[RE-wrenches] Kyocera 120's low voltage

[Jerry Shafer]

David
The KC 120 had some issues with soldered connections on the module looks
like a cigarette burn from the back or maybe just a blister, it will be on
the shrt side of the module. Anyway it will drop the module in half most of
the time or try to work while it burns the poorly soldered connection, it
will also get bery hot as it is arcing inside. You need the SN# and call
the manufacture if its on there list it might be replaceble they can tell
you. As I recall its a C that is the SN that has an issue but check to make
sure.
I have replaced entire arrays because of this.


On Wed, Jun 11, 2014 at 4:47 PM, Dave <dave at independentpowerllc.com> wrote:

> Wrenches,
>
>
>
> I troubleshot an underperforming off grid array today and found low Voc's
> in 4 out of 10 KC-120's (nominal 12v modules rated at 21.5 Voc and 7.45
> Isc).  Modules are vintage 2000.
>
> Under modest sunlight (500 to 600W per M sqd) 6 modules measured from 18
> to 19 Voc and 4 Isc. Four modules measured from 9.6 to 13.7 Voc and 4 Isc.
>
>
>
> I was chased off the roof by a coming thunderstorm and did not check for
> bad diodes. These modules have nice old school J-boxes with 6 diodes per
> each module.
>
>
>
> Am I looking at a diode issue, or failing modules?
>
>
>
> Thanking you in advance for your time,
>
>
>
> David Palumbo
>
> Independent Power LLC
>
> 462 Solar Way Drive
>
> Hyde Park, VT 05655
>
> 802-888-7194
>
>
>
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