Solar panel 24V to 12V conversion & rating tests.

Submitted: Wednesday, Jan 01, 2014 at 06:12
ThreadID: 105636 Views:10677 Replies:8 FollowUps:63
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Disclaimer all the information here please use caution at your own risk, solar panels do hold electrical currents which are dangerous and cause injury or even death.

Recently I ordered a 200 Watt 12V solar panel. Tests proved that is was not 12V but in fact a 24V panel. Thanks to knowable members of this forum who confirmed this.

The company who sold the panel refused a 15day money back guarantee. Then said he would send a photo how to re-wire the panel to convert it to a 12 V panel. Today I received these photo's from an unknown source. I am presuming they come from the seller.

In this thread I will show the photo's I received & how to test the ratings of the panel. I will also follow up with my results after testing.

Photo 1.
On the back of every solar panel is a Terminal box.


Photo 2.
Inside the Terminal box 24V wiring.


Photo 3 & 4.
Adding this jumper lead now 12V ?



After I have jumped the wires as seen I will apply the multi meter tests which should show 22V Voc and Isc 11.15 amps reading in perfect light conditions.

Doing these tests sample photos.

This image shows a test done on the 24V panel the Isc reading of 6 to 7 is well below specs. of bought panel, it should of been 11 or more.


Here's a guide I put together for testing solar panel ratings.


Comments from any members are welcome in particular if you see something wrong, please let use know asap before I begin.


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