Used Solar panel with "Blister" and Brown Patches
Hi guys. I have two questions.
First I intend to upgrade my off-grid solar setup by addition more panels. I got 2 used 220w panels from online but when they arrived I found that that one of the panel has small opening at the back (see attached) like a some blister. The corresponding surface area in front of the panel also bares mark of defect like a short circuit.
Both panels also had some patches of brown at the top right and left side and bottom of the panels. The brownish of the usually white part of the panel.
I ran a test on the panels using a multimeter and got good result. IMP for each of the panels (the one with the "wound" and without) was 7.9A . The VOC was 35. This was any 13:30 on a clear sky 38C day.
The panel stickers were out so no way to reference the above figures to manufacturers specs although seller claim them to be made by Lorentz the German solar company.
I attached each of the panels to a pwm charge controller connect to a 40A 12v AGM battery. (This was late afternoon around 15:30) I recorded about 3.4A, 20v) from each panel. I took out an older PV which I have hard for some time has a reference and it too gave similar output.
Here comes my Question:
Can I still use this panels? are they any good and what could be the cause of the brown patch, also I would have imagined that the panel with the "blister" would deliver a significantly lower power compared to the rest but the blister didn't seem to affect it. What could be the reason for this?
Is it something I can ignore or something that would get worse.Used Solar panel with "Blister" and Brown Patches
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