The question I have always had is, what happens to those things when the sun doesn’t shine, and doesn’t shine for a long enough period of time that the storage batteries run down? I guess then we do without those things. That’s okay for a highway sign, but I sure wouldn’t want to be caught in the middle of a mid-continent winter without reliable heating, or a humid Florida or baking hot Arizona summer without A/C.
>>baking hot Arizona summer without A/C.
Has there ever been a baking hot summer in AZ without lots of sunshine? Heck there is lots of sunshine there in January, which is why they don’t bother with ‘daylight savings’. Such places make more sense for solar than any other in the country.
I agree about mid-continent winters, and Florida/SE Atlantic/gulf coast states, more because of the inherent fragility of solar panels when hurricanes arrive.