If the electrical energy produced by the photovoltaic system is not consumed directly in the house, this energy is also available as PV excess. The algorithm of the optimization feature “PV excess to heat” increases the self-consumption of the self-produced electrical energy by shifting the operating times of the heat pump to times with a predicted PV excess.
Without optimization
In the scenario presented in graph 1, the heat pump starts operating in the evening when no direct PV excess can be used and no stored energy in the battery (power storage system) is not sufficient.
With optimization
In graph 2, the algorithm of the optimization feature “PV excess to heat” prevents the situation shown in graph 1 by shifting the operating times of the heat pump based on the consumption data of the last 72 hours, the expected PV electricity production as well as historical weather data and the weather forecast. The “PV excess to heat” and “Forecast based battery charging” features work closely together and can be active together or independently of each other.
In general, self-consuming the PV excess produced by photovoltaic systems is more financially beneficial than feeding it into the public grid.