Tesla Powerwall 3
A wall-mounted 13.5 kWh home battery with a built-in solar inverter.
- Best for whole-home backup
- Installed system
- 13.5 kWh
- 10-year warranty
- Energy: 13.5 kWh per unit, expandable to 54 kWh with up to three Expansion units. A full system of four Powerwall 3 units and three Expansions stores up to 94.5 kWh.
- Power: configurable from 3.68 kW to 11.04 kW (Tesla's UK/EU datasheet; figures differ by region).
- Includes a solar inverter, so it can connect to solar panels directly.
Not tested by us
We have not tested the Tesla Powerwall 3. The figures on this page come from the sources listed at the end of the page, checked on 10 November 2026, and we do not show prices. "Best for" is based on what the maker says the product is designed for, not on our own tests.
Key figures
13.5 kWh
Nominal energy per unit
11.04 kW
Maximum AC output
54 kWh
Maximum with 3 Expansions
Specifications
Last checked on 10 November 2026. The grey text under each name explains what the value means.
| Specification | Value |
|---|---|
| Storage | |
| Nominal energyThe energy rating on the datasheet. The part you can actually use can be slightly lower. | 13.5 kWh (AC) |
| ExpansionExtra battery units that add storage to the same system. | Up to three Powerwall 3 Expansion units of 13.5 kWh each, connected to the lead Powerwall 3: 54 kWh with one Powerwall 3. A system can combine up to four Powerwall 3 units and three Expansions (7 units, 94.5 kWh), according to the datasheet. |
| Power | |
| AC output (continuous)The power it can deliver all the time. Add up the watts of what you want to run at once and stay below this. | Configurable: 3.68, 5, 6, 7, 8, 9, 10 or 11.04 kW at 230 V |
| Charge powerThe maximum charging power from solar or the grid. | Up to 5 kW; up to 8 kW with Expansions |
| Solar-to-grid efficiencyHow much of the solar energy that reaches the inverter comes out as usable AC power. It is not the same as round-trip efficiency, which includes charging and discharging the battery. | 97.5 %. Tesla does not give a round-trip figure on its product page. |
| Backup in a power cutWhether it can keep selected circuits running during a grid outage. | Yes, with a Backup Gateway 2, which Tesla says is required for backup. The datasheet gives no separate backup power figure; the AC output options apply. |
| Solar | |
| Solar inverterTurns the DC power from solar panels into AC for the home. Built in means no separate solar inverter is needed. | Built in (hybrid) |
| Solar inputsThe number of panel strings it can track separately (MPPT) and the total DC power. | 3 MPPT inputs |
| Connection and housing | |
| Grid connectionThe supply type it is built for. Check it matches your home's supply. | 230 V, single phase, 50 Hz (UK/EU version) |
| Dimensions (H × W × D)Check the wall or floor space before you buy, including room for airflow and cables. | 1,105 × 609 × 193 mm |
| WeightMatters for lifting, wall mounting and moving it. | 130 kg |
| Operating temperatureThe range it is rated to work in. Cold and heat can reduce performance. | −20 to 50 °C |
| Flood and dust resistanceHow well the unit copes with water and dust. Check the maker's installation guidance for where it may be mounted. | Flood resistant up to 0.6 m. Tesla gives no IP rating on its product page. |
| Warranty | |
| WarrantyThe period the maker covers. Read the terms: conditions and capacity guarantees differ. | 10 years. Tesla says the Powerwall 3 must be reliably connected to the internet to secure the full warranty. |
Compatible with
What Tesla says this product works with. Anything not listed here is not confirmed.
- Expansion
- Powerwall 3 Expansion units (13.5 kWh each), up to three per system, connected to the lead Powerwall 3. The datasheet allows up to four Powerwall 3 units plus three Expansions.
- Backup
- Backup Gateway 2, which the datasheet lists for backup in a power cut.
- Solar panels
- Connects directly: the Powerwall 3 has a built-in solar inverter with three MPPT inputs.
- Electric vehicles
- Tesla says a Cybertruck or Model Y can be connected to use the energy in the car's battery to extend home backup.
Rules where you live
An installed battery normally needs a qualified electrician, and in many countries you must also tell your grid operator, especially if it can export. Rules, incentives and tax treatment differ by country: see our country guides.
Strengths and things to check
Strengths
- Battery and solar inverter in one unit
- Output up to 11.04 kW (UK/EU datasheet)
- Can be expanded to 54 kWh (up to 94.5 kWh with four units and three Expansions)
- 10-year warranty
Worth checking before you buy
- The full warranty depends on a reliable internet connection
- Heavy: about 130 kg, so check where it can be mounted
- Tesla quotes solar-to-grid efficiency (97.5%) rather than a round-trip figure, so it is not directly comparable with other batteries
- Price depends on the installer's quote, so compare several
Change log
We record changes to this page here, so you can see when figures such as the warranty were last updated.
- 10 November 2026
- Page published. Warranty at publication: 10 years, with the condition that the Powerwall 3 is reliably connected to the internet (Tesla UK datasheet).
- 10 November 2026
- Datasheet read in full and checked against this page: AC options, charge power, warranty condition and Backup Gateway 2 confirmed; backup power no longer shown as a separate figure because Tesla gives none. Sources limited to Tesla's own pages. Dimensions corrected to 1,105 × 609 × 193 mm and efficiency shown as Tesla's solar-to-grid figure of 97.5%.
- 10 November 2026
- Expansion capacity clarified: one Powerwall 3 with three Expansions stores 54 kWh; the UK datasheet allows up to four Powerwall 3 units plus three Expansions (7 units, 94.5 kWh). Tesla's page wording of 40.5 kWh per unit refers to the three Expansions.
Where this information comes from
We have not tested the Powerwall 3. Every figure above comes from Tesla's own UK Powerwall page and its UK datasheet, last checked on 10 November 2026. The figures are for the UK version. Other regions differ: Tesla's US page, for example, lists 11.5 kW and six solar inputs. Check the version sold where you live.
Where sources disagree we say so. We do not show prices, because they depend on the installer's quote.
- Manufacturer Tesla UK Powerwall page
- Manufacturer Tesla UK Powerwall 3 datasheet
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Common questions about Tesla Powerwall 3
How much capacity does the Powerwall 3 have?
Tesla's datasheet lists 13.5 kWh of nominal battery energy per unit. Each Expansion unit adds another 13.5 kWh, and a system takes up to three Expansions. One Powerwall 3 with three Expansions stores 54 kWh; the datasheet's maximum of four Powerwall 3 units plus three Expansions stores 94.5 kWh.
Does the Powerwall 3 include a solar inverter?
Yes. Tesla describes it as self-contained with an integrated solar inverter, so it can connect to solar panels directly.
Can I use a Powerwall 3 without solar panels?
The datasheet lists AC charging up to 5 kW, so it can charge from the grid as well as from solar. Whether that pays back depends on your tariff: see our guide to home batteries without solar panels.
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