When I accelerate with wheels on ground , instant cut out. I have to plug charger back in to allow me to turn back on.

 

If I accelerate with wheels off ground, motor spin.

 

52v battery fully charged showing 57v.

 

Any help please?

 

Edit: even with wheels off ground it still cuts out instantly when accelerating.

 

Edit2: with charger plugged in wheels spin while off ground.

Edited October 10, 20205 yr by Paulpmpmpm

Sounds like your controller amps is greater than what the battery can give. You have to tell us which controller and which battery you have.

Sounds like your controller amps is greater than what the battery can give. You have to tell us which controller and which battery you have.

 

Thanks, battery is 52v 23.4ah , 1216.8wh battery from China.

 

I have 2 controllers 1 for each 1000w motor. Controllers are JP25Ah 52v dual controllers.

 

I managed to do around 200kmh before facing this problem. I am about to cut open battery and test cells.

Thanks, battery is 52v 23.4ah , 1216.8wh battery from China.

 

I have 2 controllers 1 for each 1000w motor. Controllers are JP25Ah 52v dual controllers.

 

I managed to do around 200kmh before facing this problem. I am about to cut open battery and test cells.

You're taking 50 amps out of that battery! It doesn't sound good if it's a no name unbranded cells one. Please show a link to it. Volts and Ah doesn't mean anything. We need a specification.

Can you try just one motor at a time? this will reduce the demand on the battery

What bms is fitted in the battery and what type make are the cells

You're taking 50 amps out of that battery! It doesn't sound good if it's a no name unbranded cells one. Please show a link to it. Volts and Ah doesn't mean anything. We need a specification.

Hi I have attached pic of battery pack I can't find a link to one online.

 

I just cut it open and there is 7 packs of cells. Each tested between 4.11 and 4.18 volts.

 

Edit: each individual battery has this writing on : SINC ISR 1865026 A19829537

Edited October 10, 20205 yr by Paulpmpmpm

Can you try just one motor at a time? this will reduce the demand on the battery

What bms is fitted in the battery and what type make are the cells

Hi I have attached pic of battery pack I can't find a link to one online.

 

I just cut it open and there is 7 packs of cells. Each tested between 4.11 and 4.18 volts.

 

I tried with one Motor and got the same result.

If the sticker is correct it should be 9 cells in parallel and 14 in series total 126 cells

Only 7 cells will lower the total capacity and only 98 cells can you show a pic of the battery pcb

suspect the battery or the bms is cooked, can you do a voltage check under load

If the sticker is correct it should be 9 cells in parallel and 14 in series total 126 cells

Only 7 cells will lower the total capacity and only 98 cells can you show a pic of the battery pcb

suspect the battery or the bms is cooked, can you do a voltage check under load

Hi mate there seems to be 18 cells in parallel total 126 cells. I have attached a pic.

 

When I accelerate under load it drops to 0 volts. Even when not under load it cuts out also. It only doesn't cut out if I have charger plugged in.

 

I hope this info helps and pictures, sorry if I'm not helping very well I will try supply as much info as I can .

The volts drop to zero ? then the bms cannot cope with the load and is cutting out/or overloaded and has damaged or another possibility is a joint/ weld is going open circuit in the pack

To much current required for battery battery pack to supply one 1000w motor would stress it two have probably killed it ,others on here might be able to suggest a way around it but suspect its a battery rebuild or replacement

The volts drop to zero ? then the bms cannot cope with the load and is cutting out/or overloaded and has damaged or another possibility is a joint/ weld is going open circuit in the pack

To much current required for battery battery pack to supply one 1000w motor would stress it two have probably killed it ,others on here might be able to suggest a way around it but suspect its a battery rebuild or replacement

 

Okay mate thanks so probably the BMS needs replacing then.

 

It's actually a scooter not a bike, it has front and back motor 1000w each. It was sold like this from factory IV only done 200km I thought it would be able to handle it.

