Wrenches, William
Yes, not as unusual as you might think, BP's did it, Suntec had numerous
issues, even Sharp

On Fri, Jun 26, 2020, 3:27 PM William Miller <will...@millersolar.com>
wrote:

> Friends and colleagues:
>
>
>
> I recently performed a service call at a grid-tied installation we did in
> 2003.  The homeowner noticed the daily consumption had declined to about
> 1/3 of typical sometime in the last year.  Sure enough 2 of the three
> strings (30 mods in total) of Siemens SP150s showed low voltage.
>
>
>
> When I tilted up two of the racks to expose one dead string of 10, I found
> that 6 of the 10 panels had 1/3 or 2/3 of the expected OC voltage.  Testing
> of the individual strings indicated that 1 or 2 strings were dead on each
> affected panel.
>
>
>
> Close examination revealed pinpoint heat damage on inter-cell traces.  The
> diodes tested good.  See photo below.
>
>
>
>
>
> I am surprised to see such a high rate of failure.  Has anyone else
> experienced this with these or other panels?
>
>
>
> Is anyone servicing warranty claims on these ancient panels?  I doubt
> there is much value left in the warranty but I am curious.
>
>
>
> Thanks in advance.
>
>
>
> William Miller
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