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Very interesting idea. I've had the idea of using a microswitch on the accelerator to turn it on when the accelerator is not being depressed. But I liked your idea since that would turn it on only when decelerating, so not at idle.
Except it could turn on if stopped on a downhill incline. But that's not necessarily something that's going to happen often, depressing on where you live and drive.
The only other idea would be to have the alternator turn off when there's no speed from a speed sensor.
Of course if you add a start-stop system then charging at idle, even stopped on a downhill grade, wouldn't be a problem
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