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Recharging EV Batteries with Alternators and Regulatorsby David Why don't EV systems use alternators and regulators to recharge the batteries and run the motors? Hi, David - I get this question a lot! Answer: Because the energy has to come from somewhere. The law of conservation of energy is a basic principle in physics. Electric cars use electrical energy stored in batteries as fuel. The electrical energy powers the electric motor, which then turns the wheels and you are carried down the street. Alternators turn mechanical energy into electrical energy, which, in your gas-guzzler, seems almost like a freebie! But it's not. You paid for it already when your petroleum-based fuel turned chemical energy into mechanical energy. An AC electric conversion has regenerative braking so efficient that it puts nearly all the wasted braking energy back into the batteries, so it's almost as you say; but you've still got to recharge your batteries sooner or later. Perpetual motion is only possible if no energy is spent on moving the car down the street...which kinda defeats the purpose; ) Regards, Lynne
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