12v DIY 280ah battery help

[rrleesb]

I'm building a 12v 4 cell 280ah battery. I got the cells and BMS from Jenny Wu.

I have it all wired up but the BMS doesn't seem to be operating correctly(or at all). It's a JK-B2A8S20P. I've followed the wiring instructions but I can't connect to bluetooth and it isn't taking/giving current. I have the black wire to battery neg, then sense lead one to the same battery pos, and on down the line with the sense cables on the positive terminals. B- goes to battery neg and P- goes to the output side of the BMS.

It came with a small pushbutton that plugs into the display connector, but having it attached doesn't seem to make a difference and the manual says it does not come with any on/off switch.

I only have the one wire hooked up for testing.

Any ideas where to start?

 

[time2roll]

I see two large black wire connections to the negative and one is correctly BMS B- and the other I cannot see where it goes.

The wire diagram shows two small red wires to the battery positive but the picture I only see one. I suspect the second wire is the power to the BMS electronics.

 

[aliarifat794]

Confirm that the pushbutton is properly connected. If the BMS is supposed to power on with the pushbutton, try holding it down for a few seconds to see if it activates the BMS.

 

[rrleesb]

Solved....wire 9 goes to the positive terminal. Didn't see that in the wiring diagram.

Thanks!

 

[740GLE]

Also you don’t need that button plugged in/working to turn it on. A quality DMM will turn it on in diode testing mode and the leads touched to the P B terminals.