Thanks Aqwut;
I don't know what the fuzz is at this moment; slowing down a vehicle gives you energy; charging the cells above 4.2V per cell? what did you discovered? a 120 percent efficient setup? The peaks MIGHT be higher (not saying they are) but the lipo won't bother too much from little spikes.
@aragon; 'it's easier to lock the wheels than to spin them' what do you want to do with the heat that is produced by that? stuff it in your esc? no sir, you store it in your batteries again; use the low internal resistance of the batteries for braking.
Quote:
|
the braking force should be higher if your battery is flat.
|
Why? does the internal resistance change when the battery is flat? the brakes are using the batteries internal resistance, not their capacity.
Quote:
|
Also, what stops the brakes from causing a spike that takes your lipo above 4.2V/cell?
|
Physics. A lipo can take more than 4.2V in spikes bytheway. It's too slow, and the internal resistance is too low to be 5V immidiately when 5V is applied for 1/100th seccond.
It's plain simple, it works like that period.
In less words;
Motorbraking means more stress on the setup (motor/controller) > more heat for the motor and the controller (and even the batts). a mechanical brake will heat up too, but that heat is okay since it's in a thin metal plate that absorbs quite some energy before it melts down.
That's why i posted;
'If you tell us the setup you want to use, we can tell you if it's wise to use a mechanical brake or not.'
If a battery can be discharged at 20C for peaks, why can't it be charged at peaks of 20C? Braking delivers less energy than it's taking on acceleration, don't know what ratio it is put in, but i think it would be less than 60 percent difference