How much does a Tesla Powerwall 3 cost in the UK?

Roughly £8,000 to £10,000 fully installed in early 2026, including the Tesla Gateway. Prices move, so use that as a ballpark and confirm the current figure with your installer. Fitting it alongside new solar is usually cheaper than retrofitting later.

What is the capacity of the Powerwall 3?

13.5 kWh. It uses lithium iron phosphate cells and has a solar inverter built in, and it can deliver up to 11.5 kW of continuous power, enough to run a home and charge an EV.

What makes the Powerwall 3 different from other batteries?

The main difference is the integrated solar inverter. Most home batteries need a separate inverter, while the Powerwall 3 combines the battery and inverter in one unit, which can simplify the install. It also has a high power output.

Does the Powerwall 3 have to be fitted by a Tesla installer?

Yes. It must be installed by a Tesla-certified installer, which is separate from MCS certification. Not every MCS-certified solar installer is Tesla-certified, so check before you commit to a Powerwall.

Is the Tesla Powerwall 3 worth it?

It suits larger homes with higher usage and homes with an EV, where its 13.5 kWh capacity and high output are put to work. For a smaller, low-usage home, a cheaper 5 kWh battery from another brand often makes more sense.

What warranty does the Powerwall 3 come with?

A 10-year warranty guaranteeing at least 70% capacity retention, so it should still hold at least seven tenths of its original charge after ten years.

Batteries & technology

Tesla Powerwall 3 in the UK: cost, specs, and what to know before buying

By Daniel Osei · Last checked 1 July 2026

The Powerwall 3 is Tesla’s home battery, and one of the best known in the UK. This page covers what it actually is, what it costs installed, who it suits and who it does not, and the couple of things worth knowing before you commit, including the Tesla-certified installer requirement.

The quick version

A 13.5 kWh battery with the solar inverter built in, which is what sets it apart from most rivals
Roughly £8,000 to £10,000 installed in early 2026, including the Tesla Gateway (verify current pricing)
Best for larger homes with higher usage, and homes with an EV, thanks to its high power output
Must be fitted by a Tesla-certified installer, which not every MCS-certified installer is
10-year warranty, guaranteeing at least 70% of capacity retained

What the Powerwall 3 actually is

The Powerwall 3 is a 13.5 kWh home battery that uses lithium iron phosphate (LFP) cells, a chemistry chosen for its long life and safety. Its defining feature is an integrated solar inverter. Most home batteries need a separate inverter to connect to your panels, whereas the Powerwall 3 combines the battery and the inverter in one unit, which can make for a tidier, simpler install.

It also has a high power output, delivering up to 11.5 kW continuously. That is enough to run a busy home and support EV charging at the same time, which is part of why it appeals to larger households.

What it costs in the UK

As a rough guide for early 2026, a Powerwall 3 is around £8,000 to £10,000 fully installed, including the Tesla Gateway that manages the system. Where you land in that range depends on your property, the complexity of the install and what else is being fitted at the same time.

Battery prices move, so treat this as a ballpark to sanity-check a quote rather than a fixed figure. Fitting a battery alongside a new solar system, rather than retrofitting later, usually works out cheaper because the scaffolding, labour and paperwork are shared.

Who it suits

The Powerwall 3 makes most sense for larger homes with higher electricity usage, where its 13.5 kWh capacity gets a proper daily workout. It suits households that have, or plan to get, an electric car, because its high output can run the home and charge the car. And it appeals to anyone who wants a single, integrated system from one manufacturer, with one app and one point of support.

Who it probably does not suit

If you are a smaller household with modest electricity use, a 13.5 kWh battery is likely more than you need. A 5 kWh battery from another brand could do the same job for your home at roughly half the cost, and would cycle more fully each day. Bigger is not better if the extra capacity sits part-used, so the honest answer for a low-usage home is often a smaller battery.

What size solar battery do I need?

The Tesla-certified installer requirement

The Powerwall 3 must be installed by a Tesla-certified installer. This is separate from MCS certification, and not every MCS-certified solar installer holds it. It is worth checking that an installer is Tesla-certified before you commit to a Powerwall, otherwise they cannot fit one and may steer you to a different battery.

Warranty

The Powerwall 3 comes with a 10-year warranty that guarantees it will retain at least 70% of its capacity over that period. In other words, after ten years it should still hold at least seven tenths of its original charge. That is in line with the better home batteries on the market.

Our position on brands

We are not affiliated with Tesla and do not push one brand over another. Whether the Powerwall 3 is the right battery for you depends on your home, your usage and what your installer can fit and support well. The work is carried out by MCS-certified installers, who can advise on the battery that suits your situation, and for a Powerwall that installer also needs to be Tesla-certified.

Compare the main UK battery brands

See what solar and a battery would do for your home

Put in your postcode and a couple of details for a quick estimate of system size, output, cost and payback.

Common questions

How much does a Tesla Powerwall 3 cost in the UK?: Roughly £8,000 to £10,000 fully installed in early 2026, including the Tesla Gateway. Prices move, so use that as a ballpark and confirm the current figure with your installer. Fitting it alongside new solar is usually cheaper than retrofitting later.
What is the capacity of the Powerwall 3?: 13.5 kWh. It uses lithium iron phosphate cells and has a solar inverter built in, and it can deliver up to 11.5 kW of continuous power, enough to run a home and charge an EV.
What makes the Powerwall 3 different from other batteries?: The main difference is the integrated solar inverter. Most home batteries need a separate inverter, while the Powerwall 3 combines the battery and inverter in one unit, which can simplify the install. It also has a high power output.
Does the Powerwall 3 have to be fitted by a Tesla installer?: Yes. It must be installed by a Tesla-certified installer, which is separate from MCS certification. Not every MCS-certified solar installer is Tesla-certified, so check before you commit to a Powerwall.
Is the Tesla Powerwall 3 worth it?: It suits larger homes with higher usage and homes with an EV, where its 13.5 kWh capacity and high output are put to work. For a smaller, low-usage home, a cheaper 5 kWh battery from another brand often makes more sense.
What warranty does the Powerwall 3 come with?: A 10-year warranty guaranteeing at least 70% capacity retention, so it should still hold at least seven tenths of its original charge after ten years.