Re: Watts to HP conversion.

["Peter VanDerWal" <vanderp@earthlink.net>]

>If memory servers me correctly, I can use the P=I*E formula to get the
>watts from
>a motors rating.
>
>Then if I divide that number by 745 (watts per hp) I should come out with
>the rated
>HP of a given electric motor.
>
>Is the correct?

>
>The reason being is that I found a 1/2 dozen Fasco 24v 5.4 amp motors and
>wanted to get the HP at a given voltage/amperage.
>


    You'd come up the the INPUT power to the motor, but without knowing it's
efficiency there is no sure way to know it's OUTPUT power.

    In your example you have 129.6 watts of input power.  Output power is
probably somewhere between  70 and 110 watts (assuming efficiency is
somewhere between 50% - 85% ).
    So this motor's output power is probably somewhere around 1/8 hp.
    For what it's worth, this motor sounds like it's about 1/2 as powerfull
as the ZAP motors, and they typically use 2 of them in a power-assist.