INTERACTIVE TOOL
What could a battery save you?
Quick answer: A typical 5 kWh battery in Scotland saves £280–£380 in year one, mostly from grid arbitrage on a time-of-use tariff. Enter your own tariff rates, solar size, and usage below to get a personalised estimate with all assumptions shown.
In Scotland, grid arbitrage — charging overnight at off-peak rates and using at peak — is roughly 76% of the benefit, because Scottish solar yield is lower and the peak/off-peak spread is wide. This calculator models both solar self-consumption and grid arbitrage.
Battery savings calculator
Estimate what a battery could save you. All figures are illustrative — a free survey gives exact numbers for your property.
Duracell Dura5 = 5.32 kWh
Typical: 1–1.5. Never more than 2.
Outgoing Octopus flat: 12p (from 1 Mar 2026)
Surplus that would otherwise export
Illustrative annual saving
In Scotland, grid arbitrage (charging cheap, using at peak) is roughly 76% of the benefit — Scottish solar yield is lower but the peak/off-peak spread is wide.
| Year | Annual saving | Cumulative |
|---|---|---|
| 1 | £446 | £446 |
| 2 | £439 | £885 |
| 3 | £431 | £1,316 |
| 4 | £424 | £1,741 |
| 5 | £418 | £2,159 |
| 6 | £412 | £2,571 |
| 7 | £406 | £2,976 |
| 8 | £400 | £3,376 |
| 9 | £394 | £3,769 |
| 10 | £388 | £4,157 |
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Data sourced from real Scottish tariff rates and MCS MIS 3002 methodology. Last updated: August 2026.