Whole-house backup power · installer introductions
Keep the whole house running
A kit keeps your family going. A home battery or a standby generator keeps the house going: the boiler controls, the fridge, the router, the lights and the gates. Tell us about your home and we'll introduce you to one installer we have checked.
The thing most people get wrong
Solar panels alone go dark in a power cut
It's a safety rule: when the grid goes down, a solar inverter has to switch off so it can't feed power into lines engineers may be working on. To keep the house running you need a battery with a backup gateway, which isolates your home from the grid, or a generator that starts by itself.
The options
What keeps a house running
Prices are typical installed costs for UK homes, from the sources linked. Your installer quotes for your house.
| Option | What it does in a power cut | Typical cost |
|---|---|---|
| Home battery with backupTesla Powerwall 3, GivEnergy, Sigenergy, Fox ESS | Takes over within seconds, often instantly. Runs essential circuits for about a day, and longer with solar on the roof. | About £7,000 to £10,500 installed for 10 to 15 kWh. A Powerwall 3 with its backup gateway is typically £9,500 to £10,500. iHeat, MyJobQuote |
| Standby generatorGenerac, Rehlko (formerly Kohler) | Starts on its own within seconds and runs for days on mains gas or LPG. Big enough for the whole house. | About £3,000 to £20,000 installed, depending on size and fuel. MyBuilder |
| Portable power stationIn every kit from T+7 | Plugs in where you need it: lights, phones, the router and a fridge for hours. No installation. | Included in T+7 and above. |
How introductions work
You stay in charge of your details
We only introduce installers who are MCS certified for batteries and solar, or approved by the manufacturer for generators, and who carry public liability insurance. We never pass your details to more than one installer at a time.
- 01
Tell us about the house
Two minutes: postcode, the kind of property and what you want to keep running.
- 02
We name the installer first
We email you who we'd introduce, and share your details only when you say yes.
- 03
They survey and quote
You deal with the installer directly. No obligation.
- 04
We're paid by the installer
If a job goes ahead, the installer pays us an introduction fee. You pay T-MINUS nothing.
Introductions across London and the Home Counties
Tell us about the house
We reply within one working day with the installer we'd introduce. Nothing is shared until you say yes.
Questions
Before you ask
Want the family covered while the house is being done? T+7 includes a 1 kWh power station.