[RE-wrenches] Cooler Modules

[Jarmo.Venalainen at schneider-electric.com]

Hi:

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.

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.

https://www.google.ca/maps/place/Slab+City,+CA+92233,+USA/@33.2450229,-115.4978262,1395m/data=!3m1!1e3!4m2!3m1!1s0x80d0b20527ca5ebf:0xa7f292448cbd1988

JARMO
_____________________________________________________________________________________ 


Jarmo Venalainen  |   Schneider Electric   |  Solar Business  |   CANADA | 
  Training & Development Specialist - Senior 
Phone: +604-422-2528  |   Fax: +604-420-1591  |   Mobile: +604-505-0291 
Email: jarmo.venalainen at schneider-electric.com  |   Site: www.SEsolar.com 
|   Address: 3700 Gilmore Way, Burnaby, BC V5G4M1 


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From:
Mark Frye <markf at berkeleysolar.com>
To:
RE-wrenches <re-wrenches at lists.re-wrenches.org>, 
Date:
09/10/2014 08:43 PM
Subject:
[RE-wrenches] Cooler Modules
Sent by:
"RE-wrenches" <re-wrenches-bounces at lists.re-wrenches.org>



Folks,

Two identical PV modules are mount in an identical fashion and exposed 
to identical irradiance.

One module is open circuit. The other is connected to a load and 
producing power.

Is there a difference in the temperature of the two modules? If so, 
which one is cooler?

Mark Frye
Berkeley Solar Electric Systems
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