The degree of self-sufficiency
The degree of self-sufficiency shows to what extent a household can supply itself with electricity from its own solar power system. A degree of self-sufficiency of 100% would therefore mean that a household could completely disconnect itself from the grid operator in order to supply itself with electricity. The degree of self-sufficiency is calculated as follows:
Degree of self-sufficiency [%] = self-consumed solar power / total power consumption.
With a photovoltaic system with an installed capacity of 5 kWp to 20 kWp and an annual consumption of 4,000 kWh, a degree of self-sufficiency of 50% to 60% can be achieved. If a storage system is integrated, the degree of self-sufficiency increases to 75% to almost 100% with usable storage sizes from 3 kWh and with identical solar power and identical annual electricity consumption.