Are there burn marks on the backing? I have had several entire array replacements in the past back in the 150-175 watt/module days. But not in a while.
Dana Orzel Great Solar Works, Inc. C - 208.721.7003 d...@solarwork.com Idaho Contractor - # 028765 Idaho PV # 028374 NABCEP # 051112-136 <http://www.solarwork.com/> www.solarwork.com "Responsible Technologies for Responsible People since 1988" P Please consider the environment before printing this email. From: RE-wrenches <re-wrenches-boun...@lists.re-wrenches.org> On Behalf Of William Miller Sent: Friday, June 26, 2020 4:06 PM To: RE-wrenches <re-wrenches@lists.re-wrenches.org> Subject: [RE-wrenches] Mass failure of Siemens SP150s Friends and colleagues: I recently performed a service call at a grid-tied installation we did in 2003. The homeowner noticed the daily consumption had declined to about 1/3 of typical sometime in the last year. Sure enough 2 of the three strings (30 mods in total) of Siemens SP150s showed low voltage. When I tilted up two of the racks to expose one dead string of 10, I found that 6 of the 10 panels had 1/3 or 2/3 of the expected OC voltage. Testing of the individual strings indicated that 1 or 2 strings were dead on each affected panel. Close examination revealed pinpoint heat damage on inter-cell traces. The diodes tested good. See photo below. I am surprised to see such a high rate of failure. Has anyone else experienced this with these or other panels? Is anyone servicing warranty claims on these ancient panels? I doubt there is much value left in the warranty but I am curious. Thanks in advance. William Miller
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