MurphyGuy
It just needs a bigger hammer
- Joined
- May 20, 2020
- Messages
- 4,129
My 14s (480ah) lithium ion battery bank sits in storage most of the time doing nothing.. I store it isolated from everything.
I have one cell out of the 14 that has a higher self discharge rate then the others. Most of the cells have almost no self-discharge at only 0.001 to 0.002 volts per month, but one cell seems to lose about 0.008 to 0.010 volts per month of inactivity.
Since my battery bank is for grid outages, we can go several months without using the system.. All the other cells are within 5mV.. but my #12 cell was 60mV below the rest of the pack.
I already used a hobby charger to bring it up in line with the rest as the battery bank was isolated.. and monitoring it shows that it is losing about 1mV (0.001) every 3 days. In the past month, it has lost 10mV.
Anyone ever use a little hobby charger to charge a single cell while a system is running? I don't want to force the BMS to bleed off the other 13 cells just to equalize things.. much easier to just add some energy to that one cell..
Wondering if the BMS would even notice if the system was operating.. anyone?
I have one cell out of the 14 that has a higher self discharge rate then the others. Most of the cells have almost no self-discharge at only 0.001 to 0.002 volts per month, but one cell seems to lose about 0.008 to 0.010 volts per month of inactivity.
Since my battery bank is for grid outages, we can go several months without using the system.. All the other cells are within 5mV.. but my #12 cell was 60mV below the rest of the pack.
I already used a hobby charger to bring it up in line with the rest as the battery bank was isolated.. and monitoring it shows that it is losing about 1mV (0.001) every 3 days. In the past month, it has lost 10mV.
Anyone ever use a little hobby charger to charge a single cell while a system is running? I don't want to force the BMS to bleed off the other 13 cells just to equalize things.. much easier to just add some energy to that one cell..
Wondering if the BMS would even notice if the system was operating.. anyone?