Tell us about your home
Enter your postcode and import your smart meter data — or just enter your annual usage. Tell us if you already have solar panels or a battery.
Solar panels, a home battery,
or both — what's right for your home?
Upload your smart meter data and get a personalised recommendation in seconds — with real savings figures, a clear payback timeline, and an AI-powered explanation of why. Completely free, no sign-up needed.
How it works
Three steps to your personalised recommendation
We model your options
Our engine simulates solar, battery, and combined scenarios against your real consumption and the major UK time-of-use tariffs.
Get a clear recommendation
See your best option, projected annual savings, payback period, and a plain-English AI explanation of why it suits your home.
Built for UK homeowners
Whether you're starting from scratch or already have solar or a battery, BatterySizer works out the numbers for your specific situation.
Personalised to your home
Upload your half-hourly smart meter data or enter your annual usage. We model your real consumption patterns, not UK averages.
Already have solar or a battery?
Tell us what you already have and we'll show you the incremental value of adding the missing piece — with costs and savings calculated on top of your existing setup.
All major UK tariffs compared
We run your data against Octopus Go, Intelligent Go, Economy 7, and more — so you see which tariff and system combination maximises your savings.
AI-powered plain-English explanation
Get a clear, jargon-free explanation of your recommendation — why it suits your consumption profile, which tariff to pair it with, and what to expect.
Clear payback and ROI
See your break-even point, 10-year return on investment, and annual saving in pounds — so you can make a confident, informed buying decision.
Carbon savings included
We factor in UK grid carbon intensity so you can see the environmental impact of your system — in kg CO₂ saved and trees equivalent.
Ready to find your best option?
Takes less than 2 minutes. Free, instant, and no sign-up required.
Get My Free Recommendation