A home also has thermal storage.
Depending on the technical possibilities, energy can be stored in a hot water cylinder or a buffer tank, or the building's thermal inertia can be used.
If you will need hot water in the evening, it may be suitable to heat it while the PV system is generating instead of going through the electrical battery. The specific solution depends on the home and the equipment.
Comfort and operating limits are maintained.
The aim is not to overheat the home unnecessarily. Control must respect the required temperatures, the technical limits of the heating and the hygiene conditions for hot water.
Shifting in time is possible only to the extent that suits the household.
Thermal and electrical batteries complement each other.
Hot water does not power lights, the fridge or electronics. A home battery stores electricity for other appliances and, depending on the design, for backup operation.
Good control therefore compares direct use of generation, heat preparation, battery charging and the home's other needs.
Winter heating cannot be assessed on the basis of summer.
In periods of higher heating demand, photovoltaics usually generate less. The same annual generation and consumption therefore do not mean self-sufficiency.
A home battery is for shifting energy over shorter periods, not a standard solution for moving summer surpluses into winter. We assess the consumption profile over the year.
Should the heating also work during an outage?
We check the power of the battery system, the requirements of the heat pump, its start-up and the other backed-up appliances. The presence of a battery alone is not enough for such a promise.