On electric driven motors for fans or A/C components you can generally work backward and figure out how much power that it takes by looking at the wire gauge, and then assume a 20% loss on efficiency.
For example, a 12 ga wire is good for about 20 amps. A 10 ga is good for 30 amps
20 amps x 14.4 Volts / 748 watts per HP
= .385 HP
More or less 1/2 of a HP. It doesn’t sound like much but it does add up.
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