I am working on an electric longboard, retaining the original battery pack and brushless hub motors. I want to be able to control this with an Arduino. I want to know what size ESC I will need. The battery pack is 30V and the hub motors have a 1200W rating each. Will a 50Amp ESC be sufficient for each motor?
This is why we have Ohm's Law: I = P/E
- P = Power (Watts)
- E = Electromotive Force (Volts)
- I = Current (Amps)
You can calculate any of the factors given two factors:
I made an Ohm's Law calculator online here: http://www.rcrowley.com/eirp.htm
If you plug in 30V and 1200W, it shows that the current is 40A. So your 50A ESC should be adequate.