PV Inverters module strings [RE-wrenches]

[solplex at montana.com]

Bill Brooks.  Bill, I remember your presentation at a Schott grid-tie
class and you seemed to have a good handle on some of this stuff.  To
figure out panel voltages we need to figure out the temperature at the
panel.  All sorts of numbers are used to describe the difference between
ambient and panel temp, and in general the difference between summer hot
ambient and panel temp is assumed to be the same as the difference
between cold ambient and panel temp.  Is that a reasonable assumption?
And what are reasonable estimates for these ambient/panel differences?

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