Its a 9s14P battery, so you've only measured half of the cells. we need a listing to comment further. Can you disconnect one controller and try it with just one motor to see if it's too much current that's causing the cut-outs?

Thats a different proposition to a bike motor, never seen a 1000w motor in a tiny wheel let alone 2 motors

Did the motors ever get hot, is it two controllers on one throttle, any water damage to the battery pack

are the wires damaged as they go into the wheel s

Its a 9s14P battery, so you've only measured half of the cells. we need a listing to comment further. Can you disconnect one controller and try it with just one motor to see if it's too much current that's causing the cut-outs?

 

Sorry I'm new to this it looks like there 7 sets of 18 battery's? I have checked the voltages on the BMS and they are all 4.1.

 

Yes I will try again tomorrow and reply back, thank you.

Thats a different proposition to a bike motor, never seen a 1000w motor in a tiny wheel let alone 2 motors

 

This is my scooter https://www.ebay.co.uk/itm/324289020792

Did the motors ever get hot, is it two controllers on one throttle, any water damage to the battery pack

are the wires damaged as they go into the wheel s

 

Yes motors have got hot before.

 

Yes 2 controllers one throttle.

 

I have ridden scooter In the rain but not sure of water damage. I did try to seal off everything with sealant.

 

I'll have a look tomorrow when I go into garage but they could be. You think it could be motors ?

Sorry I'm new to this it looks like there 7 sets of 18 battery's? I have checked the voltages on the BMS and they are all 4.1.

 

Yes I will try again tomorrow and reply back, thank you.

Each 3.7v cell group has 9 batteries in parallel. 14 of those make 51.8 volts

 

Fully charged, each cell group would be 4.2v. a4 x 4.2 = 58.8v. Your 57v is a bit low.

Thats a mega fast charger 3 to 5 hours. Wow it must be like a rocket 70 kph every thing must be pushed to the limit

might get very hot controller s and even cook the battery

Thats a mega fast charger 3 to 5 hours. Wow it must be like a rocket 70 kph every thing must be pushed to the limit

might get very hot controller s and even cook the battery

 

I have actually already replaced one of the controllers.

 

I think the battery is okay. I have tested using this method

and they all came back as 4.1v. Does this mean BMS and battery okay?

 

Maybe controllers ar broken.

Each 3.7v cell group has 9 batteries in parallel. 14 of those make 51.8 volts

 

Fully charged, each cell group would be 4.2v. a4 x 4.2 = 58.8v. Your 57v is a bit low.

I see I just be looking at it all wrong cause I can only see 7 groups of 18 batteries.e

When first looked i thought the pack was not looking right but as it had worked it must of been ok, is it a joint bad weld on the tin strips

But how you can power 2000watts fully enclosed it must be a cross between a toaster or a microwave the heat must be extreme can you try just one controller and motor at a time

I see I just be looking at it all wrong cause I can only see 7 groups of 18 batteries.e

If you look, there are 18 cells all welded together, but 9 are one way up and 9 the other. Underneath, you will see that there is a divide between each group of 9 and each 9 are welded to another 9 next to them, so still 18 welded together but not the same 18 on the top. On one side at the ends, there will be a group of 9 on their own.

When first looked i thought the pack was not looking right but as it had worked it must of been ok, is it a joint bad weld on the tin strips

But how you can power 2000watts fully enclosed it must be a cross between a toaster or a microwave the heat must be extreme can you try just one controller and motor at a time

 

I have no idea mate as know hardly anything about electrics but there is a few scooters on the market with specs like mine.

 

I can try tomorrow. Main controller must be plugged in second controller is plugged into main controller.

If you look, there are 18 cells all welded together, but 9 are one way up and 9 the other. Underneath, you will see that there is a divide between each group of 9 and each 9 are welded to another 9 next to them, so still 18 welded together but not the same 18 on the top. On one side at the ends, there will be a group of 9 on their own.

AHH I see thanks mate I see now