Self-consumption and its increase are dependent on the following factors:
The energy consumption of the household, the nominal power of the PV plant, and the battery capacity.
In this example, the following can be clarified:
In a 4-person household with an annual power consumption of 4 900 kWh and a 5 kWp PV plant, natural self-consumption is 30%.
By using a Sunny Backup system, this can be increased to between 45% (6 kWh lead acid battery) and 60% (15 kWh lead acid battery).
If self-consumption rates of more than 80% should be reached, this is only possible with a smaller PV plant that already features a higher natural self-consumption.