Battery costs
Storage is more than
a price per kWh.
Capacity matters, but so do power, warranty conditions, inverter architecture, electrical work and whether backup capability is included.
Combined-system examples
How storage changes the model.
These examples compare simultaneous solar-only and solar-plus-battery installations. Retrofit battery projects need a separate compatibility and installation quote.
| Estimated demand | Modelled battery | Solar only | Solar + battery | Modelled annual benefit |
|---|---|---|---|---|
| 3,360 kWh/yr | 5 kWh | £5,200–£6,500 | £9,100–£11,300 | £815/yr |
| 5,760 kWh/yr | 7 kWh | £7,400–£9,300 | £11,800–£14,600 | £1,359/yr |
| 9,600 kWh/yr | 10 kWh | £10,500–£13,000 | £15,400–£19,200 | £2,084/yr |
Illustrative outputs use the published Veyzo assumptions. Actual tariffs, solar surplus, load timing, equipment and property scope can change both cost and benefit.
Compare batteries
Four numbers to read together.
Usable capacity
The energy available to the home after the manufacturer’s operating limits—not just the nameplate figure.
Continuous power
How much simultaneous household demand the battery and inverter can supply.
Warranty terms
Years, cycle limits, throughput and retained-capacity conditions should be read together.
Backup design
Whole-home or selected-circuit backup may need additional equipment and is not standard on every system.
Fit before size
Model the home, then price the hardware.
A larger battery is not automatically better. Start with evening demand, expected surplus, tariff, charge rate and the outcomes you actually want.