PV: RE: typical shaded V-I characteristics

[Tracy Hooker <thooker@psl.nmsu.edu>]

If you are talking about shading an entire PV panel, then yes.  For all 
practical purposes, the current output of a panel is directly related to 
the amount of sunlight hitting it.  Say, if the panel put out 3.7 amps at 
full sun, assuming 1000 watts / square meter.  If a cloud came by and the 
amount of sunlight went to 100 watts / square meter, the current available 
would be .37 amps.  Voltage changes a little, but I would not worry about 
it.  It changes more from the temperature of the panel decreasing than it 
does from change in illumination.  Solar panels (or single cells) make 
dandy illumination sensors, and are used on every spacecraft put into orbit 
as a sun sunsor.

Tracy

-----Original Message-----
From:	Tom Painter [SMTP:painter@magnet.fsu.edu]
Sent:	Tuesday, January 18, 2000 11:27 AM
To:	pvusers@crest.org
Subject:	PV: typical shaded V-I characteristics

I have a question that someone out there may be able to
easily answer from their experience.  Is there a typical
percent reduction in value of the V-I trace between exposure
to full sun versus the "shaded" situation?  Any comments
would be appreciated.

Thanks,

- Tom

_____________________________________________
Tom Painter					
Associate in Engineering
National High Magnetic Field Laboratory
Florida State University

Phone: (850) 644-5752
Fax: (850) 644-0867
E-mail: painter@magnet.fsu.edu
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