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Maybe you have heard about Sonomotors and its futuristic electric car, the Sion. If not, here is the link to its website: https://sonomotors.com/

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Anyway, the manufacturer claims that this car can recharge up to 30km on one day using its own solar-cells.

I have come to Physics Stackexchange, because I want to know: Can this be true ?

(I am looking for well-researched, fact based, answers without any bias for or against this car.)

EDIT: got some good answers... but let's really crack it down... Can we chose Germany for instance, look at the solar radiation per month and compute an expected range per month?

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It could well be true, but that doesn't mean it is useful.

Pick a day in the middle of summer, with a clear sky. Go to a flat test track. Spend 6 hours (three hours each side of midday) driving round it at walking pace, say 5km/h.

Oops, I forgot to tell you to inflate the tires to 50% higher pressure than normal, to reduce rolling resistance. They won't blow if you are only doing 5km/h on a perfectly maintained surface.

Congratulations, you have now traveled 30km in a day using only solar cells. But so what?

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