I've heard it is very cold in deserts in the nights and a lot of sun in day time.
So that, probably, if you accumulate energy daily you get very cheap electricity with solar panels.
And if you run mining rigs only in the night when there is no cooling problem, it will be profitable enough in the end?
Otakama?
Unfortunately we aren't like the sahara in that aspect.
We have seasons and at night in the summer its still warm outside.
That being said I think that math would only work if you pay more for power then you mine, as long as you mine more then your power cost (including cooling and so forth) there is no reason to turn them off. Please feel free to correct me if I am wrong and missing something.
But you are right with the solar for sure we have an average of 330 days of sun per year