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The more load that is put on the alternator the more power is required to drive it. This is an interesting question and I really do not have the exact number. But I do know from spinning an alternator with my hand that is takes very little power to turn it when it is not connected to anything. But connect it to a battery that is dead and it takes some power to spin it. I would estimate it takes from 2-3 hp depending on the load.
#2 Approximately 1 HP is required to drive an alternator for every 746 watts of electrical power it produces. In practice 1 HP of mechanical power produces a little less than 746 watts at the output because of frictional and resistive losses.
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