My first 14s11p battery charging stopped before reaching 58.8V
Guys, I am charging for the first time the 14s11p battery that I built. The charger stopped at 53.7V instead of 58.8V. I am using a Vruzend 52V charger and matching Vruzend BMS. All the batteries are new and of same type. A few were full and the rest at 3.6V when I started charging. What could be the problem? I measured the voltage from the negative charging cable to +1, +2 .. +14 balancing leads connection and the voltage increases for every measurement with the expected amount so I don't think a series group is interrupted. How can I troubleshoot this? Did a hard BMS reset and it resumed charging for a few minutes and then the charger stopped againand the led turned green. Thanks for any suggestion you may have
Thanks Micah for the reply. The voltage of one parallel group was way higher than the others (4.17V) and the others were like 3.7V. I discharged that parallel group to match the others with a battery discharger/tester with low voltage cut-off and the charging resumed.
It stopped again at 57.1V pack voltage still short of 58.8V. The situation is now the following for each parallel group voltages:
- 4.4 V
The question is will the BMS take care of this in a few days by bleeding the higher parallel groups ? The balancing must be triggered since one of the cells at least reached the threshold voltage.
What should I do ? Leave the charger connected ? I don't like the idea to leave the pack unattended or can I force the cells into balance somehow ( bulk charging to less than max voltage to avoid overcharging any parallel cell ?). Need some sort of 60V+ DC power supply, like from a 3D printer + I have a 5A variable DC step down converter.
Thanks again for your answer and for your contributions to DIY battery pack community,