two arrays [RE-wrenches]

[Bill Brooks]

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Travis,

Voltage is a function of temperature and current is a function of
irradiance. Once the PV effect is fully going at about 50-100 W/m2, the
voltage remains fairly constant. If the shade is above 50 W/m2, you can see
higher voltages than when the array is hot.

Partial shading of the array raises other issues about how the array is
wired so that series strings are either all in the sun or all in the shade
(not split between sun and shade).

Bill.

-----Original Message-----
From: Travis Creswell, Ozark Solar [mailto:ozsolar at ipa.net] 
Sent: Tuesday, April 26, 2005 7:12 PM
To: RE-wrenches at topica.com
Subject: RE: two arrays [RE-wrenches]

Bill,

Darryl mentions that his array is shaded in the morning.  That won't affect
the voltage will it?  I can't say that I've ever bothered to test the
voltage of a shaded array but I have observed a lot or arrays in cloudy
weather with what appeared to be voltages of what I would expect of the
array in full sun.

Travis Creswell
Ozark Energy Services, Inc.

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