Home Battery Storage & Backup Power Guide
Discover how to protect your home from winter power cuts, slash electricity bills with smart time-of-use tariffs (e.g. Octopus Flux, Agile, E.ON Drive), capitalise on the UK 0% VAT exemption, and look up emergency DNO contact helplines.
Interactive Blackout Sizer: What Powers Your Home During an Outage?
Select the household circuits and appliances you want backed up during a power cut. We calculate your required wattage and battery runtime.
Combined power draw of your 5 active devices.
Temporary peak when fridge/pump compressors start up.
Usable battery capacity recommended with 15% safety buffer.
Portable inverter generator (e.g. 2kW–3kW) sufficient
A modular 5kWh to 6kWh battery (such as Enphase 5P or Fox ESS EP5) will easily sustain these circuits throughout the outage.
Smart Time-of-Use Tariff Arbitrage Calculator
Even without solar panels, a home battery can pay for itself in the UK. Charge it at cheap off-peak night rates (e.g., Octopus Flux, Agile, E.ON Drive) and power your home during expensive daytime peak hours.
Shifting 10 kWh daily from 27p to 7.5p saves £2.34 per day.
Looking for tariffs that reward home battery owners?
Compare time-of-use tariffs like Octopus Agile, Octopus Flux, and E.ON Next Drive to maximize your battery's annual earnings.