BatterySizer analyses your actual energy usage, compares tariffs, and tells you exactly what size home battery storage system will save you the most money — with a clear payback timeline.
Three steps to your personalised battery recommendation
Import a CSV export from your smart meter or energy supplier — or enter your annual consumption manually.
Choose your current energy tariff from our UK tariff library, or enter a custom rate. We factor in time-of-use pricing.
See the optimal battery size, projected annual savings, and a clear payback period — so you can buy with confidence.
No guesswork. No sales pitch. Just accurate numbers.
We simulate your battery against your actual half-hourly consumption data, not averages.
See exactly how many years until your battery pays for itself, based on current energy prices.
Compare leading home battery systems side by side to find the best fit for your home.
Supports Octopus Agile, Economy 7, and standard rates — including export tariffs for solar homes.
Have solar panels? We factor in your generation profile to maximise self-sufficiency.
No account needed. Get your full recommendation in seconds, completely free.
Takes less than 2 minutes. Free, instant, and no sign-up required.
Start for free