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While I agree that the solar output from a car roof isn't there, I'm sure one of the cars I was looking at had or had the option for roof solar panel. I think it was defined as "maintain battery charge while parked. "
I assume this would be to offset the alarm power consumption/ having your 4 wheeled PC on standby.
Grumpy_Git
Bernhard
Solar panels don't really have enough output to make a meaningful difference. Technology isn't good enough, surface area isn't very big, roof frequently points in the wrong direction or is obstructed.