I highest temp I saw on the back of my 220w panel was 120*f midday. The mid 80's seemed to be where the heat affected the outputs but only a volt in VOC, half a volt in IMP, less than a half a amp in SOC and MPPT. Between the mid 90s and 120* at noon there was little change. A breeze cooled the panel from 120 to 94 and the MPPT amps went up .1 amp.
This was my Canadian solar 220w Mono panel. It is rated for a VOC of 36.6V, 7.33A SOC, IMP 29V I believe. I saw between 34 and 35.5v VOC, up High 7s to mid 8s SOC, 26.5-27V IMP, 155-160w and high 11s to 12.3a in MPPT. It tracked the sun from 10:30 am till 4:30 when clouds came up in the west. The watt hours meter went up just under 800w.
