diy solar

diy solar

Daly 100A BMS won't connect

hobbes1069

hobbes1069

New Member
Joined
Jan 5, 2020
Messages
12
So I purchased 4 new 100AH CALB cells and they seem to be working great so far. I hooked them up temporarily to my Daly 100A BMS. Unfortunately the BMS leads were too short to optimally place the BMS in my system so I purchased some 22ga silicone insulated wire to extend the BMS leads.

After crimping on the butt splice connectors to extend the BMS leads it will not "turn on". While the BMS connector harness is too small for me to probe it directly I have slid the probe of my mutl-meter into the back side of the butt splice connectors on the BMS side, which all tests fine (continuity or voltage). If I had a bad crimp it should show up here, but when I connect to the BMS it does not turn on.

I've traced the BMS leads to make sure they are connected to the correct cell terminals multiple times and even when I tested the voltage on the back side of the butt splice connectors the voltage stepped up correctly (approx 3.32V per cell).

I'm completely stumped and frustrated at this point...

Any ideas?
 
hobbes1069 said:
So I purchased 4 new 100AH CALB cells and they seem to be working great so far. I hooked them up temporarily to my Daly 100A BMS. Unfortunately the BMS leads were too short to optimally place the BMS in my system so I purchased some 22ga silicone insulated wire to extend the BMS leads.

After crimping on the butt splice connectors to extend the BMS leads it will not "turn on". While the BMS connector harness is too small for me to probe it directly I have slid the probe of my mutl-meter into the back side of the butt splice connectors on the BMS side, which all tests fine (continuity or voltage). If I had a bad crimp it should show up here, but when I connect to the BMS it does not turn on.

I've traced the BMS leads to make sure they are connected to the correct cell terminals multiple times and even when I tested the voltage on the back side of the butt splice connectors the voltage stepped up correctly (approx 3.32V per cell).

I'm completely stumped and frustrated at this point...

Any ideas?
Click to expand...
I can't imagine the device being so sensitive to impedence, but maybe wire lengths matter and you added too much wire length?
Did you try the BMS with the original wires?
 
KG6S said:
Can you post a picture of your setup? Did you place the blue cable on cell 1 negative? Did you touch the black to the cell one negative?
Click to expand...

Yup... That was the "fix". The instruction that came with the BMS did not mention shorting B- and P- to "wake it up" but some googling I did after I posted here mentioned it. Strange though I didn't have to do that the first time I connected it...

Thanks,
Richard
 
Ok what do you do when the BMS has shut off because it reached min voltage on the battery? I have been disconnecting the bms load, removing the cables from the different cells and hooking back up, Is there an easier way?
 
On a Daly I think you need to get the cell voltage to 2.7V per cell to release the disconnect. In this case you would temporarily bypass the BMS to get the cell voltage high enough. Read up on this though, since I have never done this.
 
As long as you're using a LiFePO4 charger you should be fine as it would never lower the voltage and should not overcharge either.
 
I am using an Outback solar charge controller with the limits set and I don't use the BMS to regulate the charging. ( have been doing this for over 3 years with a tesla battery ) But the BMS did not kick back on even after cell voltage came back to 4.0 I only charge to 4.1 V per cell.
 
I will try to find the specs for my 10s Daly BMS... Will post, did not come with any manual.
 
You must log in or register to reply here.

Similar threads

T
JK BMS Leads - Connecting to Previous Leads? Or complete rewire?
Replies
2
Views
152
Rednecktek
Rednecktek
ohmboy
Overkill solar BMS bluetooth not working
Replies
8
Views
229
ohmboy
ohmboy
O
DALY BMS %$&@
2
Replies
25
Views
858
Offgriding
O
U
Daly BMS CHG/BLNC issues.
Replies
2
Views
185
RGUERI1
R
kolek
How to connect the "black" style JK-BMS with the short B- and P- leads?
2 3
Replies
44
Views
1K
PotusGobbleBottom
PotusGobbleBottom
Back
Top