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On a truly bright day, the panels covering a 1000 sq ft house can generate 10-13KW. That is twice what the central a/c unit uses. so cut it in half due to inefficiencies, and put in place a means to store one's power for night use, and there is a bargain (based on an 18 sq. ft panel making 250 watts).

How big is that Ikea store in the picture? If the panels supply even half of the store's lighing and air conditioning costs during the day, that is a huge reduction in energy use and lessinging the strain on the grid in summer.