[RE-wrenches] Friend with system needs help

Thu Nov 19 17:46:54 PST 2015

My hunch is that you have four strings of 11 modules and 1 of the four strings is wired backwards such that the DC+ goes to the negative input of the inverter, and the DC- of the string to the fused DC+ of the inverter.  This would look fine under open circuit conditions, but not perform properly when connected.  But it is impossible to tell from the information given.  Jay’s advice to test with each string individually would be the way to go.

Mike Kocsmiersky

Principal

Phone: 413 883-3144 

Spirit Solar

www.SpiritSolar.net

From: jay [mailto:jay.peltz at gmail.com] 
Sent: Thursday, November 19, 2015 11:31 AM
To: RE-wrenches
Subject: Re: [RE-wrenches] Friend with system needs help

HI Steve,

So they are all low?

Then I suggest an IV curve tracer.

jay

On Nov 19, 2015, at 7:18 AM, Steve Jefferson <Steve.Jefferson at sma-america.com> wrote:

The outputs are pretty close. That’s what is throwing me off.

In most trouble shooting adventures, the problem is fairly obvious.

This one, not so much.

SMA America, LLC

Steve Jefferson

Service Line Supervisor

3925 Atherton Ave

Rocklin, CA 95765 - 3714

U.S.A.

Tel:  +1 916 625 3185 (direct)

Fax: +1 916 625 0871

Mobile: +1 916 622 4253

Email:  <mailto:Steve.jefferson at SMA-America.com> Steve.jefferson at SMA-America.com

 <http://www.sma-america.com/> www.SMA-America.com

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From: RE-wrenches [ <mailto:re-wrenches-bounces at lists.re-wrenches.org> mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Jay
Sent: Wednesday, November 18, 2015 1:42 PM
To: RE-wrenches < <mailto:re-wrenches at lists.re-wrenches.org> re-wrenches at lists.re-wrenches.org>
Subject: Re: [RE-wrenches] Friend with system needs help

Hi steve. 

Is the output from each string of 11 the same?

Have you tried ruining 1 string at a time?  

Jay

Sent from my iPhone

On Nov 18, 2015, at 11:14 AM, Steve Jefferson < <mailto:Steve.Jefferson at sma-america.com> Steve.Jefferson at sma-america.com> wrote:

Afternoon wrenches,

I have a friend who I helped install second hand modules onto a pergola structure at their home.

The system is as follows:

44 – Siemens SP-150

1 – SMA SB6000US-12 (XFMR unit)

Since install, they have not produced half of what they should be.  I have tested the diodes and they seem to be good, there were a couple that tested questionable, so they were replaced.

VOC is good, but it seems that under load the system goes to garbage.

I am at a loss of what/how to test anything else that may determine cause.

Would a PV Analyzer help? Would there happen to be anyone in the Sacramento area with one who could come to the site? Obviously the customer will pay for their time.

Thanks in advanced.

SMA America, LLC

Steve Jefferson

Service Line Supervisor

3925 Atherton Ave

Rocklin, CA 95765 - 3714

U.S.A.

Tel:  +1 916 625 3185 (direct)

Fax: +1 916 625 0871

Mobile: +1 916 622 4253

Email:  <mailto:Steve.jefferson at SMA-America.com> Steve.jefferson at SMA-America.com

 <http://www.sma-america.com/> www.SMA-America.com

 <http://www.youtube.com/watch?v=yQWzPuyqhzo&feature=youtu.be> <image001.png>

This email and any attachments thereto may contain SMA America, LLC confidential, privileged and private material for the sole use of the intended recipient. Any review, copying, or distribution of this email (or any attachments thereto) by others is strictly prohibited. If you are not the intended recipient, please contact the sender immediately and permanently delete the original and any copies of this email and any attachments thereto. Thank you.

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