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JDB AP21S002 smart BMS solid state switch will not stay on

ArthurFlyDiver

New Member
Joined
Dec 15, 2023
Messages
9
Location
Paris, TX
1. All balance wires measured and balanced to within .07v
2. No connection from L-ion 14S battery pack to solar charger or inverter.
3. When balance wires first connect to BMS the BMS blue led showed a steady light after boot process.
A. Then the noise maker began beeping at ~1 sec. intervals.
B. Off/On switch did nothing nor did the volt meter connected to the On/Off switch display.
4. Connected 52.4v charger to battery input (B+ and gnd)
A. BMS powered up, the solid state switch connected and within 1 second disconnected.
B. Voltmeter displayed B+ and the On/Off switch showed a light but did not change anything when switched.
5. Replaced the 52.4 charger with an EG4 solar charger.
A. EG4 displayed PV voltage but no current.
B. Battery pack did not display voltage nor did the On/Off show its light or do anything else.
C. BMS began the 1 second interval beep.

All suggestions gratefully accepted, even if accompanied by flames.
 
Can you share a photo?

Did you meter out the connector to make sure voltage stepped up properly?

You have the correct wires jumpered together for the number of cells you are running?

Have you connected with Bluetooth to see data?
 
Can you share a photo?

Did you meter out the connector to make sure voltage stepped up properly?

You have the correct wires jumpered together for the number of cells you are running?

Have you connected with Bluetooth to see data?
All balance wires were measured and recorded to ensure correct voltage stepping. I also made certain to balance the cell rows to ensure they were within a 1v limit. Wires that have no cell row to connect to are wrired together per the JBD manual. Bluetooth is operational but not show any value for any of the wires other than B+. I got a no permission warning but I think it was for changing values. There is a factory user ID and password. I tried a password of 123456 and it worked sort of but I don't remember the factory ID and have not been able to find it yet.
 

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Wires that have no cell row to connect to are wrired together per the JBD manual.
And they are all going to one cell, correct?
Bluetooth is operational but not show any value for any of the wires other than B+.
Can you post a screenshot?
Are you using the Xiao app?

I haven't had to enter a user id or password on all 4 of mine.

I'm wondering if it's a LiFePO4 vs Lithium ion version issue.
 
And they are all going to one cell, correct?

Can you post a screenshot?
Are you using the Xiao app?

I haven't had to enter a user id or password on all 4 of mine.

I'm wondering if it's a LiFePO4 vs Lithium ion version issue.
The circuit board conncetions for BC12-BC19 are wired together and goto BC12 + side of the battery BC13 is connect to the BC 19 + battery connector and BC 14 to the + side of Battery row 14. B+ on the circuit board, the last of the 9 pin connector contacts is also connected to the + side of the 14th row. Hope that makes sense.
Will get you a screen shot of the JiaaJiang app in the morning. Only the total v, high and low v and temperatures have values. No % of charge gauge and no balance wire readings useing the guest login. I am fairly certain that is because the solid state switch is not conneting C- and B-. Given that the switch is rated for 300 amps I am a bit reluctant to bypass it. I am thinging that if there is no or only a small load on the battery pack It might not be a problem. Something I was reading mentioned using a 9v battery to kick start the BMS but no details on how to do it.
 
I've never heard of that app. Can you try the Xiaoxang app in the link above?

You've connected a charger between the BMS and battery +, correct?

The wiring does sound correct.
2_1a7c0448-d85c-4ba2-8a36-96b277e33961_1080x.png
 
And they are all going to one cell, correct?

Can you post a screenshot?
Are you using the Xiao app?

I haven't had to enter a user id or password on all 4 of mine.

I'm wondering if it's a LiFePO4 vs Lithium ion version issue.
I fixed the password issue and when I logged in got different results.
1. All but the first 3 balance wires now display cell values that are appoximately the same as I measured on the connector with a Fluke meter.
A. Balance wire 1 shows nearly 0v on bluetooth but measures 4.04v with the Fluke. Wires 2&3 are showing similar readings but in the 3v range with bluetooth; 4.0n on the meter.
B. I am guessing that the bluetoothreadings are not taken from the same place.
C. My first guess is that there are defective FETs on wires 1,2,3 but without a schematic and surface mount soldering equip. replacing the BMS might be my only choice. I have sent Jaibaida two Emails requesting support but no answer in 2 weeks.
2. I was able to turn on charge and discharge switches in the app and ensure that auto balance was on. Temps are in low 70s, i.e. room temp. but unable to clear the error or get the solid state switch to turn on.
 
I've never heard of that app. Can you try the Xiaoxang app in the link above?

You've connected a charger between the BMS and battery +, correct?

The wiring does sound correct.
2_1a7c0448-d85c-4ba2-8a36-96b277e33961_1080x.png
Sorry, correct spelling is XiaoXiang. It is the official Jaibaida app. Has the elephant logo on its icon.
Yes to external charger Puts out a continuous 52v and allows battery resistance to control current flow. FWIIW my solar charger won't start until it sees a load.
 

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