80W for eight hours needs about 753Wh
The estimate is 80W × 8h ÷ 0.85. An 800Wh-class station is the practical starting point.
Cold weather changes the result
Low battery temperature and a high blanket setting can reduce runtime, while thermostat cycling can extend it.
Add other devices before choosing
A fridge, lights, and phones increase total energy use. A 1kWh-class unit provides more overnight margin.


