[RE-wrenches] Kyocera 120's low voltage

[Larry Crutcher, Starlight Solar Power Systems]

David,

Kyocera KC-120-1’s from 1999 to Dec 2002 will fail from a defective solder joint. Although out of warranty, they are still be warranted by Kyocera and replaced with a remanufactured KC-120-1R. Contact them (Rae.Parafiniuk at kyocera.com) with the serial numbers and mfg dates to get an RMA started. 

We keep the remanufactured units in stock at our store because we see so many of these. Kyocera will also pay labor to replace them. 

Thank you,

Larry Crutcher
Starlight Solar Power Systems





On 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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