Dave,
Thank you. PVWatts does not predict accurately Unisolar (-0.21%/degC) or
Sunpower (-0.38%/degC) or Sanyo HIT
( -0.336%/degC). In Los Angeles, I measured 6% more annual kWh from Unisolar
over a 3 year period and over 10% more from Sunpower so far this year.
Joel Davidson
----- Original Message -----
From: "Dave Click" <davecl...@fsec.ucf.edu>
To: "RE-wrenches" <re-wrenches@lists.re-wrenches.org>
Sent: Monday, April 19, 2010 7:01 AM
Subject: Re: [RE-wrenches] PVWatts Module Temperature Coefficient (was
Enphase derate)
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 <joel.david...@sbcglobal.net>
To: RE-wrenches <re-wrenches@lists.re-wrenches.org>
Date: 2010/4/18 12:23
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 coefficient? Thank you.
Joel Davidson
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