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Using the Model S motor as a generator

Seems like the car has an efficient regenerator. What would happen if I raised the car on a jack and turned the wheels by an external gas powered engine. Alternatively you could tow the car for a while. Could that charge the battery in a few hours? If yes that could be another way to charge the battery - install rollers that turn the wheels to generate electricity.

I'm sure either of those is technically possible...but I'm sure both are considerably less efficient (and therefore more expensive) than the electrical generation your local utility does.

There's a great Russian video somewhere of an EV being towed (by rope) behind a truck, with regen on full recharging the battery. ;p

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