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Even napkin math would tell you this is not much of an idea if you're hoping for a free charge. Supposing they put flexible panels on the roof, perhaps 2 square yards @10% efficiency (flexible are not as efficient). If you parked at the airport in Tucson for 10 days, you might get 1Kw * 4 hrs * .1 efficient = .4Kwh per day = 4Kwh total in 10 days. Not very much - and that assumes you can park in a place at an angle to improve the orientation of the panels to the sun.
However, to prevent battery bleed down on an extended trip leaving the car at the airport? Might be almost mandatory.
However, to prevent battery bleed down on an extended trip leaving the car at the airport? Might be almost mandatory.