Originally Posted by
fievel
So let me get this straight in my head. It seems that esc temps are more dependent on the motor than on the batteries? If we lower the Kv of the motor we must increase the voltage of the pack in order to get a competitive speed. So if I were to switch from a 1900Kv motor to a 1700Kv motor and still use 4s I would be sacrificing speed but my esc would run at a lower temp. am i understanding this correctly? I am sorry if this has been covered many times before but I'll be willing to bet I am not the only one slightly confused by all of this.
Amps are what create the heat in the ESC. When we use higher voltage, the less amps are needed to create the needed power, so the ESC runs cooler. The same is also true of the batteries. The higher voltage setups are easier on the batteries which is why you can get away with running lower C rated packs because the battery doesn't have to work as hard to supply the needed amps (which is why higher voltage setups use packs with less overall Mah for the same run time).
In my experience, I haven't noticed a significant differnet motor temps regardless of the setups and I have raced everything from 3s to 6s. What creates temps more than anything is ensuring the motors have enough torque. This is why the four pole motors such as Neu, Castle, Tekin, adn Xerun run cooler than the two pole motors from Novak, LRP, etc.