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Christ just reminded me what Toyota's solution to your problem was. The new Prius has a factory solar panel option. The solar panels run the blower motor at a low speed so your car is not an inferno when you park it in the shade. So even a Prius, with all its software and its huge traction battery, can't come up with a way to store the power of the sun.
I'd mount an alternator kill switch and a voltage gauge on the dash. If you have a handful of sunless days in a row, or a long road trip, you can turn the alternator on.
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