[Serum]

You can't compare gas motors to electric.

the theory behind electric is that the higher the voltage, the more efficient the motor gets. A bigger motor has got more torque, that's why it doesn't need the rpm's to make the torque by gearing it down, like smaller motors.

It's very simple;

to produce 1500 watts with 100 volts requires 15A to make 1500 watt with 10 volts require 150A. Mostly, the higher the current, the less efficient. the more the internall resistance of the system becomes relavant.


Overall, a large lower KV motor runs less hot than a small high reving one. it is not said that a smaller high reving motor is more efficient. Far from that. (assuming it are both motors from the same serie)

I like a bigger low KV motor over a small high reving one. less heat means more efficient. A big motor has got more magnetical energy to power a car with more ease. resulting in less heat as well. When a magnet becomes hot it becomes less efficient as well, because of the magnet getting less efficient, it gets hotter etc etc etc..

The most efficient range of the setup depends on the gearing ratio, voltage and the resistance of the vehicle (mass etc)

Efficiency of electronics has got more to do with the high frequency of the electronics and the speed that the controller has to build up a clean as possible pulse. That's what makes a BL setup efficient. It's not about high rpm reving setups. . A setup certainly knows his sweetspot, mostly this point is under the 38000 rpms

It depends on so many factors.