I suppose it depends on your definition of "car", but they've been doing this for many years in the World Solar Challenge. GM's Sunraycer drove across Australia

I suppose it depends on your definition of "car", but they've been doing this for many years in the World Solar Challenge. GM's Sunraycer drove across Australia in 1987 on solar power alone: http://en.wikipedia.org/wiki/Sunraycer http://en.wikipedia.org/wiki/Sunraycer.