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You need about 1000 amps(remember we're dealing with only 12 volts) of power to enable an "electric" supercharger to operate correctly thoughout the whole RPM range of the engine. That would require 10 alternators on the motor. You would have to either carry about 1000lbs worth of batteries or mount 10 alternators, which would negate any gain you would get from setting it up.
First of all, you would have to have a HELL of an electric motor. A 5/10 hp electric isn't going to cut it.Not to mention those suckers are HEAVY! So you'll be adding a large weight to the front of the car.
Current draw? Herm, trying to run a large HP electric motor on 12V is going to take some huge amount of current.
You'd be better off having a small motor power a generator that then powers the electric motor, which in turn powers the supercharger.