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). There 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.
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 11, 2015 6:58 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 > >
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