Tesla Powerwall 3.
Prices & installation.

Our Tesla Powerwall 3 battery packages start from £7,945 including installation and VAT. This is an installed package price, rather than the cost of buying the battery alone.

A Tesla Gateway is an optional £995 installed extra and is not included in the starting package price. The final price depends on the storage you choose, whether you are adding solar panels, the electrical work needed and your backup requirements. For example, one Powerwall 3 and an expansion unit provide more storage than a single battery, but are a different package to compare.

When comparing quotes, check the total battery capacity, installation work and whether backup equipment is included. Your proposal will set out the system and work agreed for your home.

No. Powerwall can charge from the electricity grid, so you can install it without solar panels or a Tesla car. With a suitable time-of-use tariff, you can store electricity during cheaper periods and use it later in the day.

If you have solar panels, the battery can also store surplus generation instead of exporting it straight away. This can be useful when your panels generate most of their electricity while you are out, but you use more at home in the evening.

Grid charging depends on your system settings and any supplier restrictions. Compare the whole tariff, including daytime and export rates, rather than choosing on the overnight rate alone.

An existing solar system can be considered for a Powerwall upgrade, but we need to check the equipment before confirming a suitable design. Send us the details of your panels, inverter and any battery you already have.

Powerwall 3 has an integrated solar inverter. Whether that is used, or how the battery connects alongside your existing equipment, depends on the installation. An existing battery should not be assumed to work with the new system.

The review also needs to consider your electricity supply, proposed battery position and any network approval required. This helps establish the complete work involved before you choose a package.

Powerwall 3 provides 13.5 kWh of battery storage. Adding one Powerwall 3 Expansion unit brings the total to 27 kWh. The expansion unit adds stored energy, rather than another full inverter.

The right size depends on how much electricity you use and when you use it. A home with a heat pump or an electric car may have very different needs from another home with the same number of bedrooms. Your electricity bills and usage history are more useful than house size alone.

Capacity and output also mean different things: kWh describes how much energy you can store, while kW describes how quickly it can be supplied. We can discuss both, along with any backup reserve and plans to add more storage later. Running several high-power appliances will use the charge faster.

Powerwall can reduce the electricity you buy at more expensive times by storing surplus solar energy or cheaper grid electricity. The benefit depends on your usage and tariff, so there is no single annual saving or payback period for every home.

For example, a household that uses most of its electricity in the evening may benefit from storing daytime solar generation. Without solar, the opportunity comes from the difference between cheaper charging periods and the rate you would otherwise pay.

A useful estimate should account for battery losses, import and export rates, how much stored electricity you will actually use and the full installation cost. Share your bills and tariff with us so the proposed system reflects your household rather than a generic savings figure.

A Tesla Gateway enables Powerwall to provide backup power as part of a suitably designed installation. You do not need the optional Gateway for a non-backup setup, but you do need it with our backup installation if you want to power your home during a power cut. Our optional Tesla Gateway costs £995 installed and is not included in the package prices. A non-backup installation will not supply your home during a power cut.

Tell us which circuits and appliances you want to keep running so these can be considered in the design. Backing up lighting, refrigeration and essential small appliances is a different requirement from running an oven, heat pump and EV charger together.

How long backup lasts depends on the charge available, the reserve you keep and the electricity being used. More storage can extend the time available, but does not automatically increase the power the system can deliver at once. Check the backup scope in your proposal before ordering.

iHeat is a Tesla Certified Installer. We arrange a free call to prepare your no-obligation proposal. Before fitting, we review your existing setup, agree the equipment and battery position, and confirm the installation arrangements. Powerwall 3 is designed for indoor or outdoor use, but the location still needs suitable access, clearances and mounting conditions.

Tesla describes a typical Powerwall installation as a full day. Additional electrical work, extra batteries or fitting solar panels at the same time can take longer. There will be a planned electricity interruption while connections are made; let us know about any essential powered equipment beforehand.

The system is then commissioned and connected for monitoring in the Tesla app. An active internet connection is needed for monitoring and updates, so connectivity at the installation location is part of the preparation. We will explain the plan for your home before installation day.

Tesla provides a 10-year limited Powerwall warranty, subject to its terms and operating conditions. For solar self-consumption, time-based control and backup, its European warranty specifies 70% energy retention at 10 years and unlimited cycles. Other uses may have a throughput limit.

Energy retention describes how much capacity remains over time; it is not a promise of a particular bill saving or backup runtime. A reliable internet connection is required for the full warranty. Read the terms supplied with your system and keep your installation paperwork.

If you need help after installation, contact iHeat or use our report-an-issue page. Our aftercare team can review the details and help arrange the appropriate next steps. Tesla also provides product troubleshooting through its app and support site.