Toyota made a Prius roof solar panel available as a REALLY EXPENSIVE option in 2010. It charged the 12 volt battery as and when.
They are apparently trialling a new version, that adds yer actual range:
www.theverge.com/2019/7/5/20683111/toyota-prius-plug-in-hybrid-solar-roof-range-electricity-energy-environment
I suspect it will no longer be REALLY EXPENSIVE, but it might be EYE-WATERINGLY EXPENSIVE instead.
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