Home energy calculators that show their working
Size a power station, see what it costs to run your appliances, and find out whether charging a battery on a cheap night rate actually pays. For the US and the UK. Every answer comes from makers’ own published figures, and says plainly when something doesn’t fit or doesn’t pay.
Power station sizer
Which portable power station runs your appliances, handles the start-up surge, and lasts the day? 79 models from 4 brands.
Open the calculator →Charge at night, use by day
Does charging a battery on a cheap night rate save money once you count the battery’s wear?
Coming nextAppliance running costs
What your fridge, heater or TV costs to run on your tariff.
PlannedHeat pump vs gas
Running cost at your local temperatures, plus the grants you can get.
PlannedEach spec links to the maker’s page it came from and the date we checked it.
Models that can’t do the job are listed too, with the reason.
Order comes from specs and your inputs, never from commission.