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Old 04-10-2016, 08:23 AM   #11
Join Date: Mar 2016
Posts: 32
To my solar buddies from a solar wanna be ...


I don't have solar (yet). Maybe a year or so. But solar panels work better when the are cool (ironic because you need the sunlight which is what gets them hot -)).

So what if you put Styrofoam underneath the panel. This will keep the reflected heat from the roof off the panel. Now the question is (1) will this help at all (2) should the foam be left white or black.

Are you in the position to try this experiment. My belief is that black is the better choice.


Is this a waste of time, IDK. I don't think so. If you look at the specification of your panel you'll see how quickly the efficiency drops off as the temperature of the panel goes up. At high temperatures: 80F-90F it falls off like a rock.

So if you can keep it below the 80F and down in the 70s, this might be a cheap fix.

jkot is offline   Reply With Quote
Old 04-10-2016, 03:23 PM   #12
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Join Date: Jun 2013
Posts: 177
I was told to leave a space under the panels for ventilation. My roof is white so I dont get as much heat build up as if it was black.

On my house, all the solar panels are at least two inches off the roof. Again , I was told this was to keep them cool.

BTW, an added by product of solar on my house, where the entire south roof is covered, is we haven't used AC in the three years the panels have been installed!

Rbertalotto is offline   Reply With Quote
Old 04-10-2016, 03:55 PM   #13
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Join Date: Mar 2014
Location: Mountain Foothills of Southern Alberta
Posts: 517
The heat generated is from the sun shining on the top of the panel, not from reflected heat off the roof. If you put foam under the panel it will insulate the panel, thus no air in contact with the underside of the panel to help dissipate the heat.


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