It may occur that the SoC jumps from one value to another, for example from 80% to 76%. Of course, you would expect that the SoC only increases or decreases in steps of 1%.

Sometimes, the SoC drifts from the real SoC, for example because the cell has self discharge or because the BMS’s measured current is a little off. When the “Use measured capacity for SoC” setting is enabled and the battery is in rest, in other words, a low charge or discharge current, the BMS will lookup the cell voltages in an internal table. After taking various compensations into account, the BMS will check if the expected SoC matches the SoC. If not, the BMS will change the SoC. This results in the SoC jumping to a different value.

If you are sure that the SoC jumps are incorrect, please follow the troubleshooting steps.