I know there's a formula for this, but the only ones I can find online require a figure for efficiency. Maybe this is simply assumed? If so, I'm not sure what level of efficiency to use. Motor in question is on a power saw, rated 120V 60HZ 1800 watts 4100RPM. Anyone know this?
TIA
Dan
1 hp = 746 watts. A 100 hp motor is 75 kw. A 200 hp motor is 150 kw.
Looks like a 2 hp to me. 746 watts per horsepower at 82% efficiency sounds about right.
1800w equates to 2.41HP: as motors are generally built to nominally 'exact' horse-powers (smaller ones to such fractions as 1/4 or 1/2), I'd think it pretty safe, for practical purposes, to assume this one to be '2 HP'.
That would make the 'efficiency' 83% - quite plausible for such size.
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