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Voc much higher than specified on the back

evilkos said:
Thanks everyone for the quick and helpful responses! ?

I do think that it's a bit too high to just be due to temperature, but a valid point that Voc can be higher in lower [EDIT: initially typed "higher"] temps. Temp was around 30C as it was midday Brisbane and they've been sitting in the sun before picking up so they probably were even hotter. So yeah that's why I thought 55V is a bit too high but that was a panel that was cracked throughout. Others are much better but I haven't gotten around to measuring them.

I will probably start with just one, then a 2 panel string, to make sure I won't go over 100V max. I'm then planning to try 2s2p which I think Ecoflow Delta Max should be fine with. I have the blocking diodes and splitters for that as well.

Anyway I will measure the other panels tomorrow and see what the voltage reads! And will try my DMM on a known voltage like my car battery.

I'm curious what happens inside the panel that could lead to a higher than specified voltage, and how bad is it - does this indicate aging or a catastrophic failure?
Click to expand...
Sounds like you are having mini-arcs in your system. Lucky they're only producing 55Volt arcs although that is still dangerous. just from this, it sound like your meter might not be a problem, but the panel itself. Absolutely do not try to put in series or parallel with any other of your properly functioning panels.
 
Please show us the the screen shot of meter reading that show panel Voltage >50VDC.
Are you sure it is not 55mV since the panel is cracked?
Similar to wrong reading of the meter in the thread below:
diysolarforum.com

SOK Battery 112v on a 12V battery?????

Sometimes, you just have to ask the community, WTF??? Quote from customer inquiry: We had one battery reading 112v. He placed the battery outdoors. This morning the battery is reading 125v. We checked the voltage meter against several other batteries using 4 voltage meters. Only one voltage...
diysolarforum.com diysolarforum.com
 
Yep, y'all were right. The problem was with the multimeter. I finally got around to measuring the voltage (later than planned - life happened) and it shows around 27V in shade for all panels, including even the cracked one. Only after that my wife reminded me that the reading I saw was on the multimeter of the guy who sold me those panels. Likely it had a low battery and/or I misread mV as V.

Somehow slipped my mind that that day I forgot my multimeter and asked the guy for his, which was the source of this confusion. Mine seems to be perfectly accurate though. Lesson learned though - didn't know multimeters can do that.

Thanks everyone for the helpful replies! And sorry for the false alarm of sorts.

I can also share how it goes with Ecoflow Delta Max and those panels, but I forgot the damned cable for that, so that'll have to be later again.
 
evilkos said:
Only after that my wife reminded me that the reading I saw was on the multimeter of the guy who sold me those panels. Likely it had a low battery and/or I misread mV as V.

Somehow slipped my mind that that day I forgot my multimeter and asked the guy for his, which was the source of this confusion. Mine seems to be perfectly accurate though. Lesson learned though - didn't know multimeters can do that.
Click to expand...
You should send a thank you card to that guy's multimeter. It may be the reason you got those panels for the price you did. :ROFLMAO:
 
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