Home Battery Backup for Power Cuts in Scotland
Quick answerA home battery only powers your home in a power cut if it has backup equipment, usually a backup gateway or an emergency power supply (EPS) output. That typically adds £500–£900 to the installed price. Whole-home backup runs everything; essential-circuit backup keeps chosen circuits such as lights, fridge and boiler controls on.
Last updated: 30 October 2026 · Reviewed by the Scottish Energy Efficiency team
Winter storms regularly cut power to rural Scotland, sometimes for days. For homes that rely on electricity for heating, water and cooking, a battery with backup can keep essentials running. Not every battery does this out of the box, and how it is wired makes a big difference.
Why does backup power matter for rural Scottish homes?
Around 55% of rural Scottish homes are off the gas grid, according to the Scottish House Condition Survey 2023, so many rely on electricity, oil or LPG with electric controls. When a storm brings down lines, heating, water pumps and cooking can all stop. Rural repairs can take longer, so stored power is valuable.
Will my battery work in a power cut?
Not automatically. For safety, a grid-connected battery must disconnect when the grid fails, so without backup equipment it switches off too. With a backup gateway or EPS output, the battery isolates your home from the grid and keeps supplying power. Ask your installer to confirm backup is included and how it is wired.
What is the difference between whole-home and essential-circuit backup?
Whole-home backup keeps every circuit in the house running, limited only by the battery’s power and capacity. Essential-circuit backup moves a few chosen circuits, such as lights, fridge, router, boiler controls and a socket or two, onto a protected supply. Essential-circuit backup is cheaper and makes stored energy last much longer.
| Whole-home backup | Essential-circuit backup | |
|---|---|---|
| What stays on | Everything, up to the battery’s power limit | Chosen circuits only |
| How long 10kWh lasts | Hours to a day, depending on use | Often one to two days |
| Extra equipment | Backup gateway or whole-home switch | EPS output and a small sub-board |
| Typical extra cost | £500–£900 | Usually toward the lower end |
Typical extra cost for backup equipment, checked October 2026. Your installer confirms the cost after survey.
How much does battery backup cost?
A backup gateway or EPS setup typically adds £500–£900 to the installed price of a battery, checked October 2026. The cost depends on whether you want whole-home or essential-circuit backup, the condition of your consumer unit and how far the battery is from your meter. Some batteries include backup hardware as standard.
Which of the top 20 batteries can do whole-home backup?
From our top 20 comparison, the Tesla Powerwall 3 with its backup gateway, the Sigenergy SigenStor, Sunsynk systems, the EcoFlow PowerOcean and the Anker SOLIX X1 can all be set up for whole-home backup. Many others offer essential-circuit backup through an EPS output. Your installer confirms what your wiring supports.
How long will a battery run my home in a power cut?
Divide the battery’s usable kWh by what you use during the outage. A fridge, lights, router and boiler controls might use 0.3–0.5kW together, so a 10kWh battery could run them for roughly a day. Electric showers, ovens and heat pumps drain it in hours. With solar, the battery can recharge in daylight.
Frequently asked questions
Does a battery switch over automatically in a power cut?
With a backup gateway or EPS fitted, yes. Changeover usually takes under a second, so most appliances keep running.
Can a battery run an electric storage heater or heat pump in a power cut?
Only briefly. They draw a lot of power, so most homes keep heating controls and circulation pumps on rather than the heat source itself.
Do solar panels work in a power cut?
Only if the system has backup. Without it, solar inverters switch off for safety when the grid fails.
Is backup worth it if I rarely lose power?
If outages are rare and short, essential-circuit backup is usually enough. Remote and island homes often value whole-home backup more.