Battery storage
Tesla Powerwall installerTesla Powerwall.
We install the Tesla Powerwall 3 across Cheshire: Tesla’s home battery with the solar inverter built into the same box, so one unit runs the panels and the storage. Tesla publishes 13.5 kWh per unit and an output of up to 11.04 kW, with a Backup Gateway 2 beside it to hold the house up when the grid drops. It suits a household that wants the storage and the solar side from one manufacturer, on one app.
Tesla Powerwall
What it is, and who it suits.
One box, battery and inverter together
Powerwall 3 carries its own solar inverter: Tesla publishes three solar inputs with MPPTs and a solar-to-grid efficiency of 97.5 %, so a new array and the battery are wired to the same unit rather than to two.
The gateway does the switching
Powerwall 3 is installed with a Backup Gateway 2, which controls the grid connection, monitors what the house is drawing and manages the transition into and out of backup.
Room to add later
Tesla lists up to four Powerwall 3 units and up to three Expansion units, seven in total on one system. An Expansion is battery only: no inverter, no solar connection, and it cannot be fitted without a Powerwall 3 to run it.
Indoors or outdoors
The published enclosure rating is IP55 and the unit is rated for indoor and outdoor installation, floor or wall mounted, from −20 °C to 50 °C. Tesla also publishes flood resistance up to 0.6 m.
What the app does
The Tesla mobile app is the homeowner’s interface. Storm Watch charges the battery to full ahead of forecast severe weather, and the settings can be set so a car charges only from surplus solar.
The electrical side
Powerwall 3 is published as a 230 V single-phase 50 Hz product, with G98, G99 and G100 listed under grid interoperability. Those are the standards the network operator works to when the system is notified.
Published figures
The numbers, and where they come from.
Every line below is the manufacturer's own published figure. The exact model for your house is settled at the survey.
| What | Published figure | Source |
|---|---|---|
| Energy capacity | 13.5 kWh per unit, with further capacity from a Powerwall 3 Expansion | tesla.com |
| Power output | Up to 11.04 kW on grid and in backup, depending on local conditions | tesla.com |
| Integrated solar inverter | Solar-to-grid efficiency 97.5 %, three solar inputs with MPPTs | tesla.com |
| Round-trip efficiency | 89 %, solar to battery to grid | energylibrary.tesla.com |
| Size and weight | 1,105 × 609 × 193 mm, 130 kg | tesla.com |
| Enclosure and siting | IP55 enclosure, indoor and outdoor rated, floor or wall mounted, −20 °C to 50 °C | energylibrary.tesla.com |
| Backup gateway | Installed with Backup Gateway 2, which controls the grid connection, monitors home consumption and manages the transition to and from backup | energylibrary.tesla.com |
| Scalability | Up to four Powerwall 3 units and up to three Expansion units, seven units in total | energylibrary.tesla.com |
On the day
What fitting a Tesla Powerwall battery involves.
- At a published 130 kg, the base or the wall has to be right for it — that is a survey question, not a delivery-day one.
- A Backup Gateway 2 goes in with it to control the grid connection and manage the switch into backup.
- Connectivity is Wi-Fi, wired Ethernet or cellular, so monitoring still works where house Wi-Fi does not reach the wall.
- Under 50 dB(A) typical at one metre is quiet, but it is not silent: siting under a bedroom window is worth a thought.
- The grid connection is notified to the network operator under G98 or G99 before it goes live.
From the Google profile
Homeowners on their storage.
These are reviews of the installation rather than the hardware — most of them name no brand at all.
Where we fit it
Tesla Powerwall installation, region by region.
Each region page lists its towns, its network operators and what its homes are like.
- Tesla Powerwall installer in CheshireCheshire
- Tesla Powerwall installer in Merseyside & WirralMerseyside and the Wirral
- Tesla Powerwall installer in Greater ManchesterGreater Manchester
The long read: Tesla Powerwall 3, explained part by part.
Where next
The rest of the kit, and the work it goes with.
Other kit we fit
Sources for this page: tesla.com — powerwall · energylibrary.tesla.com — GUID 77BFC6C0 346E 4838 8578 26A5… · energylibrary.tesla.com — GUID 1A055DF0 53E5 4AC2 ADB0 1B0D…
Start here
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Tell us the postcode and roughly what you use. We’ll tell you honestly whether the roof is worth doing — and if it isn’t, that’s a perfectly good answer too.
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