Solar and battery calculator
Compare solar electricity costs with and without a battery using editable assumptions.
Calculator
Solar with and without a battery
Enter your Smart Export Guarantee rate.
Must be above 0.
| Per year | Without battery | With battery |
|---|---|---|
| Solar used at home | 1,400 kWh | 3,043 kWh |
| Grid imports | 2,100 kWh | 458 kWh |
| Exports | 2,400 kWh | 575 kWh |
| Bill saving | £350 | £761 |
| Export income | £360 | £86 |
- Extra annual benefit from the battery
- £137
- Simple battery payback
- 33.6 years
- Sensitivity range
- £53 – £219 / yr
Warning: the modelled payback exceeds the battery life you entered.
Sensitivity: low case uses 20% less generation, 10% less use and a 20% lower import rate; high case uses 10% more generation and use and a 20% higher import rate.
Never treat this as a guaranteed saving. Assumed battery behaviour: charges only from solar surplus, at most one full cycle a day, and discharges to meet evening demand before any grid import. Time-of-use charging is not modelled.
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