Megger testing Solar Panels - identifying ground fault

The insulation value between the solar panel frame and the MC4 circuit must be about 40 MOhms for panel to be within warranty. Anything lower than this indicates a failed panel.

Note that I turned the panel away from the sun so the MC4 connectors did not arc when I plugged them in. It is important that there is zero voltage on the string you are testing.

[miteeman]

This is the only video I've seen showing this procedure and thanks for the tip about soapy water. I've tried pressure washing panels on the ground to force the short. I wonder if the soap helps? I guess it would allow water to seep in more quickly. Maybe next time you do this you can show what it looks like on a bad panel

[rollandelliott]

So if I just have a multimeter. I set it to read ohms and then connect the mc4 connectors together and put one lead on frame and one on the mc4 and anything less than 40 mph s is bad?

[DigZworld]

If Multimeter will read up to 60M Ω, can I use it to perform this test?

[kurtlowe]

Trina solar panel procedure says <50M ohms is a fail point in the panel but reading your description says opposite. What kind of panels are you testing?

[gsxr]

Damn .
MC3 connecters... old ass panels..haha