[RE-wrenches] panel failure

[Roy Rakobitsch]

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" <solareagle at 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
>
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