[RE-wrenches] GE GEPVp-055 Modules

[Peter Parrish]

I have been servicing this customer for over 12 years now, going through a various problems with the Fronius IG-5100 inverter. We never had to get a replacement but as I see in my files we did swap out a daughter board.

The system is comprised of three strings of 34 each GEPVp-055 modules. We have a fusible DC disco before feeding the inverter.

The problem is two-fold: low, fluctuating AC power and low, fluctuating DC string current.

Under operation: 10:30 AM; temperature underneath PV modules 26 deg C; all modules have identical orientation; Irr (normal to PV modules)=427 W/m2, (12 deg pitch, bearing 267 deg)
Vdc=228V; Voc=326V
String #1: 2.54, 2.23, 2.66 A
String #2: 1.76, 1.80, 2.07, 1.50 A
String #3: 2.83, 2.96 A
Pac=1,174 W and fluctuating between 1,050 and 1,400

I checked the fuses on the input: 23 to 29 m-ohms, under load.

Since all three strings have fluctuating current, I suspect the inverter. But since string #2 is fluctuating much more, I worry about bad cell/j-box/DC-wiring.

I plan to gen up a ~80 ohm / 750 W load and check each of the strings at the disconnect.

So my question is has anyone heard of GEPVp-060 or -055 modules having problems? 

Peter T. Parrish
SolarGnosis
1107 Fair Oaks Ave. Ste. 351
South Pasadena, CA 91030
(323) 839-6108
peter.parrish at solargnosis.com

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