A 1000Wh battery sounds simple until you start plugging real devices into it. In practice, battery runtime depends on load, inverter losses, weather and how much of the battery you actually plan to use.
If you run a 60W device continuously and your system efficiency is around 90 percent with 85 percent usable capacity, your runtime is much lower than the headline number on the label suggests. That is why planning with usable energy is more helpful than planning with advertised energy.
For camp fridges, lights, routers and Starlink, the better approach is to list daily loads first. Once you know how many watt-hours you burn in a day, a 1000Wh battery stops being an abstract product and becomes a real trip planning tool.
This is also why a power station that feels huge on a weekend camp can still feel small during poor weather or heavy work-from-road days. Margin matters more than people expect.