Hot solar panels

Today was hot. I think like 95F and mostly sunny and humid.

Anyway, the PV (solar electric) panels didn’t like it. They made 31.9 KWh vs 35.8 a few days ago (with what looks like a similar mix of sun and clouds). It was probably 75 or 80 that day?

So that’s 11% worse performance right there.

35.8 – 31.9 = 3.9 and

3.9/35.8= 11%

And compare that 35.8 to a cold day and that’s another 10% I am sure!

In my Enphase history I see plenty of sunny days above 42 KWh, so a day with a few clouds could easily still be 40 KWh.

Anyway, just sayin’. Our roof mount panels have a fair bit of a space below them. I bet if they were quite flush mount the heat would be even harder on them.

Some day I will rig a big cheap LASKO window fan up on a ladder and compare the output of the cooled-off row via the Enphase page.

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