[amsat-bb] Re: Solar Power (I was wrong)
G0MRF at aol.com
Fri Oct 2 13:28:37 PDT 2009
In a message dated 02/10/2009 18:41:31 GMT Standard Time, bruninga at usna.edu
Again, there is a BIG difference between solar design for
stand-alone battery systems (must point south, optimum angle,
etc) and grid-tie systems that can be anything from SE to SW and
even FLAT and still be only a few percent off peak!.
Sorry Bob, But a few percent is certainly not correct for the
installation I'm responsible for.
I have a set of panels pointing at the horizon at my local school and they
are about 40% down at midday.
The efficiency is directly related to the amount of sun falling on the
panel....well some relationship to the tan of the angle in radians....or
whatever it was I calculated and then measured. Actually the angle to the sun
is critical for max efficiency. (Obviously missed completely by the %7'!**
who approved this installation.)
If you want to check out the efficiency of an installation near you, just
have a quick search of the "publicly available plants" at
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