MWeiss
New Member
- Joined
- Apr 22, 2020
- Messages
- 73
I've had my battery bank running three 16S 280Ah groups of cells with three JK BMS running in parallel to a common set of buss bars for about 6 weeks now with no issues once I ran the batteries through a full discharge cycle. It was always accurate after that.. until this morning. The batteries got down to 20% overnight and sometime this morning, the second BMS reset it's "full" state to 100% when the battery was really below 50% charge.
Since everything is paralleled, the load never causes more than 2-3% difference between battery banks.
Is it common to have a BMS lose calibration like this? Note the Ave Cell Volt readings. I've turned off charging on the 99% one at the time of this capture until I figured out it wasn't REALLY 99%.
The only event that I suspect may have caused the glitch was that charge current went over 100A for a short bit as we had some diffracting clouds boost my solar arrays output by 130% of normal for a few minutes and the BMS hit the charge current limit and shut down charging until I set the charge current to a higher value. Possibly that condition caused a glitch, but would like to know if others have encountered this loss of calibration on this BMS before. These are 200A BMS units.
Since everything is paralleled, the load never causes more than 2-3% difference between battery banks.
Is it common to have a BMS lose calibration like this? Note the Ave Cell Volt readings. I've turned off charging on the 99% one at the time of this capture until I figured out it wasn't REALLY 99%.
The only event that I suspect may have caused the glitch was that charge current went over 100A for a short bit as we had some diffracting clouds boost my solar arrays output by 130% of normal for a few minutes and the BMS hit the charge current limit and shut down charging until I set the charge current to a higher value. Possibly that condition caused a glitch, but would like to know if others have encountered this loss of calibration on this BMS before. These are 200A BMS units.