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Wait! Couldn't it be a little baby switch? It would never be closed when at 144v. When it's open, the car is 144v, and closed, at 72v. That way, when you are charging, the switch just has to handle like 10 amps or so, and when it's open, the monster current would be not going through the little switch. I haven't thought it through very well, but it might be true?
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