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if you were to use a cog belt instead of a v belt that would take care of alot of the friction issues, then it would just be spining weight and the air drag that some alternators have of their crude fan so a better fan might be in order as well.
you can get dc/dc converters that will drop voltage down from 24 or 48 or even 144 volts dc down to 12 or 13.2 volts dc for running lights in electric cars off the traction battery.
if the alternator is not hooked up to a load then it's field coils are off as well and it's just dead spinning weight.
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