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Old 09-22-2005, 04:13 PM   #15
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Originally Posted by GlenCoombe
So at 275 amps how many horse power would that actually take to turn the alternator?? Bigger sometimes can be overkill. Just my two cents.
How many horsepower? Probably ALL of it!
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Old 09-22-2005, 08:35 PM   #16
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Cool Was this a rhetorical question?

Quote:
Originally Posted by GlenCoombe
So at 275 amps how many horse power would that actually take to turn the alternator?? Bigger sometimes can be overkill. Just my two cents.
Not as much as you would think. Maybe 35 horsepower at maximum output. I just ran the figures, and it comes out to 33 horsepower, add a couple for mechanical loss.
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Old 09-23-2005, 12:39 AM   #17
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275 amps x 12 volts = 3,300 watts; at 746 watts/HP (yes, this number is correct), this equals 4.42 HP. Figure 60% efficiency, and you're looking at 7.37 HP to run the 275 amp alternator at full output.

Bob
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