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Solar Panel Fun - Is it dead or is it alive...


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I had a panel that had been underwater and the copper ribbon behind the connector had turned to green dust. I dug it out with a knife to get to intact ribbon and soldered 2 new wires on then sealed wi

Cheers KM - i have two identical panels, and one is working mint so got a pretty good test bed.

I hate throwing stuff away that i cant explain how they are broken! So curiousity will probably have me buy a new one for the boat, then play with this one at home to learn some more.

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No worries, they are there if you need them.

 

Let us know how you go. I've never really had any pushing need to trouble shoot things like that but now I'll need to lift my game so keen to follow real life things like this.

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Haha they were in the sun - hence one of them works one doesnt.

 

@CrazyHorse - not really in that when you measure the Open Circuit voltage the current isnt at 5amps. Likewise when you measure the short circuit current the voltage drops a little. you cant measure the two together and get that.

 

@StrayCat - Panels are probably 5 years old but they were bought by previous owner of boat so not sure where from etc. there is diodes in the connector box on the back of the panel itself.

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often the cells have a good warranty, but the panel itself does not. Worth reading the fine print on any new panel.

The diodes can of course fail on a panel like that. If they can be accessed  they can be tested and replaced if required, but on many panels this is impossible - destroys the panel.

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Sounds like a diode or a join in a string of the cells has gone, 9v at Short isn't bad for a 100w panel but it is a touch low. For example here is a different 100w panels volts/amps curve:

 

HmHaokV.png

 

Can you get us a picture of the black box on the panel with it's lid off if it comes off? Under the glass on the panel can you see any black/soot like marks between cells?

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