Solar Arrays. [RE-wrenches]

[Dean T. Newberry]

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Hi Carl,
What you want to do is increase the emissivity of the back of the panel.
Shiny stuff like alluminum foil and hi gloss paint have low emissivity.
Dull stuff like flat latex has high emissivity.
Color doesn't matter.
The rubber sheet on the back of the modules is probably in the middle to 
high end of the emissivity range.
I think it would be difficult to get flat paint to adhere to the rubber 
and stay there for 25 plus years.
When possible I mount PV over pool panels. Leaving 4" for ventilation 
the same as a plane fo roof mount. We estimate 30% shading losses, so 
add a panel or two to the pool heating to get the required insolation 
for that system.

cul  deant

Carl Emerson, Free Power Ltd. wrote:

> Hi there,
>
> I am interested to know if there is thought to be any advantage in 
> painting the back of solar modules black.
>
> My idea is to lower the panel temperature by increasing the radiant 
> heat and lowering the cell temperatures.
>
> Is my logic flawed ??  Most of the modules are light in colour on the 
> back.
>
> Thanks
>
> Carl Emerson
> Free Power Ltd.
> Auckland NZ
>
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-- 

 
* Cooperative Community Energy* 	*Dean T. Newberry*

430 D Street, Davis CA, 95616
Tel: 530 758-6064
Fax: 530 758-3684
Email: deant at dcn.org
Web:  CCEnergy.com       
      Talbott Solar <http://www.dcn.davis.ca.us/go/deant/>

Contr. Lic. # B-667908

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