Top pick
EcoFlow
PowerOcean Home Battery System
Pairs with rooftop solar to power your whole home through a grid outage.
Fridge-freezer: ~5d 22h
4.6 From £4,500 (installed)
4.5 £2,200 – £3,000
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Bluetti
AC300 + B300 Home Backup Kit
A modular battery and inverter combo that can power a fridge, router and lighting for days.
Output
3,000W
Battery
3,072Wh
Chemistry
Lithium
Can it run…?
Each device on its own, with typical UK wattages.
Wi-Fi router + fibre box
~5d 11h
CPAP machine
~2d 17h
Fridge-freezer
~1d 20h
Gas boiler (pump & controls)
~21h 46m
LED lights (6 bulbs)
~2d 4h
55" TV
~1d 2h
Kettle
~52 min
Runtime estimatordrag to set your load
LOAD
—
RUNTIME
—
Key specs
Battery capacity3072Wh (expandable to 12kWh+)
AC output3000W (6000W surge)
ChargingAC wall, solar, or car
OutletsAC, USB-C PD, 12V DC
Ideal forPartial home backup without rewiring
ExtrasCan integrate with a transfer switch
Our take
A step below a fully-installed whole-home system: this stackable battery-and-inverter unit plugs into a transfer switch (or just extension leads) to keep your essentials running, and it can travel with you if you move house.
Not sure it's big enough?
Power Sizer
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Also in Home & Solar
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Jackery
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An expandable solar generator that's ideal for backing up essential home circuits.
Fridge-freezer: ~1d 5h
4.4 £1,400 – £1,900
CyberPower
CP550 Mini UPS for Router & Broadband
Keeps your WiFi router and modem online during short power cuts.
Fridge-freezer: ~47 min
4.2 £45 – £65