Great thanks for the reply Jay, at least I know someone else has seen the same thing. Odd that it would just happen on 4 panels unexplainably. Maybe a transient from a lightning strike or something.
Ron > On Sep 16, 2015, at 7:37 AM, jay <jay.pe...@gmail.com> wrote: > > HI Ron, > > I have seen this a few times. And just a month or so ago. > > You can measure VOC and its right. You can measure ISC and its right, but no > power. > > As someone said, there is a weak/bad connection. Usually its on a main > ribbon. > Its just barely making connection. Enough you can get VOC. And when you go > for ISC with good sun, it’ll arc and give you good connection there. > But for reasons I don’t understand, it doesn’t always make that connection > for power. > > I even had one module that if you shorted it (ISC) and then connected it to > load it would work, but next morning, nothing. > > I’d check the junction box first, but you might also find something in the > main ribbon connections. A thermal gun might find it. > > good luck, > > jay > > peltz power > sent 7:37am 9/16/15 > > >> On Sep 15, 2015, at 8:30 PM, RM You <solarea...@solareagle.com> wrote: >> >> Just wondering if any esteemed wrenches have an idea what could cause this >> problem? Customer says nothing unusual happened that he is aware of and the >> panels had been working fine for many years but now 4 of 6 panels just quit. >> Doesn’t appear to be a diode failure. >> >> Ron >> >>> On Sep 11, 2015, at 4:58 PM, RM You <solarea...@solareagle.com> wrote: >>> >>> I have a customer who has 6 siemens 48w panels that are 20 years old >>> (hooked in parallel to a 12v battery). He says that 4 of them have failed >>> in that there is no output unless he bypasses the diodes. However he pulled >>> the diodes and checked them on a diode check and separately on a battery >>> with a light bulb and they appear to be functioning correctly. Any ideas >>> what could be causing this anomaly? >>> >>> Ron Young >>> >> >> >> > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > _______________________________________________ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
