Victron Multiplus II & Hubble AM2 losing charge

If you receive High Voltage alarms that would mean your battery is not set up correctly or it has cell imbalance issues.

So asuming you have set the max battery voltage for what the battery require, you then need to help the battery to get the cells balanced. You do that by what @Sarel.Wagner suggested by lowering the max voltage to a level where you don’t get high voltage alarms anymore and then slowly over a few weeks you can increase the max voltage to where it should be. This will give the balancers time to work.

Balancing works when ever 1 cell go above the threshold, so you are trying to find the battery voltage where that one cell is above the threshold but below the high voltage alarm (e.g. 3.45V - 3.65V) and then giving the balancers time to work down the high cell with the 50mA (or what your BMS can do) load it can do.

This will be much faster to do if you use the Keep Batteries changed in ESS option while you are doing this.