<font size=2 face="sans-serif">Hi:</font>
<br>
<br><font size=2 face="sans-serif">I went to do some training at a large
utility scale site, (22MW) in Imperial Valley California a few years ago
and was curious about how hot the modules were. So, I touched the
back side of loaded and unloaded modules.</font>
<br>
<br><font size=2 face="sans-serif">The loaded modules were cooler. Not
what I expected. I thought the current flow of 9A would cause heating,
but on further thought from a physics point of view it makes sense. Electrons
carry 60% of the heat flow in metals which removes some heat and the cells
are also converting and thereby removing about 15% of the solar energy
from the cells.</font>
<br>
<br><a href="https://www.google.ca/maps/place/Slab+City,+CA+92233,+USA/@33.2450229,-115.4978262,1395m/data=!3m1!1e3!4m2!3m1!1s0x80d0b20527ca5ebf:0xa7f292448cbd1988"><font size=2 face="sans-serif">https://www.google.ca/maps/place/Slab+City,+CA+92233,+USA/@33.2450229,-115.4978262,1395m/data=!3m1!1e3!4m2!3m1!1s0x80d0b20527ca5ebf:0xa7f292448cbd1988</font></a>
<br>
<br><font size=2 face="sans-serif">JARMO<br>
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<br>
</font><font size=1 face="Arial"><b><br>
Jarmo Venalainen</b> | </font><font size=1 color=#008000 face="Arial"><b>
Schneider Electric </b></font><font size=1 face="Arial"><b> | Solar
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<br>
<table width=100%>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">From:</font>
<td><font size=1 face="sans-serif">Mark Frye <markf@berkeleysolar.com></font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">To:</font>
<td><font size=1 face="sans-serif">RE-wrenches <re-wrenches@lists.re-wrenches.org>,
</font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">Date:</font>
<td><font size=1 face="sans-serif">09/10/2014 08:43 PM</font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">Subject:</font>
<td><font size=1 face="sans-serif">[RE-wrenches] Cooler Modules</font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">Sent by:</font>
<td><font size=1 face="sans-serif">"RE-wrenches" <re-wrenches-bounces@lists.re-wrenches.org></font></table>
<br>
<hr noshade>
<br>
<br>
<br><tt><font size=2>Folks,<br>
<br>
Two identical PV modules are mount in an identical fashion and exposed
<br>
to identical irradiance.<br>
<br>
One module is open circuit. The other is connected to a load and <br>
producing power.<br>
<br>
Is there a difference in the temperature of the two modules? If so, <br>
which one is cooler?<br>
<br>
Mark Frye<br>
Berkeley Solar Electric Systems<br>
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