I have seen the solar panel on the roof of my caravan pumping 2.5 amps into the leisure battery, (and its not a big one) so the roof of a car should provide ample real estate to maintain a system battery on a car thats on standby.
The issue is that its an expensive thing to design and engineer a solar roof in a car.
Last edited by: Zero on Sat 9 May 20 at 20:52
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