Quote:
Originally Posted by Mikesolar
Panels are tested at 25c and 1000w/m2. A cell will be tested in the same way but it does not take into account the glass, losses with stringing them together and the fact that the heat will make them degrade roughly 0.4% annually unless you can keep them cool. This is why the manufacturers warranty the product with the degraded power output over 25 years.
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Have you seen them degrade that much in the field?