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there are experimental solar cars running off of cells glued all over the body, but It's tough to believe that a panel can charge a real car to run for a day. Small panels are commonly used to power some lighting, LED traffic lights and a lot of other things, but high current usages are something else.
Boiling water in "solar stills" is an old trick, with kits pretty common on sailboats and such, and there have been a lot of experimental solar steam generators. Almost built one myself with a parabolic relector and Pyrex tubing. A huge Fresnel lens could work, too.
Again, though, we're talking about the total installed cost and efficiency, and they're not quite there yet. All this stuff is fun to play with and may eventually work well, but it'll take some time to get it right.
Besides, where do you get all that water to boil in the desert?
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