Honest guides to plug-in batteries for UK homes

Free tool

Would a battery actually save you money?

Fill in your numbers for a first rough answer. A battery earns by charging when power is cheap and covering your use when power is pricey — this shows what that could be worth per year, and how long payback might take. It is an estimate, not a quote.

Change the numbers and press the button.

You'll see a rough yearly saving and a simple payback time.

What this leaves out

Standing charges, battery wear, maintenance, finance costs, tax, installation and future price changes are all ignored here — so treat the answer as optimistic. For a real decision, use your smart-meter history and your tariff's current terms. See the no-solar guide for which assumptions matter most.