As far as I can tell, the biggest difference between Standard Test Conditions (STC) and PVUSA Test Conditions (PTC) is that PTC tests are performed in air which is 5 degrees cooler, and moving at 1 m/s. This cooler air and forced convection should allow the module to provide higher output, but it seems the opposite is true. I found a typical module with Pmax 220W STC is only 194W by the PTC test method.
Can anyone explain what I'm missing?
Thanks,
Can anyone explain what I'm missing?
Thanks,
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