Battery storage payback calculator
Battery payback with real off-peak tariff arbitrage
This is a free UK calculator. Enter your figures to get an instant, personalised result — no signup, no email capture, no upsell.
Frequently asked questions
Are home batteries worth it on Octopus Go?
On Go (8.5p overnight vs 28p peak), a 10kWh battery typically saves £600–£900/year and pays back in 6–9 years.
How long do home batteries last?
10–12 year warranties are standard, with 60–80% capacity guaranteed. Real-world life is typically 12–15+ years.
What's the cheapest battery per kWh?
Pylontech US5000 has the lowest battery £/kWh, but the all-in install cost (inverter + gateway + labour) often closes the gap with all-in-one units.