Phones, lights and a laptop on trips, or a CPAP (humidifier off) for about a night. About 8–10 lb. Best small power stations
Medium~1,000 Wh
A fridge overnight (about 12 h), a CPAP for 2–3 nights with the humidifier off, or Wi-Fi for a day and a half. About 24–28 lb. 1 kWh or 2 kWh?
Home backup2,000+ Wh
A fridge for about a day (about 24 h), kitchen appliances in short bursts, and multi-day outages with solar. About 41–53 lb. Best for home backup
Runtimes use hours = (Wh × 0.85) ÷ (watts + 10). Weights from official spec sheets.
One formula behind every number
hours = (Wh × 0.85) ÷ (watts + 10)
Wh
The battery capacity printed on the box.
× 0.85
About 15% is lost turning battery power into household AC.
watts
Your device’s average draw, not its startup spike.
+ 10
What the inverter uses just by being on.
Every guide works through an example you can check with a pocket calculator. How we research
Free printable: the Power Outage Runtime Chart
One page to keep on the fridge: how long a power station runs 13 common devices at 5 battery sizes, with the formula. Then a short email before Prime Big Deal Days, Black Friday and Cyber Monday. No spam; unsubscribe anytime.
Every guide is built from official specs, with the formula shown so you can check the math. Alejandro takes extra care with anything that touches health: CPAP, cold, heat and food safety. He isn't licensed to practice medicine in the U.S., and nothing here is medical advice.
