Why this site exists
Most people buy a power station for one job: a CPAP, a fridge, a sump pump. The question is always the same. Will it run it, and for how long? That answer is arithmetic, and most buying guides never show it.
Watt Math shows it. We keep a spec sheet for 15 current power stations and the power draw of 41 common devices, then divide one by the other. That division is where the logo comes from.
What we are not
We are not a test lab. Nobody here has bench-tested these units, and no guide claims hands-on use. When a number is disappointing, like 36 minutes of space heater from a 1,000Wh battery, we print it anyway.
Where the numbers come from
Every spec is taken from the maker's own product page, and each model's page links to it. Where a maker does not publish a figure, we say so instead of filling the gap. The full method is here.
How we are paid
Through affiliate links. If you buy after clicking a "Check price" button, the store may pay us a commission. The tables list every model we track whether or not it earns us anything.More on that here.