Case study · Tesla Powerwall 3 · Morley, Leeds
A Tesla Powerwall 3.
No solar panels needed.
Not every home needs solar panels to benefit from a battery. This house in Morley already had an electric car charger and a cheap overnight tariff. We fitted a Tesla Powerwall 3 on the outside wall, so it can fill up while electricity is cheap and run the house when it isn’t. Installed and commissioned in May 2026.
A Tesla Powerwall 3 with Backup Gateway, designed, installed and commissioned by Energy Giants.
The job in numbers
13.5kWh
Tesla Powerwall 3
Enough stored electricity to run a typical home for most of a day.1
0
Solar panels
This is a battery only system. It charges from the grid overnight, when electricity is cheapest.
£2.47
Each full charge
The value of a full battery charged overnight and used in the day, at today’s prices.3
1day
On site
Powerwall, Backup Gateway, a new earth rod and commissioning, all on 19 May 2026.2
The job
Cheap electricity at night, used during the day.
Some electricity tariffs now charge very little overnight, as long as you can use the power then. That’s easy if you have an electric car. It’s harder for the washing machine, the oven and the kettle, which you want during the day.
A battery bridges the gap. The Powerwall charges from the grid in the cheap hours, then runs the house through the day, so the home buys far less electricity at the full price.
This house already had an electric car charger on the wall by the drive. We mounted the Powerwall 3 on the same wall, next to the meter, with a Tesla Backup Gateway and a new earth rod. Everything is outside, so nothing takes up room in the house or the garage.
There are no solar panels here, and the house didn’t need them for the battery to pay its way. If panels go on later, the Powerwall 3 already has a solar inverter built in, ready for them.
How it works
How a battery earns its keep without solar.
The battery moves cheap electricity from the night to the day. Two pictures of how it works.
A day with the Powerwall
On a cheap overnight tariff, the battery does the same job every day.
Overnight 11.30pm to 5.30am
Next day morning to evening
How it fits together
No panels. The Powerwall sits between the grid and the house.
- Panels on the roofNo panels, but the Powerwall is ready for them
- InverterBuilt into the Powerwall 3
- BatteryTesla Powerwall 3, 13.5 kWh, with Backup Gateway
- Your homeLights, kettle, EV, heat pump
- The gridCharges overnight at the cheap rate
What it saves
What a full battery is worth.
A battery without panels saves money by buying electricity when it’s cheap and using it when it isn’t. Here’s what one full charge is worth, at today’s prices.3
On the day
On the day.
What was installed
The specification.
| Property | Modern brick house with a garage and driveway in Morley, Leeds |
|---|---|
| Battery | Tesla Powerwall 3, 13.5 kWh, on the outside wall beside the meter |
| Extras | Tesla Backup Gateway and a new earth rod |
| Solar | None. The Powerwall 3 has a built in solar inverter if panels are added later |
| Already there | An electric car charger on the same wall, not part of this job |
| Grid | Northern Powergrid2 |
| Dates | Installed and commissioned 19 May 20262 |
| Investment | Between £6,500 and £8,000 for a Tesla Powerwall 3 on its own, VAT at 0%4 |
Questions people ask
Questions about batteries without solar.
Is a home battery worth it without solar panels?
It can be, if you’re on a tariff with cheap overnight electricity. At today’s prices a full Powerwall charged overnight and used in the day is worth about £2.47. Over a year that adds up, but it depends on your tariff and how much you use.
Can I add solar panels later?
Yes. The Powerwall 3 has a solar inverter built in, so panels can be connected to it later without a second inverter.
Will it run my house in a power cut?
A Powerwall 3 with a Backup Gateway can be set up to keep the house running in a power cut. We confirm what the setup will cover at survey, because it depends on your wiring and supply.
Keep reading
More like this.
Other Tesla jobs
On a cheap overnight tariff?
A battery could be worth more to you than you think, with or without panels. We’ll work it out from your actual usage.
Notes on the figures
- Battery details are from the project file and the installation certificate: Tesla Powerwall 3, 13.5 kWh, with a Tesla Backup Gateway. No solar panels were installed.
- Dates and grid are from the project file: installation and commissioning 19 May 2026, Northern Powergrid.
- Battery values are worked out at today’s prices with no assumed price rises. Electricity used from the battery instead of the grid is valued at 26.32p per kWh, the Ofgem price cap unit rate for 1 October to 31 December 2026 (GB average, Direct Debit). Overnight charging is valued at 8p per kWh, the Intelligent Octopus Go off peak rate from 1 October 2026. Solar that would otherwise be exported is valued at 12p per kWh, the Outgoing Octopus Fixed rate from 1 March 2026. The figures ignore small charging losses. Your tariff and habits will change the result. A full Powerwall charged overnight and used in the day: 13.5 kWh at 26.32p less 8p, about £2.47.
- The investment figure is an indicative range for a system of this size and specification; we do not publish the price a customer paid. Case study presented in line with section 5.3.3 of the Renewable Energy Consumer Code. The homeowner is not named, at our discretion.