Potential and Optimal Sizing of Combined Heat and Electrical Storage in Private Households

The increase in fluctuating renewable electricity generation requires growing flexibility and balancing capacities in the electric energy grid. Storage systems can provide the necessary balancing capacities. Therefore, it is analyzed which potential for flexible energy consumption can be found in private households. Heat and power in private households are heavily interlinked due to increasing numbers of electrical heating systems (e.g. heat pumps). In addition, installed PV systems on roof tops are making renewable electricity an attractive energy source for space heating and hot water supply. To maximize the consumption of self-generated electricity, battery energy storage systems (BESS) and thermal hot-water based storage systems are used in private households. The challenge is to find economically viable configurations for sizing of combined battery and thermal storage units.