Although i cant vouch for 20 year old siemens, my siemens modules (14 yr old sp-150s) had an intermittent connection develop between the stainless ribbon that exits the back sheet and the terminal where the blocking diodes connect (3 diodes). They used a spot welder to join the materials. This had opened up - the small spot welds broke. Like I said, yours may be different, but might be worth a shot scoping out the integrity of these connections. This would be on the posts that feed the blocking diodes, so before the diodes.
Roy Rakobitsch NABCEP Certified Small Wind Installer® NABCEP Certified Solar PV Installer® Certified Advanced Tower Climbing, Safety & Rescue Wind/PV Design Engineer Windsine LLC 631-514-4166 www.windsine.org On Sep 16, 2015 7:47 AM, "Roy Rakobitsch" <winds...@gmail.com> wrote: > Ron, I replied a few days ago, ill fwd if you want. > > Roy Rakobitsch > NABCEP Certified Small Wind Installer® > NABCEP Certified Solar PV Installer® > Certified Advanced Tower Climbing, Safety & Rescue > Wind/PV Design Engineer > Windsine LLC > 631-514-4166 > www.windsine.org > On Sep 16, 2015 1:57 AM, "Brian Teitelbaum" <bteitelb...@aeesolar.com> > wrote: > >> Ron, >> >> I'll pipe in here. If the module "works" when he bypasses the diodes, then >> the diodes, or the solder connections on the ribbons or the diodes, must >> be >> at fault. >> >> I put "works" in quotes because we don't have the details on the meter >> readings. >> >> Brian >> AEE Solar >> >> >> >> -----Original Message----- >> From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] On >> Behalf Of Ron Young >> Sent: Tuesday, September 15, 2015 11:45 PM >> To: RE-wrenches >> Subject: Re: [RE-wrenches] panel failure >> >> Thanks Allan, I was wondering about the lack of response as this group is >> always very helpful. One begins to suspect the phantom cause, i.e. the >> rest >> of the story that wasn’t told to us by the customer. It happens from time >> to >> time ;-) >> >> Ron >> >> > On Sep 15, 2015, at 9:07 PM, Allan Sindelar <al...@sindelarsolar.com> >> > wrote: >> > >> > Ron, >> > The lack of response may indeed be your answer. I didn't reply because >> it >> > hasn't happened on my watch and I have no idea what would cause what you >> > describe. >> > Allan >> > >> >> 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 >> > >> >> _______________________________________________ >> 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 >> >>
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