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Powerwall 3 (13.5 kWh)

House Verdict
9.4/10
★★★★★

The Powerwall 3 integrates a hybrid solar inverter, simplifies the install when solar and battery go in together, and runs on the best app and tariff integration in the segment. The unit most UK homeowners ask for by name, and the one most installers benchmark every other battery against.

Round-trip efficiency
Above 90%
Running cost
£-780/yr
Installed
£8,500 to £11,500 installed
Best for
Solar + battery togetherTime-of-use tariffsApp-first households
Sleek white slim wall-mounted home battery in a clean utility room with pale plaster walls.

Editorial render. Not a manufacturer photograph; we do not redistribute press imagery without a licence.

Primary question · Is the Powerwall 3 still the default battery to compare everything else to?

The five questions
Is this right for me?

Households installing solar and battery together on a time-of-use tariff who want the simplest integrated system.

What will it cost?

£8,500 to £11,500 installed

Advantages
  • Best-in-class app and integration
  • Strong real-world reliability data
  • Hybrid inverter built in
Trade-offs
  • Premium pricing per usable kWh
  • UK availability has been patchy through the rollout
What to do next

Open the cost planner to estimate your installed price.

Key specifications

Usable capacity
13.5 kWh
Continuous power
11.5 kW
Round-trip efficiency
Above 90%
Warranty
10 years, 70% capacity retention
Perfect for
Households installing solar and battery together on a time-of-use tariff who want the simplest integrated system.
Avoid if
You only need a small storage uplift on an existing solar install; a 5 kWh AC-coupled battery from GivEnergy is the cheaper, more proportionate answer.
What we like
  • , Best-in-class app and integration
  • , Strong real-world reliability data
  • , Hybrid inverter built in
What we don't
  • , Premium pricing per usable kWh
  • , UK availability has been patchy through the rollout
House Verdict · Confidence: high
★★★★★
Worth considering instead
House Summary

If your brief matches "households installing solar and battery together on a time-of-use tariff who want the simplest integrated system.", the Powerwall 3 (13.5 kWh) is a confident pick. If it doesn't, the alternatives above are more honest answers.

Related decisions
Next Step

Estimate your installed cost

The planner uses your specific home; not a brochure number.

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