Before conducting the test you should know how many solar panels were connected in series in the string in question and how many bypass diodes each panel has.
How to test solar panel diode.
Set the meter to above 200 vcd to ensure you get the most accurate reading possible.
Multiply that number by 0 4 volts to find the amount of voltage that should cause the bypass diodes to become conductive.
E marine walks you through testing a solar panel s output to make sure it s performing correctly.
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Feel free to ask any doubts regarding this video.
Make sure it is actually installed the right way.
You will want to ensure that you place the positive to positive and negative to negative when attaching your multimeter to the connection on the back of your solar panel.