[QUOTE=gingerbreadmaniac]I would go along with the fact most alts dont run at full amperage constantly (duty cycle) but for it to take 1 horse for every 25 amps i dunno thats some pretty large inefficiency, the mathematicle equation puts 1 hp at 745 watts thats 62 amps at 12volts.
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Most gen sets are sized at 500 watts per HP through the smaller sizes. You have 4 HP and need about 1.5, I'm sure you'll be fine.