[RE-wrenches] Bad Diodes in QCells?

[Brian Mehalic]

Has anyone diagnosed truly failed diodes? Or pinpointed other failures in the junction box or cell groups that could open circuit them? 

I’d really like to see some thermal images!

Brian

> On Nov 9, 2020, at 5:58 PM, Steven Lawrence <lawrencesteven at gmail.com> wrote:
> 
> 
> 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 determine just how extensive the issue is.
> 
> 
>> Date: Thu, 5 Nov 2020 23:26:58 -0500
>> From: AE Solar <autonomousenergies at gmail.com>
>> To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
>> Subject: [RE-wrenches] Bad Diodes in QCells?
>> Message-ID:
>>         <CAHA29TRiFRS6BOzL+cnoB84gMStp_E3fUC+QAFWGxPDA+DkgoA at mail.gmail.com>
>> Content-Type: text/plain; charset="utf-8"
>> 
>> Wrenchers,
>> Wondering if anyone has had any experience with bad diodes in QCell panels.
>> Two of our projects this summer had panels that were putting out half of
>> their rated voltage. At first it seemed like it was a defect from the
>> factory, and it was caught upon commissioning the system, but I'm now
>> seeing that another panel has gone bad about two months after install. I've
>> spoken with a few distributors and they said they haven't heard anything
>> about this being a pattern. I'm in the RMA process with QCell, and don't
>> feel like I'm getting complete transparency from them. So far we have 8
>> defective panels out of 300. It was in two different projects that were
>> months apart. I'm not sure if they were from the same shipment or not. All
>> of them were Q.PEAK DUO 400 watt panels. Interested to know if anyone else
>> is having similar experiences? Thanks for any thoughts.
>> Adam
>> 
>> Adam Katzman
>> Autonomous Energies
>> PO Box 1245
>> Kingston, NY 12402
>> www.autonomousenergies.com
>> (518) 567-1468
>> 
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