How hot does the back of the PV Panel get?

by Paul
(Cape Town, South Africa)

Hi I just discovered today that the efficiency of the PV panel go down by as much as 20% from about 40C onwards.

Do you know how hot the back of the panel gets as I reckon hosing down the panel would use too much water if you had to do it from about 11am until about 4pm.

However, it the panel cannot be effectively cooled from the back that would be the only option.

Thanks

Paul

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