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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