With a smart home battery you keep today's energy for tomorrow morning's coffee. Or you use stored power on cloudy days and in the evening. That way you use more of your own electricity.

If you have solar panels, you often charge the battery with daytime surplus instead of feeding it back. Without panels the battery can also charge during cheap hours. Later you use that stored power for lights, cooking or the TV.

The battery talks to your inverter and fuse box. A smart system charges when it fits and discharges when you use power, with nothing for you to do. During an outage, backup power only keeps critical appliances on if you chose that option.

The less net metering gives you, the more attractive it becomes to keep your own power. A battery pays off most if you use a lot in the evening, have a heat pump or EV charger, or want to be more self-sufficient.

Whether it adds up financially depends on your use, the size of your battery and your energy tariff. We are happy to run the numbers with you at home. More on costs and choosing is in the knowledge base. Since 29 May 2026 a fixed battery from 5 kWh with solar panels can also help toward your energy label; read the conditions in our article on home batteries and the energy label.

Capacity, in kilowatt-hours, says how much power the battery holds. Power, in kilowatts, says how fast it can charge and discharge. A battery that is too small runs empty quickly in the evening. One that is too big never fills. The right size depends on your use; see also choosing a home battery.

With a dynamic energy contract you charge the battery when the electricity price is low, often midday or overnight, and use it when the price spikes during the evening peak. That creates an extra way to save, completely separate from your solar panels.

The power grid is filling up in more and more neighbourhoods, especially during the evening peak. A home battery relieves the grid twice: it absorbs surplus at midday and delivers that power to your home in the evening, exactly when demand peaks. Read more about grid congestion.

Only in designated congestion areas can a grid congestion payment apply, via energy suppliers for batteries that take part during peaks. That is not a nationwide guarantee. We install steerable brands as standard, so your battery can join such a scheme if one is available where you live, now or later.