Jakeroberts100
New Member
- Joined
- Aug 24, 2020
- Messages
- 3
Hey lithium lads and lassies
In retrospect I may have made a questionable decision and bought a LiFePo4 battery from a private seller. Everything felt right about it but now revealing several reasons why this was not the wisest decision for someone with my experience level.
now the issue...
I got 4 series 280ah prismatic cells 12 volt battery. Look to be grade A or new. 200amp Daly BMS since I have a 2000watt inverter. When I got them I measured them all at the same voltage (3.6 I think). Put my whole electric setup together for my van (4x100w solar with renogy cc is my only charging setup ) and everything seemed to be running smoothly. Copied most of the components and wiring from Wills 400watt setup. A small issue where voltage would sometimes drop to 5v but I think I solved that was a loose connection in my fan.
Somehow after less than a week I ended up with the cell closest to the BMS reading 2.82v. The others at 3.21v. I was never pulling more than 10amps. The BMS shut the circuit I’m guessing due to the low cell voltage but I thought it had active balancing to prevent this unbalance from happening. Weirdly I still get 1.28 volts from the positive terminal to the BMS output.
does this sound like the cells need to be top balanced. Or could the cell be bad ?
one of my reasonings for buying from this seller was I didn’t really want to mess with that/buy the tools to do it. I think I could figure it out, but was also wondering if there is anyone in the Atlanta area who wanted to make some extra cash helping me out? Hope this is allowed here and in the right section.
In retrospect I may have made a questionable decision and bought a LiFePo4 battery from a private seller. Everything felt right about it but now revealing several reasons why this was not the wisest decision for someone with my experience level.
now the issue...
I got 4 series 280ah prismatic cells 12 volt battery. Look to be grade A or new. 200amp Daly BMS since I have a 2000watt inverter. When I got them I measured them all at the same voltage (3.6 I think). Put my whole electric setup together for my van (4x100w solar with renogy cc is my only charging setup ) and everything seemed to be running smoothly. Copied most of the components and wiring from Wills 400watt setup. A small issue where voltage would sometimes drop to 5v but I think I solved that was a loose connection in my fan.
Somehow after less than a week I ended up with the cell closest to the BMS reading 2.82v. The others at 3.21v. I was never pulling more than 10amps. The BMS shut the circuit I’m guessing due to the low cell voltage but I thought it had active balancing to prevent this unbalance from happening. Weirdly I still get 1.28 volts from the positive terminal to the BMS output.
does this sound like the cells need to be top balanced. Or could the cell be bad ?
one of my reasonings for buying from this seller was I didn’t really want to mess with that/buy the tools to do it. I think I could figure it out, but was also wondering if there is anyone in the Atlanta area who wanted to make some extra cash helping me out? Hope this is allowed here and in the right section.