> I have also seen parallel regulators for panels but only for small ones
> (<200W). I do not think that the panel stays cooler if under load, its
> internal resistance will heat it up under load. Maybe I am missing
> something. The efficiency of the panel is too low for the energy
transfer
> to affect temperature afaik.

I was just guessing, but the panel should be slightly cooler under load.
Under no load, all the absorbed sunlight gets converted to heat.  Under
load, the panel still absorbs the same amount of sunlight, but some of it
(15% or so) gets converted to electrical energy and transferred to the
external circuit.  That 15% obviously can't be heating the panel no matter
what its internal resistance is.


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