I have checked the open circuit current and the short circuit as well.
Open circuit is OK, but the current is not.
I have tried full sun current into a load and sometimes is puts out 4 amps and sometimes .4 amps.
I think it is a problem in the panel.and have checked all of the connections.
Before we left I thought I could count on the 4 amps (maybe 40 - 50 watts) but going into Yellowstone where I needed it .4 amps.
At the time the battery voltage was 12.5 I checked the current from the controller to the battery as well.
Sometimes the controller would show the solar panel
shut down for the night.
I suspect a bad internal connection.