Private photovoltaic system with Fronius Symo Hybrid and BYD Battery-Box Premium

Using the battery to significantly increase self-consumption

Before the battery was installed, the owners achieved a self-consumption rate of approx. 30 %. It was possible to double this value with the storage system. Today, the family uses 60 % of the solar energy they produce themselves for their own devices, such as household appliances, lighting and the heat pump.  

But it is not only the rate of self-consumption that has improved significantly with the battery; the degree of self-sufficiency has also risen from around 50 % to over 70 % (in summer), meaning that the family is already close to being independent of the public grid from May to September.  

Operating the heat pump with PV power

The largest load in the Stutz household is the heat pump, which is also operated with solar power. The combination of heat pump and photovoltaics with a storage system is ideal: the storage of excess electricity and its use for operating the heat pump maximises the rate of self-consumption. Furthermore, Oliver Stutz saves energy costs because he does not have to purchase the electricity for the heat pump. A secondary Smart Meter could be integrated in order to precisely analyse the load curves of the heat pump.