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--></style></head><body lang=EN-US><div class=WordSection1><p class=MsoNormal>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.</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The system is comprised of three strings of 34 each GEPVp-055 modules. We have a fusible DC disco before feeding the inverter.</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The problem is two-fold: low, fluctuating AC power and low, fluctuating DC string current.</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>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)</p><p class=MsoNormal>Vdc=228V; Voc=326V</p><p class=MsoNormal>String #1: <span style='font-size:12.0pt'>2.54, 2.23, 2.66 A<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'>String #2: 1.76, 1.80, 2.07, 1.50 A<o:p></o:p></span></p><p class=MsoNormal>String #3: <span style='font-size:12.0pt'>2.83, 2.96 A<o:p></o:p></span></p><p class=MsoNormal>Pac=1,174 W and fluctuating between 1,050 and 1,400</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I checked the fuses on the input: 23 to 29 m-ohms, under load.</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>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.</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I plan to gen up a ~80 ohm / 750 W load and check each of the strings at the disconnect.</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>So my question is has anyone heard of GEPVp-060 or -055 modules having problems? </p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Peter T. Parrish<br>SolarGnosis<br>1107 Fair Oaks Ave. Ste. 351<br>South Pasadena, CA 91030<br>(323) 839-6108<br>peter.parrish@solargnosis.com</p><p class=MsoNormal><o:p> </o:p></p></div></body></html>