boarder2k7
New Member
- Joined
- May 29, 2022
- Messages
- 59
I was looking at Facebook Marketplace earlier today and came across someone selling a PAIR of server rack batteries in unknown condition for $400. Figured at that price I couldn't lose, so I hopped in the car and snagged them. Cases are pretty beat up looking with bent rack ears and some dents, and the display on one is smashed. No big deal at that price.
Got them home and put 48v on the one with the good display to wake it up. Scrolled through the menu and found the BMS in "protect" mode, one of the cells was reading double voltage, and the next door cell 0v. Popped the cover off and found a broken balance wire and a couple loose screws on the balance leads, quick soldering job and some tightening and the BMS came out of protect mode.
Now the interesting question is that the pack is showing 49V, but a 0% SOC. I grabbed the only load tester I had and was able to pull 3.5 amps from the pack (maxing out the tiny load tester) and it seems to behave normally.
It's reading the following, so a little weird.
SOC: 0%
SOH: 100%
RM: 0.00 Ah
CC: 100.00 Ah
More pictures can be found here:
I haven't started looking in to the one with the smashed display yet, I'd appreciate any help identifying these so I could source replacement parts and figure out the weird BMS readings where it thinks it is at a 0% SOC while being at a voltage that would make me expect 70% SOC.
Thanks for any help
Got them home and put 48v on the one with the good display to wake it up. Scrolled through the menu and found the BMS in "protect" mode, one of the cells was reading double voltage, and the next door cell 0v. Popped the cover off and found a broken balance wire and a couple loose screws on the balance leads, quick soldering job and some tightening and the BMS came out of protect mode.
Now the interesting question is that the pack is showing 49V, but a 0% SOC. I grabbed the only load tester I had and was able to pull 3.5 amps from the pack (maxing out the tiny load tester) and it seems to behave normally.
It's reading the following, so a little weird.
SOC: 0%
SOH: 100%
RM: 0.00 Ah
CC: 100.00 Ah
More pictures can be found here:
I haven't started looking in to the one with the smashed display yet, I'd appreciate any help identifying these so I could source replacement parts and figure out the weird BMS readings where it thinks it is at a 0% SOC while being at a voltage that would make me expect 70% SOC.
Thanks for any help