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.parr...@solargnosis.com
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