This is very common in and around the NYC area. You'll need a 240V to 208V
transformer. It'll be faster and nowhere near as expensive as paying ConEd
to drop a new bucket transformer for you.
On future projects, be sure to look at the electrical service
Steve
>
>
> Hi Jay,
A 75kVA low voltage transformer will have roughly 0.3% iron core losses and
have an efficiency loss of roughly 2%. It depends on when the transformer
was made and what efficiency standard it was adhered to. the manufacturer
should be able to provide you with the testing results if
William,
I've used a lot of services from Fat Spaniel, SolarMagic, Draker, Noveda,
AlsoEnergy, Locus, Qantum, Powerfactors, and Green Power Monitoring. Which
one is the best is highly dependent upon your preferences and what services
you require. I prefer AlsoEnergy for numerous reasons, one bein
that. It is,
however, less than the traditional BSTC nameplate x 1.25 method.
Regards
Steven Lawrence, PE
___
List sponsored by Redwood Alliance
List Address: RE-wrenches@lists.re-wrenches.org
Change listserver email address & settings:
h
Hi Adam,
I have a 3.3MW site using Hanwha 400s where IV curve tracing and other
voltage checks found roughly 1% of the modules are experiencing some type
of voltage issues. We all suspect bad diodes. We just got the site up and
running and we will be doing an aerial thermal imaging flyover to de
I design a lot of grid tied projects, but I still do a rooftop about once
or twice a year. All of them going back 7 years or so always used
covered/vented cable tray. This includes homeruns, DC feeders, and all AC
wiring. There still is some metallic conduit used (usually EMT) - a small
jumper f
own on the number of melted
connectors. We've averaged maybe 1 or 2 on 6MW projects over a year with
this hard requirement versus 100+ we had on a 1MW rooftop project that
mixed multiple manufacturers.
Steven Lawrence
___
List sponsored by Redwo
Phoenix contact makes a bunch of wireless radios and relays that can
communicate discrete signals as well as standard communications. I've used
it for a minimum export relay with SCE and telemetry for SCE. It's simple
to install and use. If you're going wireless, make sure you have line of
sight
Hi James,
Is the solectria combiner actually combining strings so you have one input
into the SMA inverter? If so, did SMA approve arc fault detection at that
high current? From what I understand, arc fault detection doesn't work on
strings greater than 20A.
In the solectria box, I'm assuming t
to buy a GigaWatt (yes, 1000MW) of modules to store to ride out the
tariff.
I imagine utility scale projects will be hit the hardest. When you have a
$0.10/W tariff being added to a $1.00/W project, that's a 10% increase,
which means a lot of proj
Hi Ray,
Have you checked the torquing on all the other bolts? My company's had a
few projects where some modules blew off - it's always been due to
over-torquing of the bolts.
Steven Lawrence
___
List sponsored by Redwood Alliance
List A
Just to expand on this, the NRTL has to test to the specific UL standard.
However, if you look at the definition of "listed" in the NEC, it states
"equipment, materials, or services included in a list published by an
organization that is acceptable to the AHJ...). I have heard of some
jurisdiction
Kirk,
Double check those connectors very closely. On our other projects,
Canadian solar doesn't use MC4 connectors - they use PV2 which we found
does not mate well with MC4.
Steven Lawrence
___
List sponsored by Redwood Alliance
List Addres
We can get these modules straight from LG, so they are available in the
US. Did you try LG to get a list of distributors they send to?
___
List sponsored by Redwood Alliance
List Address: RE-wrenches@lists.re-wrenches.org
Change listserver email addres
I've had no issues traveling with a DMM and its associated probes.
However, I did travel one time with the Seaward analyzer and that set off
the bomb detection machine. Not a very fun 30 minutes.
___
List sponsored by Redwood Alliance
List Address: RE-w
Hi Dan,
I don't know which state you're in, but the state of NJ put out a notice
stating that solar panels do not require servicing. This came from the top
electrical inspector back in 2010. The link can be found at
http://www.state.nj.us/dca/divisions/codes/publications/pdf_ccc/ccc_spring2010.
Hi Bill,
For a Solaron, I've used a plastic stair tread, some velcro and some super
glue to cover the display. Only a few bucks from Home Depot. It's worked
out pretty well provided it's not very windy.
Steven Lawrence
> Date: Thu, 2 Oct 2014 07:45:01 -0700
> From:
As someone who designs very large systems, I agree with Isaac. There's no
one rule for inverter sizing as there are a multitude of factors in play.
Solarpro's article "Levelized Cost of Energy" in the April/May 2012 issue
goes into inverter ratios and how it ties into LCOE.
__
conductor. The SMA CP-US inverters are transformless
and can use a solidly grounded conductor.
