Hi folks, so I got this cheap chinese "Enduro" frame ebike.
The problem is it's cutting out under heavy load, but only after couple of minutes of riding.
Typically it happens like this:
- I head out into a steep hill
- first 300m is fine, pulls hard
- then it stops going (but the display is still on and battery voltage is not low and still showing)
- I have to realease the throttle for 2s and then apply again, and it goes for another few seconds before cutting out again
- once I get to a less steep part or a flat, it goes just fine
I don't think it's the battery, because I have a voltmeter connected directly to it, and lowest it dropped was 45V - never to zero which would suggest the BMS cutting out. Also the low voltage cutoff on the controller itself is supposed to be 40V.
Also I tested this battery on another bike and ran it pretty low without any cutting out occuring.
I thought it could be heat protection kicking in - but - after it happens, the controller, motor and cables are barely warm to the touch (I'd guess right around body temperature). I'm not sure typical ebike controllers even have a heat sensor inside?
What would you suggest I try or look for?
The componets my bike has:
- "Enduro" chinese frame
- noname chinese hubmotor with 45mm stator, 26" rim
- noname controller, designated KT48ZWSRKD-RQ14L, rated voltage 48V, says 30A continuous, 60A peak, LVC 40+-1V. The controller is pretty long, but thin. I'm guessing it's 16-20 mosfets? Physically it feels pretty small for big bike like this and the pwer and phase wires feel a bit on the thin side as well. But what do I know. It doesn't get hot.
- battery is Li-ion 48V / 30AH / 1440Wh (it's pretty big, I'm sure it can handle measly 60A)
The problem is it's cutting out under heavy load, but only after couple of minutes of riding.
Typically it happens like this:
- I head out into a steep hill
- first 300m is fine, pulls hard
- then it stops going (but the display is still on and battery voltage is not low and still showing)
- I have to realease the throttle for 2s and then apply again, and it goes for another few seconds before cutting out again
- once I get to a less steep part or a flat, it goes just fine
I don't think it's the battery, because I have a voltmeter connected directly to it, and lowest it dropped was 45V - never to zero which would suggest the BMS cutting out. Also the low voltage cutoff on the controller itself is supposed to be 40V.
Also I tested this battery on another bike and ran it pretty low without any cutting out occuring.
I thought it could be heat protection kicking in - but - after it happens, the controller, motor and cables are barely warm to the touch (I'd guess right around body temperature). I'm not sure typical ebike controllers even have a heat sensor inside?
What would you suggest I try or look for?
The componets my bike has:
- "Enduro" chinese frame
- noname chinese hubmotor with 45mm stator, 26" rim
- noname controller, designated KT48ZWSRKD-RQ14L, rated voltage 48V, says 30A continuous, 60A peak, LVC 40+-1V. The controller is pretty long, but thin. I'm guessing it's 16-20 mosfets? Physically it feels pretty small for big bike like this and the pwer and phase wires feel a bit on the thin side as well. But what do I know. It doesn't get hot.
- battery is Li-ion 48V / 30AH / 1440Wh (it's pretty big, I'm sure it can handle measly 60A)