[RE-wrenches] PV voltage at Isc
Greg Egan
greg at remotepowerinc.com
Sat Feb 5 11:30:14 PST 2011
Fellow Scientists,
I got in a discussion with a wrench the other day. He is under the
impression that when a PV module is at short circuit current there is no
voltage. My understanding of electricity is that if there's no voltage
there's no current because current needs voltage in order to flow. I'm
seeing it as a difference in potential, voltage that is. If there's no
difference in potential I don't understand why current would flow.
I googled it and the few links I checked out were on his side - zero
voltage at Isc. All this is of course irrelevant to the business of
installing PV so if you don't care I don't blame you.
So I still think that if you a precise enough meter that if you stuck
the test leads into the cables sticking out of the back of a shorted PV
module that you'd read some small voltage that was approaching zero.
Any explanation of why I am right or wrong in plain English (I'm not
really a scientist) would be welcome.
All the best,
Greg Egan
Remote Power Inc.
Fairbanks, AK
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> Today's Topics:
>
> 1. Re: PV Encapsulant Quality (Eric Thomas)
> 2. I Need a Sharp SunVista Manual (Brian Sipp)
> 3. Re: I Need a Sharp SunVista Manual (Jeff Irish)
> 4. Re: I Need a Sharp SunVista Manual (Brian Sipp)
> 5. Re: PV Encapsulant Quality (Jesse Dahl)
> 6. Re: Matching modules into Xantrex GT (Allan Sindelar)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Fri, 4 Feb 2011 10:33:27 -0800
> From: Eric Thomas <solarepiphany at gmail.com>
> To: re-wrenches at lists.re-wrenches.org
> Subject: Re: [RE-wrenches] PV Encapsulant Quality
> Message-ID:
> <AANLkTi=fAxBTRHLxoR9WQaLEJn8e7v_gygpdYepusjb6 at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Here is a great report that goes over advanced life cycle
> testing of modules and their reasons for failure.
> http://www.nrel.gov/docs/fy11osti/47755.pdf . It is a recent study and there
> is some good info regarding encapsulents. I can tell you that the high
> ranker on the results chart is the Silicon Energy Cascade module. With its
> glass on glass encapsulent and integrated wireway, its the most robust
> module I've ever seen. We installed the largest WA residential system
> utilizing these modules in Dec of last year. They are nice to work
> with...not without their challenges of course, but as far as warranty..I
> think they will last the test of time.
>
> Eric Thomas
> Solar Epiphany
> (206)919-3014
> www.solarepiphany.com
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> ------------------------------
>
> Message: 2
> Date: Fri, 4 Feb 2011 13:21:09 -0800
> From: "Brian Sipp" <Brian.Sipp at FirstSourceSolar.com>
> To: "'RE-wrenches'" <re-wrenches at lists.re-wrenches.org>
> Subject: [RE-wrenches] I Need a Sharp SunVista Manual
> Message-ID: <8B7DB7ABA13B4A05A1E69FCEA166F07B at FirstSource>
> Content-Type: text/plain; charset="us-ascii"
>
> I just got off the phone with the worlds worst customer (dis)service rep. at
> Sharp. It really calls into question whether I want to sell any more of
> Sharp modules, if this is how they treat their past customers.
>
> Does anyone have a PDF of the Sharp SunVista manual? The only thing I find
> online, or Sharp would provide, is a 2 page cut sheet.
>
>
> Brian M. Sipp
> First Source Solar Systems
> <http://www.firstsourcesolar.com/> www.FirstSourceSolar.com
>
>
>
>
>
>
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> ------------------------------
>
> Message: 3
> Date: Fri, 4 Feb 2011 16:31:41 -0500
> From: "Jeff Irish" <jeff at hvce.com>
> To: "RE-wrenches" <re-wrenches at lists.re-wrenches.org>
> Subject: Re: [RE-wrenches] I Need a Sharp SunVista Manual
> Message-ID:
> <86FA2C8AA80F3C49AE21B7EC7BD559B8798995 at HVCE-SERVER.hvcegroup.local>
> Content-Type: text/plain; charset="us-ascii"
>
> Brian,
>
>
>
> I have one but it's a big file and I don't want to overload everyone's
> mailboxes. Email me off-line at jeff at hvce.com
>
>
>
> Jeff Irish
>
> Hudson Valley Clean Energy
>
> and Adirondack Solar
>
>
>
> ________________________________
>
> From: re-wrenches-bounces at lists.re-wrenches.org
> [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Brian
> Sipp
> Sent: Friday, February 04, 2011 4:21 PM
> To: 'RE-wrenches'
> Subject: [RE-wrenches] I Need a Sharp SunVista Manual
>
>
>
> I just got off the phone with the worlds worst customer (dis)service
> rep. at Sharp. It really calls into question whether I want to sell any
> more of Sharp modules, if this is how they treat their past customers.
