It seems to be -0.5%/degC:
http://rredc.nrel.gov/solar/calculators/PVWATTS/moreabout.html
Original Message
Subject: [RE-wrenches] PVWatts Module Temperature Coefficient (was
Enphase derate)
From: Joel Davidson
To: RE-wrenches
Date: 2010/4/18 12:23
Wrenches,
PVWatts does
Wrenches,
PVWatts does not accurately predicate Unisolar and Sunpower module performance
because it uses a generic single crystal silicon solar module power temperature
coefficient (I think -0.4% per degree C). Does someone have the technical paper
that specifies PVWatts module temperature coeff
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