3×40W
How to test the solar panel
Method 1: use a multi-meter
Set your multi-meter to measure DC voltage and put the red probe on the red MC4 cable and the
black probe on the black MC4 cable (this is the solar panel’s direct output), make sure the
connections are secure. the open-circuit voltage should be displayed on your multi-meter and it
should be around 17.6V-23V.
If you’re not getting something within that range or close to those numbers, you should check and
make sure the solar panel is in direct sunlight and that the connections between the MC4 cables
and the multi-meter is secure.
