Keep losing power

[Taitertot]

So I upgraded my sons razor dirt bike so I have everything hooked up also have the throttle that shows the voltage on it and everything works then about 10 seconds in it stops and you see the voltage on throttle go from 52 to 0 and shuts off then won’t turn back on unless I unplug battery and plug it back in

 

[Chalo]

The battery management system is trying to prevent you from ruining the battery.

What do you mean by "upgrade"? If you increased the motor or controller power beyond what the battery will support, then that's probably the issue. If you got a battery with higher voltage, but unable to supply as much current as the motor and controller demand, then that's probably the issue.

 

[Taitertot]

with a 52v battery could it be from not having the e-lock hooked up correctly

 

[Chalo]

Is the battery rated to deliver 33A? Because if not, cells may sag low enough to trip the minimum cell voltage limit. Or the BMS may have a discharge rate limit.

 

[Taitertot]

It’s a 13s2p battery of model 3 2170 cells

 

[Chalo]

Max discharge for that pack is 19A, if it isn't limited to less than that by its cell connections, power cable, or BMS. You would need two of those packs in parallel to support the motor and controller you installed.

 

[Taitertot]

Could I just get a differnt controller

 

[E-HP]

Could I just get a differnt controller

Your pack can supply 900W, so you can't expect to get 1800W. If you're going with the lower rated controller, then maybe just use the old motor and save some weight.

OR, you can just use less throttle instead of getting another controller.