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)
4.2 £45 – £65
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CyberPower
CP550 Mini UPS for Router & Broadband
Keeps your WiFi router and modem online during short power cuts.
Output
330W
Battery
84Wh
Chemistry
Lead-acid
Can it run…?
Each device on its own, with typical UK wattages.
Wi-Fi router + fibre box
~2h 58m
CPAP machine
~1h 18m
Fridge-freezer
~47 min
Gas boiler (pump & controls)
~18 min
LED lights (6 bulbs)
~59 min
55" TV
~24 min
Kettle
needs 3,000W
Runtime estimatordrag to set your load
LOAD
—
RUNTIME
—
Key specs
Capacity550VA / 330W
TopologyStandby
Outlets4x UK (battery + surge)
Runtime (light load)Up to ~1 hour for router/ONT only
Ideal forRouter, ONT/modem, VoIP base station
Our take
Small but genuinely useful: if you work from home or rely on a landline replacement (VoIP), a tiny UPS just for your router and modem means you keep internet and phone access during a short power cut, even if the rest of the house is dark.
Not sure it's big enough?
Power Sizer
Add your own devices and compare it against everything else.
Also in Home & Solar
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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.
Fridge-freezer: ~1d 20h
4.5 £2,200 – £3,000
Top pick
Jackery
Explorer 2000 Plus
An expandable solar generator that's ideal for backing up essential home circuits.
Fridge-freezer: ~1d 5h
4.4 £1,400 – £1,900