Power cut?

What will this battery run, and for how long?

Pick a battery and tick what you want to keep going. The answer allows for the 15% or so that every battery loses turning stored energy into something a plug can use. The battery sizes match the picks on the power page.

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What do you want to run?

These are typical figures. Your own devices will differ, and the label on the plug or the back of the appliance gives the real wattage. A fridge-freezer only draws power when its compressor is running, so the figure here is an average over the day.

If someone depends on powered medical equipment, don’t plan from a web calculator. Talk to the equipment supplier and join the Priority Services Register.