What Size Generator Do I Need for Home Backup?
Adding appliance wattages is only the first step in generator sizing. Learn how to calculate running load, account for starting surge and allow sensible headroom for UK home backup.
Backup Power Sizing
Guides to watts, watt-hours, surge loads, runtime and choosing an appropriate backup-power size.
What Size Portable Power Station Do I Need?
Find the right portable power station by comparing continuous watts, starting surge and usable watt-hours. Includes UK-specific checks, runtime guidance and a practical sizing method.
Usable Wh vs Battery Capacity: Why the Number on the Box Is Not Your Runtime
Nominal watt-hours are not the same as the energy your appliances can use. Learn how usable capacity, inverter losses, appliance demand and planning headroom affect backup-battery runtime.
How Much Backup Power Do I Need for My Home?
Work out the backup power your UK home needs by listing essential loads, adding watts and starting demand, then calculating usable watt-hours for the outage duration.
Running Watts vs Starting Watts: What Backup Power Buyers Need to Know
A fridge or pump may use modest power once running but need a much larger burst to start. Learn how running watts, starting watts and surge ratings affect inverter and generator sizing.
How to Size Home Backup Power: A UK Calculator Guide
Learn how to size home backup power in the UK by calculating running watts, starting surge, runtime and usable battery capacity for the appliances you need during a power cut.