Hmm i thought we were talking about Solar Cars not other items such as servers. I know for a fact that Solar powered cars are up to supporting themselves and going at the rate of a standard car. Last years
World Solar Challenge was to create a Solar Powered Car that looked pretty much like a normal car. However I imagine that there may be a few issues for those countries where it is not light outside a lot (Eg. It rains a lot in England, Other countries theres only a few hours of sun in a day at particular times of the year, etc etc).