This is going to be a short post, because the idea is simple.
It is obvious that under extraordinary circumstance, e.g. a hurricane, entire power grids could go dark for hours, days, weeks, even months, when the only ACs left running the whole time would be those on solar power and/or wind power.
Under ordinary circumstances including the average hot summer day, peak-hour demand could cause city-wide blackouts, just when the mercury goes the highest. Not only would the off-grid solar powered A/Cs and solar generators keep on working but keep on working at peak efficiency during the hottest part of the day – exactly as should be. A more beautiful coupling between two separate technologies is hard to find.
So, how much does one such solar-powered air conditioning system cost? There are several integrated systems on the market priced in the mid-$2,000 range. Having checkout the components, I could probably put together a well-matched set for you for $1,500 or so. You even have a choice between wall-mounted A/Cs or portable A/Cs.