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‘World’s first off-road solar SUV’ just drove across Morocco powered only by the sun
(edition.cnn.com)
This is a most excellent place for technology news and articles.
silicon solar panels are at their limit which is something like 30% efficient. Newer chemistry will go beyond that but as the other comment said even with double the power there isn't enough energy in sunlight for a car sized panel to get a car going for too long. Especially when there are clouds out (most of the time here)