A home battery can do more than keep the lights on during a power cut. Most owners buy one to use more of their own solar energy or to buy electricity when it is cheaper. Once it is installed, there may be other ways to make it work harder. The right choice depends on your tariff, your equipment and how much control you want to hand over.
Start with the bill, not the app
Look at when your household uses electricity, when solar is available and what you pay for import and receive for export. A battery that saves you money on one tariff may perform differently on another. Include standing charges, export payments and any programme fees when you compare options. Our battery and solar tariff tracker is a starting point, but always confirm the current terms with the supplier.
Use more of your solar at home
With rooftop solar, the straightforward approach is to store daytime surplus and use it in the evening. This can reduce grid imports. It is not automatically the best answer for every unit of energy: an attractive export rate might sometimes be worth more than storing that energy for later. Battery losses and the amount of usable capacity also matter.
Charge when electricity is cheaper
Time-of-use tariffs offer different prices at different times. Many inverters can schedule charging during a cheaper overnight window and discharge during more expensive hours. Set a sensible reserve so the battery has enough energy for your household or backup needs. Avoid assuming every day will follow the same pattern, especially if solar output and household demand change.
Let software adjust the schedule
Automatic optimisation tools can use weather forecasts, expected household demand and tariff prices to decide when to charge, hold, discharge or export. Some suppliers include controls with a tariff; independent software and specialist services can offer other approaches. Check the exact inverter and battery model, connection method, supported tariff, data permissions and what happens if the internet connection fails. See our optimisation overview and compatibility checker.
Owners who enjoy configuring their own system may also consider local tools such as Home Assistant and Predbat. They can be powerful, but setup and ongoing maintenance take time. If you prefer a managed service, ask who controls the battery, how the schedule is explained and whether you can override it.
Consider a flexibility programme
Some programmes reward a group of batteries for adjusting import or export when the electricity system needs help. These are often called virtual power plants or flexibility services. Availability and payments depend on the provider, your hardware and the live programme; a battery is not eligible simply because it can charge and discharge. Read our virtual power plant guide to understand the model.
A sensible order to try things
- Confirm your battery's usable capacity, backup reserve, export arrangement and warranty terms.
- Compare your present bill with a suitable time-of-use tariff using your own usage data.
- Check which optimisation tools or flexibility programmes support your exact system.
- Ask whether the service can work alongside your tariff and solar export arrangement, and how revenue is shared.
- Review the result after a few weeks, including extra battery cycling and any fees.
The aim is a better overall outcome, not the highest-looking headline payment. A good setup should fit the way you use energy and be easy to understand. Explore home trading and optimisation if you want to compare the routes in more detail.
Further reading
Ofgem's overview of flexible products and tariffs and NESO's Demand Flexibility Service explain the wider UK context.