Free calculators that run your own numbers and price the options side by side. No sign-up, and the cheapest option that works is shown first, whoever sells it.
Tick what must stay on and for how long. See the watts and kilowatt-hours you need, then compare a power station, portable generator, standby generator and home battery on installed and 10-year cost.
Size my backup powerHow much to store for your household and how to keep it drinkable.
Days of food by household size, and what it costs to build.