engineered system and it's just that the wrong set of plans got
submitted to the building department.
DKC
On 2014/6/3, 10:12, Jason Szumlanski wrote:
Dave,
I can't identify your hardware, but I just wanted to comment on your
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" d
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
0.3(B)] and it's unlikely that you could put multiple units on a
single breaker anyway because when you take (2 inverters) x (rated
current) x (1.25) you will probably come up with a minimum breaker size
that is larger than the maximum allowed under the NRTL listing to UL 1741.
Dave
On 201
chard L Ratico wrote:
I may be playing devil's advocate here, but I want to add a few thoughts. Jay, I
just looked at Fronius and SMA inverter data sheets. I found no spec. for an
output OCPD, only a spec for max. output current.
William, most inverters now come with integrated DC/AC dis
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
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
others
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 7
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
, posing an
electric shock, electrocution or fire hazard.
http://www.cpsc.gov/en/Recalls/2014/SolarWorld-Recalls-Solar-Systems-with-Copper-Grounding-Lugs/
Dave
___
List sponsored by Redwood Alliance
List Address: RE-wrenches@lists.re-wrenches.org
Change
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 comm
201 - 300 of 1400 matches
Mail list logo
