How much horsepower is required to drive a 100 amp alternator?

To determine the horsepower required to drive a 100 amp alternator, you can use the formula: horsepower (HP) = (Voltage × Amperage) / 746. For a typical automotive system operating at 12 volts, the calculation would be (12V × 100A) / 746, which equals approximately 1.61 HP. This means that about 1.61 horsepower is needed to drive a 100 amp alternator effectively.