-Steven Lawrence
>
>
> Hello Wrenches,
>
> Attached is an article from Home Power that came in my email. It says
> module degradation is increased by PID (Potential Induced
Hi Max,
Try http://epsii.com/users/awp.php?ln=121219
I just used them for some relay testing and they were outstanding.
Thanks
Steven Lawrence
___
List sponsored by Home Power magazine
List Address: RE-wrenches@lists.re-wrenches.org
Change email
g
BTW) with the full mask on, especially when it's hot outside, but it is
something everyone should be doing when troubleshooting anything energized.
Stay safe.
Steven Lawrence
___
List sponsored by Home Power magazine
List Address: RE-wrenche
Hi Marco,
It goes back to 690.35(D). Transformerless inverters are usually
ungrounded PV systems, so the wire must bein raceways, or it must be PV
wire.
There are a few exceptions, the SMA CP-US inverters can have a grounded
conductor, but you must have a floating AC neutral.
And the Solarons g
Esteemed wrenches,
Does anyone know of an IV Curve Tracer that's rated for 1000VDC and 30A? I
can find some 1000V tracers but they're only at 10A.
Thanks
___
List sponsored by Home Power magazine
List Address: RE-wrenches@lists.re-wrenches.org
Change
Dana,
Maybe wire 3 in series to a single Enphase? It'll depend on what the
voltages are.
> Date: Tue, 4 Jun 2013 14:01:42 -0600
> From: "Dana"
> To: "'RE-wrenches'"
> Subject: [RE-wrenches] Old Modules for GIT system?
> Message-ID: <05f401ce615e$55773960$0065ac20$@com>
> Content-Type: text/p
Luke,
Most tankless hot water heaters can't accept pre-heated water. Some of
them can, but even still these have a minimum heat input into the water.
You may run into a situation where you have 105F water into the tankless
and the thing won't fire up due to safety reasons (can't put out 130F or
s
The state of NJ has rules that PV modules do not require regular
maintenance thus the clearance rules and access do not apply. It's
somewhere in the construction code communicator of 2008-2010.
It maybe not exactly what you're looking for, but maybe it'll help.
> Date: Thu, 31 Jan 2013 15:44:
Hi Robert,
Get a mega Ohm meter, isolate the home runs and perform a test. You should
get >550 MOhms. If not, there's something likely wrong with that string
that's causing the intermittent ground fault. Or, have someone stand on
the ground with a hose pointing it at the roof and try to find it
Hi Conrad,
Without any specs on what the redundant relay is trying to accomplish, I'm
guessing you'll need the SEL 547. It's a microprocessor relay that takes
voltage and current and will trip a circuit breaker provided you have a set
of PTs and CTs.
Steven Lawrence
>
> D
Allen,
I use to use them on the old Sanyo modules. As long as the combined short
circuit rating is less than the series fuse rating, you'll be ok. They're
really only good for modules with high voltage/low current.
-Steven
>
> From: Allen Frishman
> To: RE-wrenches
> Subject: [RE-wrenches]
Hi Marco,
Check out Bentek, Shoals, and SolarBOS. If you're doing thin film, I
suggest looking into the in-line fusing from Shoals.
-Steven
Date: Mon, 6 Jun 2011 13:04:35 -1000
> From: "Marco Mangelsdorf"
> To: "'RE-wrenches'"
> Subject: [RE-wrenches] big combiner box
> Message-ID: <01b201cc
power granting an exception in
this case. Sunpower would not provide it until I informed them that the
rebate was assigned to them. So if anyone has a warranty claim on Sunpower,
don't mention it was installed with the WEEBs (which I also agree is a
superior grounding method).
Steven Lawren
It's the same thing here. They aren't taking any large orders from us.
Steven Lawrence
NABCEP Certified Solar PV Installer(tm)
--
Date: Mon, 17 May 2010 18:22:27 -0700
From: i2p
To: "List for complaining about anything RE."
Cc:
g from the grid. The feeders now have
to be sized to handle the existing main service panel and the new backup load
panel. In this scenario, theoretically 160A could be coming in on feeder
cables rated for a 100A service.
Steve
the backup loads aren't over 60A,
and what's left in the main service panel wouldn't be over 60A. But yeah, it
always depends on the AHJ.
Here in NJ I try to stay away from panel upgrades whenever possible. They can
run from $2k-$3k, and that's not an adder I want to put o
230.80
"Where the service disconnecting means consists of more than one switch or
circuit breaker, as permitted by 230.71, the combined ratings of all the
switches or circuit breakers used shall not be less than the rating required by
230.79"
Steve
n the main service panel that
can be fed from the backup load panel.
Steven Lawrence
__
Date: Wed, 31 Mar 2010 08:13:10 -0700 (PDT)
From: Nick Soleil
To: RE-wrenches
Subject: Re: [RE-wrenches] Supply Side Tap Overcurrent Protection
36 matches
Mail list logo
