Testing Solar Panels

it depends what you are getting at.  if you want the info for your own knowledge, test the array.  if you know what it can do, you can design loads or system expansion accordingly.

 if you are trying to prove warranty claim issues, good luck.  you will have to test each module individually, as well as verify the conditions in which you test.  after 5 years, modules should probably be in the 85 to 95% of rating.  the problem is STC conditions are often not realistic so even if you did test them and it was 65% of stc rating, that would be 85% of ptc, and you would have no way of verifying either condition anyway.

james Alt-E staff