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it is as simple as this

know your volt (110, 220 ..)

know your amp

from the manufacture sticker usually on the back of the motor

and your load in watts = volt x amp

so if you are using a 1.5 hp motor that is amp rated = 7.0 at 220 v

then your watt = 220 x7 = 1540 watt = 1.54 kw

hope that will help

http://sawdustmaking.com/ELECTRIC%20MOTORS/electricmotors.html

thanks

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