That actually sounds very reasonable to me. The amount of power used to go from a stop, to moving at about 20 mph is HUGE. That's all I would expect to get out of a regenerative brake system. And all I would really want. This would save a lot of fuel for a gas/diesel powered car. I know you couldn't run the car off it for very long, that would be breaking one of those silly laws that states something along the lines of perpetual motion not being possible. However, you could recoup that energy, and recycle about 60 percent of the energy used to stop. That's my goal.
However, another question would be, would you save just as much energy, by keeping the vehicle lighter, and not putting capacitors, motors, and gears in it?
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