For non-freewheeling motors only:
If you coasting downhill with an speed greater than the no-load top-speed, the motor becomes an generator which will generate an voltage greater than the battery voltage.
Good point :
1) Charging your battery for free.
Bad points:
1) Overcharging and damaging your battery.
2) If you isolate (mechanically switch OFF) the battery, the motor will generate a higher voltage which will damage your controller because it is still connected to the controller.
3) If you try to isolate (mechanically switch OFF) the motor windings from the controller during running or coasting, an very high voltage spike will occur (due to motor inductance) and will surely damage the controller.
If you coasting downhill with an speed greater than the no-load top-speed, the motor becomes an generator which will generate an voltage greater than the battery voltage.
Good point :
1) Charging your battery for free.
Bad points:
1) Overcharging and damaging your battery.
2) If you isolate (mechanically switch OFF) the battery, the motor will generate a higher voltage which will damage your controller because it is still connected to the controller.
3) If you try to isolate (mechanically switch OFF) the motor windings from the controller during running or coasting, an very high voltage spike will occur (due to motor inductance) and will surely damage the controller.