JBD bms hook up wrong

Hamburger33 · Jul 3, 2022

I got a jobs bms in 16s. I miss connected the 19th wire to the 20th wire. It was supposed to be connected to the 15th cell. Now I see my error and connect it right. It does not work.

Is there a reset for the bms? Or is it cooked?

Please advise

justgary · Jul 3, 2022

The best way to hook up your BMS is to unplug the sense wire connector from the BMS, then connect all of the leads, then verify with a meter that you did it correctly, then plug the connector in. Try that, and it will probably come to life for you.

HRTKD · Jul 4, 2022

On my 4s JBD BMS I disconnected the sense wire connector from the BMS and that allowed the BMS to reset.

Hamburger33 · Jul 4, 2022

justgary said:
The best way to hook up your BMS is to unplug the sense wire connector from the BMS, then connect all of the leads, then verify with a meter that you did it correctly, then plug the connector in. Try that, and it will probably come to life for you.

i disconnected all the wires. it did not reset. i have all connected right now. it will not work. i am getting 52 v at the battery but after going through the bms i am getting 7 volts.

Hamburger33 · Jul 4, 2022

HRTKD said:
On my 4s JBD BMS I disconnected the sense wire connector from the BMS and that allowed the BMS to reset.

which wire is the sense wire?

Tim Tim · Jul 4, 2022

Hamburger33 said:
which wire is the sense wire?

The sensor wires are the small wires that you connect to each cell. Do you have photos of your setup?
To disconnect them just unplug the connector.

squowse · Jul 5, 2022

Hamburger33 said:
i disconnected all the wires. it did not reset. i have all connected right now. it will not work. i am getting 52 v at the battery but after going through the bms i am getting 7 volts.

maybe you've still got the wires connected wrong? it is very confusing and there are multiple arrangements. What model number is your BMS?

Hamburger33 · Jul 7, 2022

squowse said:
maybe you've still got the wires connected wrong? it is very confusing and there are multiple arrangements. What model number is your BMS?

It's a s20-s4

Hamburger33 · Jul 7, 2022

All the wires are right now. I had 2 crossed. But it's right now

HRTKD · Jul 7, 2022

Did you jumper the unused balance leads on the circuit board? I don't have a BMS that has a variable number of cells that it can monitor. Mine is a fixed number so I didn't have to do that.

Hamburger33 · Jul 7, 2022

HRTKD said:
Did you jumper the unused balance leads on the circuit board? I don't have a BMS that has a variable number of cells that it can monitor. Mine is a fixed number so I didn't have to do that.

if i read it right this bms can supply 4s, and all combinations up to a total of 20s

squowse · Jul 8, 2022

Hamburger33 said:
It's a s20-s4

that's not the model number

squowse · Jul 8, 2022

Is it this one

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HRTKD · Jul 8, 2022

Hamburger33 said:
if i read it right this bms can supply 4s, and all combinations up to a total of 20s

If that's the case then you have to do something about the unconnected balance circuits. You can't leave them unconnected. That's al I know about it.

JBD bms hook up wrong

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