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Toyota Prius Prime PHV test vehicle with solar panels in JapanSeveral companies have recently proposed placing solar panels on top of electric cars to give them extra range. First, there was German startup Sono Motors, which the company says can get up to 21 extra miles from 330 solar cells, making up a 1.21 kilowatt array spread over its roof, hood, and doors. Then came World Solar Challenge team Solar Team...