Why Does the Battery Capacity Sometimes Drop Below the Minimum Capacity Setting?

The default minimum capacity is 10% (can be changed to a higher level). During night time (no PV), when the battery is discharged to the minimum capacity, usually it will go into the “Idle mode” or “Standby mode”. However, the whole hybrid system is still consuming power. Therefore, you may see that the battery capacity sometimes goes down to low than 10%. When the battery capacity is down to 5% (protection level), it will trigger a charging demand, which requests charging from grid until it goes back to the normal minimum capacity level, it may happen in the night time or during winter time when there is no enough PV production or during bad weather days. This is a normal behaviour and won’t affect the battery life.