>
>
>
> Does anyone have a PDF of the Sharp SunVista manual? The only thing I
> find online, or Sharp would provide, is a 2 page cut sheet.
>
>
>
>
>
> Brian M. Sipp
> First Source Solar Systems
> www.FirstSourceSolar.com <http://www.firstsourcesolar.com/>
>
>
>
>
>
>
>
>
>
>
>
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> ------------------------------
>
> Message: 4
> Date: Fri, 4 Feb 2011 14:05:03 -0800
> From: "Brian Sipp" <Brian.Sipp at FirstSourceSolar.com>
> To: "'RE-wrenches'" <re-wrenches at lists.re-wrenches.org>
> Subject: Re: [RE-wrenches] I Need a Sharp SunVista Manual
> Message-ID: <F23DB5CB2F37496092CD7CCC9A263EC8 at FirstSource>
> Content-Type: text/plain; charset="us-ascii"
>
> Wow, that was fast! Thank you to everyone who replied on and off line. As
> always the wealth of knowledge on the forum, and folks openness to share
> always impresses me!
>
> This made my day!
>
> PS: Sharp - Start taking notes...
>
>
> Brian M. Sipp
> First Source Solar Systems
> <http://www.firstsourcesolar.com/> www.FirstSourceSolar.com
> Office: 530-554-1925
> Mobile: 916-342-2630
>
>
>
> _____
>
> From: re-wrenches-bounces at lists.re-wrenches.org
> [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Jeff Irish
> Sent: Friday, February 04, 2011 1:32 PM
> To: RE-wrenches
> Subject: Re: [RE-wrenches] I Need a Sharp SunVista Manual
>
>
>
> Brian,
>
>
>
> I have one but it's a big file and I don't want to overload everyone's
> mailboxes. Email me off-line at jeff at hvce.com
>
>
>
> Jeff Irish
>
> Hudson Valley Clean Energy
>
> and Adirondack Solar
>
>
>
> _____
>
> From: re-wrenches-bounces at lists.re-wrenches.org
> [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Brian Sipp
> Sent: Friday, February 04, 2011 4:21 PM
> To: 'RE-wrenches'
> Subject: [RE-wrenches] I Need a Sharp SunVista Manual
>
>
>
> I just got off the phone with the worlds worst customer (dis)service rep. at
> Sharp. It really calls into question whether I want to sell any more of
> Sharp modules, if this is how they treat their past customers.
>
>
>
> Does anyone have a PDF of the Sharp SunVista manual? The only thing I find
> online, or Sharp would provide, is a 2 page cut sheet.
>
>
>
>
>
>
> Brian M. Sipp
> First Source Solar Systems
> www.FirstSourceSolar.com <http://www.firstsourcesolar.com/>
>
>
>
>
>
>
>
>
>
>
>
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> ------------------------------
>
> Message: 5
> Date: Fri, 4 Feb 2011 16:05:45 -0600
> From: Jesse Dahl <dahlsolar at gmail.com>
> To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
> Subject: Re: [RE-wrenches] PV Encapsulant Quality
> Message-ID: <69420D91-5072-41E1-AF12-4A9FE7D1B492 at gmail.com>
> Content-Type: text/plain; charset="us-ascii"
>
> Wrenches,
>
> I live in northern MN where Silicon Energy is building a new manufacturing plant. I also teach at the local community college. I have met with silicon energy and have seen the tests. Great module. Looks nice installed too. Mounting options are limited but the glass on glass is a really good idea.
>
>
> Jesse
>
> Sent from my iPhone
>
> On Feb 4, 2011, at 12:33 PM, Eric Thomas <solarepiphany at gmail.com> wrote:
>
>
>> Here is a great report that goes over advanced life cycle
>> testing of modules and their reasons for failure.
>> http://www.nrel.gov/docs/fy11osti/47755.pdf . It is a recent study and there is some good info regarding encapsulents. I can tell you that the high ranker on the results chart is the Silicon Energy Cascade module. With its glass on glass encapsulent and integrated wireway, its the most robust module I've ever seen. We installed the largest WA residential system utilizing these modules in Dec of last year. They are nice to work with...not without their challenges of course, but as far as warranty..I think they will last the test of time.
>>
>> Eric Thomas
>> Solar Epiphany
>> (206)919-3014
>> www.solarepiphany.com
>>
>> _______________________________________________
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> ------------------------------
>
> Message: 6
> Date: Fri, 04 Feb 2011 23:22:56 -0700
> From: Allan Sindelar <allan at positiveenergysolar.com>
> To: Kent Osterberg <kent at coveoregon.com>
> Cc: RE-wrenches <re-wrenches at lists.re-wrenches.org>
> Subject: Re: [RE-wrenches] Matching modules into Xantrex GT
> Message-ID: <4D4CECC0.8000901 at positiveenergysolar.com>
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