[amsat-bb] Re: Solar Power (I was wrong)

[G0MRF@aol.com]

In a message dated 02/10/2009 18:41:31 GMT Standard Time, bruninga at usna.edu 
 writes:

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.)
 
_http://www.sunnyportal.com/Templates/PublicPageOverview.aspx?plant=7350f0ac
-1a01-4248-89cc-90607f32caaf&splang=en-GB_ 
(http://www.sunnyportal.com/Templates/PublicPageOverview.aspx?plant=7350f0ac-1a01-4248-89cc-90607f32caaf&spla
ng=en-GB) 
 
If you want to check out the efficiency of an installation near you, just  
have a quick search of the "publicly available plants" at 
_www.sunnyportal.com_ (http://www.sunnyportal.com) 
 
David  G0MRF