12thgenusa wrote:
BFL13 wrote:
I did not get the temps to answer the OP question, sorry. I did feel the panel quite warm, well above ambient about 12C. Voc was 34.7 instead of rated 36.8 at 25C which goes with warmer panel
Guessing your panel NOCT of 45C the calculator gives a panel temp of 37.6C. How do you measure the irradiance?
I did not measure it, I used your calculator with latitude and date.
I used to ASSume I had 1000 if I got full rated Isc, panel disconnected. Now I am not so sure about that, but it still has to be close, since the coefficient isn't much compared with voltage's coefficient.
Is panel cell temp same under as on top? I could put a thermometer underneath on the back (raised panel no trapped heat) whereas on top the thermometer would be in the sun, so not sure what it would be showing.
