Electric Scooter - Fully Charged but wouldn't move

[skeelo]

Hello everyone first time posting here, I have a Davinci Cruiser.
500 watt rear wheel hub style,
M1 smart battery-sealed lead acid deep cycle 48 volt 5x 12v 20ah.
Generation 5 controller.

It's running fine, however today as I was driving to work all of a sudden the ebike wouldn't move when I turned the throttle, it showed it had full power, so I pulled over and stopped for a minute, turned it off and turned it on and then it started working again.

Seems to working fine still, but why would this happen?

Is there something I should check?

 

[Skedgy Sky]

Does battery have a BMS?

Could also be a loose wire somewhere. Have a volt meter with you next time it happens and check conductivity and voltage.

 

[granolaboy]

I've had throttle cables get loose and behave like that. I'd wiggle the throttle wire on your controller and see if it makes your throttle cut in and out.

 

[skeelo]

ah thanks! it was a loose wire! got it on good now.

 

[skeelo]

Just an update 11 months later!

Getting the same problem, the past few weeks occasionally the scooter would just give out and stop running while I was driving it, a simple turn off/on and it would go again.

Then last week, the day before it wouldn't go again, the scooter was running pretty slow on a full battery charge for like 10 minutes, could be the motor giving way so the controller was getting overworked, so could be either the controller, motor or maybe even the battery.

I inspected the wiring and everything seems to be well connected, I smelled the controller and motor and there's no burnt smell.

Any ideals on how to test to see what's wrong?

 

[Laserman]

Get the volt meter out and test all connection from pack to controller then disconnect pack from controller then use ohm meter to check wires from controller to motor

 

[agniusm]

Does battery have a BMS?

Could also be a loose wire somewhere. Have a volt meter with you next time it happens and check conductivity and voltage.

lead acid and bms does not go in one sentence
I think the battery is caput. when it sags controllers lvc kicks in.

 

[skeelo]

thanks, I just brought it into the ebike shop, will find out soon what it is, I think its the motor, as I can't even roll the scooter backwards anymore the rear tire/motor locks up moving backwards.

*update*

got it back, it was the wiring harness attached to controller got shorted out, they said wires probably loosened over the year I owned it, eventually when that happens the wires can overheat and short out eventually.

In addition man a little thing like pumping up the tubeless tires they did makes a huge difference as well! helluva lot more nimble and faster.

Now all I want to do is paint the yellow into a matte black.

 

[granolaboy]

I can't even roll the scooter backwards anymore the rear tire/motor locks up moving backwards.

Motor won't turn usually means your phase wires are shorted.

it was the wiring harness attached to controller got shorted out

Yep...

 

[skeelo]

I can't even roll the scooter backwards anymore the rear tire/motor locks up moving backwards.

Motor won't turn usually means your phase wires are shorted.

it was the wiring harness attached to controller got shorted out

Yep...

mannnnn, wish I posted that long ago, ah well, loving this scooter again, just a slight downhill, very slight got almost 60 km per hour, flying!

 

[4LivesPerGallon]

The OP said 48V, but 5x12V lead acid.

So, this is a 60V system mod, that's why the 60kph top speed.

Probably why wires are shorted - they are acting like fuses.