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Hello, I have just tested the open circuit voltage of 3 new identical panels 140W-12V Mono in the same light conditions.
Two of the panels read identical voltages whereas the third is always around 1V less.
Is this normal ? I can't find the answer anywhere.
So two of the panels measure 22.4v and the other one 21.4V. Two came as a pair in one box and one on its own. The one on it's own reads lower plus has a blue tinge (nearest in photo) whereas the other two (one in photo) are black.
While you have your meter out, test your solar panels. before the sun goes away.
Tip, the grass shading the bottom of your panel might affect the Isc reading..
Hello klim8skeptic
I didn't test them there. I tested the panels flat on the floor. I even moved them around putting the panel in same place as one that measured higher seconds before with the same result. Same panel always measured less. Not a cloud in the sky. The above photo was just to show the blue tinge. I just want to know if a difference of 1V is normal. It is over 4% reduction !
