Tesla Powerwall 3: UK price, payback and specs
The Tesla Powerwall 3 is a 13.5kWh usable home battery with a 10-year warranty and 89% round-trip efficiency. Indicative installed cost in the UK is around £9,500.
Key specifications
- Usable capacity: 13.5 kWh
- Rated capacity: 13.5 kWh
- Round-trip efficiency: 89%
- Warranty: 10 years
- Indicative installed cost: £9,500
- Cost per usable kWh: £704
Highlights
- Built-in solar inverter (no separate hybrid needed)
- 11.5kW peak power output — runs heat pumps and EV charging
- 10-year warranty with unlimited cycles
At £704 per usable kWh, the Tesla Powerwall 3 sits in the mainstream bracket for UK home batteries. Use the payback calculator below to see how that pencils out against your own electricity tariff and solar generation.