LifePO4 16s 48v Daly Smart BMS won’t turn on…

[rwjeske]

I have a LifePO4 48v battery pack registering at 52v. I have a Daly smart BMS 300A and the b- is hooked to my negative battery terminal and the p- is hooked up to the load which is a Growatt Inverter. The positive is run in from the inverter as well.

When I measure my voltage between the + and b- I get 52v but when I measure between + and p- I get 0. Clearly the Daly isn’t turning on or something but I am completely unsure of where to go from here. I’ve read the manual and tried charging the system to turn it on, Will mentioned shorting the b- and p- which didn’t do it either.

Anyone have any other ideas? Do I maybe have a bad BMS?

 

[MisterSandals]

Anyone have any other ideas?

Have you checked the voltage on your balance wires? If wired incorrectly, BMS will disconnect as it looks now.

 

[rwjeske]

Yes I have, but I will again. I’ve been messing with this thing for like a week. I just don’t get it.

 

[Rustic]

Do you have the low temperature sensor plugged in? BMS won’t turn on without it.

 

[MisterSandals]

Yes I have, but I will again. I’ve been messing with this thing for like a week. I just don’t get it.

That's the problem with the non-bluetooth BMSs, they are very hard to diagnose.

 

[rwjeske]

Do you have the low temperature sensor plugged in? BMS won’t turn on without it.

I do have that plugged in.

 

[rwjeske]

That's the problem with the non-bluetooth BMSs, they are very hard to diagnose.

this one is a bluetooth model. It has a cable to hook up to your computer via USB or you can plug the bluetooth unit in and use the app.

 

[MisterSandals]

this one is a bluetooth model. It has a cable to hook up to your computer via USB or you can plug the bluetooth unit in and use the app.

So its working now? If not, have any screenshots?

 

[740GLE]

Do these need to be “jump started” with an external voltage to wake up the BMS?

 

[rwjeske]

So its working now? If not, have any screenshots?

No it's not working, I can't get anything to connect via bluetooth. It's like there's just no power. I did try jumping it like some guys recommended but still nothing. I'm about to run it over with my truck ... witts end over here.

 

[MisterSandals]

It's like there's just no power.

These are powered by the balance wires. So if you have good voltages between the pins, its probably bad or failed unit.

Pin 1 is negative (to negative of cell1)
Pin 2 is positive to positive of cell 1.
Should have 3.2V between these pins.

Pin1 to pin 3 ~6.4V
Pin 1 to pin 4 ~9.6V
... increasing to pin 17 which should be battery voltage.

Any disruptions in increased voltage from pin ti pin (cell to cell) will cause it to disconnect. Not sure which pin powers BMS.

Happen to have a pic that shows your battery wiring? Just grasping but we've solved many many similar problems with pics of battery wiring...

 

[Tatton]

I have the same one. Have you figured it out?