Battery Vehicle Society

Can someone confirm the rating of the C5 motor for me?

Was talking to my Dad at the weekend about the various EV projects I'm considering, when he pulled out a pair of C5 motors and controllers and asked if they were any use.

Looking at them it says 12v 29 amp, so 350w, but that sounds surprisingly low for the physical size of the motor!

Well, 350 Watt is nearly half a horse power.

The size of a given motor for a given power rating is dependant on the rated rpm.

I had a 3.5hp motor that weighed over 200lb, but the rated rpm was 754.

Interesting, thanks for that.

Does that theory apply to all motors, as in it's the wind configuration that gives the trait? I'm used to smaller motors - Brushless mostly - for RC heli's and aircraft, and have some similar power (relatively low RPM) ones that are about 1/10th the size!

Mostly it's a thermal rating. The C5 motor is rated to produce not less than 350 Watt continuous at 25C ambient and with no external forced cooling.

Your RC motors are almost certainly peak rated and have a great big cooling fan bolted to the front.

right, makes sense Many thanks.