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For the amount of space they require that's all they can do in a car. It's a nice idea but I don't see it as 'economical' because it can't run the A/C (I'm told) and even if it can the pump is still attached to the motor eating up HP.
Best application of a solar panel for auto use? Tractor/trailers. Semis. There's about a hundred things you could do with that much square footage of solar panelling, and the weight of a few more batteries will not affect the terrible economy of a semi.
Do you know how much fuel they burn just to stay warm/cold when they're not driving?
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