More Solar for "Us"
Ok, I went off.the deep end? Bought 3 used 37watt uni-solar panels and a blue sky 2000e controller for the hefty price of $400, They were being listed as 75w panels, they are not The tested open...
Forum Discussion
I'll take you up on that bet any day of the week. If you factor in wind and convection currents that help remove heat from the top of the panel, then the heat flow on the top side is much better than the bottom side. The thermal conductivity of fiberglass (0.04 W/mK) is almost as bad as air (0.024 W/mK). For comparison, glass is 1.0 and aluminum is 250 W/mK. On the bottom side, the heat needs to flow through the thin skin of fiberglass perhaps a half meter in length, and then conduct out to air. We're talking about extremely high thermal resistance.
Sal
Sal
pnichols wrote:
I'll bet that the lower surface attached to the roof is a better heat conductor than the Uni-Solar's upper surface that is exposed to only air.
