[E-Revonut]

amp(current) is the cause of heat. Amps x voltage = watts(power) If you increase the voltage your current goes down to make the same power. This is only true if you change your gearing as voltage goes up.

Ex. a setup using 4s 14.8V making an peaking at 1500 watts will draw a peak current of 101 amps - 14.8 x 101.35 = 1500. Now on 6s 22.2 volts to make the same power it only takes about 67.6 amps

If you have a truck geared for 40 on 4s and just throw 6s in it heat will increase, put the 6s in and gear it down so it's still at 40 and current draw goes down and so do temps.

Lower kv motors are used on higher voltages so that the RPMs are still in your target range, generally between 30-35000RPM. Also lower kv motors draw less amps at any voltage