seasonal tilt gain [RE-wrenches]

Doug Pratt dmpratt at sbcglobal.net
Sun Feb 13 16:55:56 PST 2005


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Crunch numbers? Hey, make it easy Conrad. The NREL Redbook gives you average
kilowatt hours per month at latitude, latitude + 15 degrees, and latitude -
15 degrees. (Plus at 0 and 90 degrees, and with single or dual axis trackers
just in case you want ALL your options.) It covers hundreds of US sites with
actual data collected 1960 thru 1990. It's all on pdfs, download the whole
enchilada, or individual States here:
http://rredc.nrel.gov/solar/pubs/redbook/ 

And just in case you want the really easy answer, it's about 5% to 7% gain
for most of the US if you adjust tilt twice a year.

Cheers,
Doug Pratt
DC Power Systems 

-----Original Message-----
From: Conrad Geyser [mailto:conradg at cape.com] 
Sent: Sunday, February 13, 2005 3:06 PM
To: RE-wrenches at topica.com
Subject: seasonal tilt gain [RE-wrenches]


Has anybody crunched the numbers on seasonal tilting of PV panels?  Like
what overall gain could one hope to get?
Conrad Geyser
Cotuit Solar

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