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What size power station do you need?
Updated
Pick a device below to see how long it will run. The math: capacity times 0.9, divided by your device's watts plus about 10W of inverter overhead.
Runtime calculator
Estimate. Assumes 90% usable energy plus about 10W that the power station's own inverter burns while its AC outlets are on. Check the label on your own device for real wattage.
- WiFi router (10W)46.1 hours
- CPAP, humidifier off (15W)36.9 hours
- Full-size fridge, averaged (55W)14.2 hours
- Laptop (60W)13.2 hours
- CPAP with heated humidifier (70W)11.5 hours
- TV (100W)8.4 hours
Common device wattages
| Device | Typical draw | Notes |
|---|---|---|
| Phone charging | 10 to 20W | About 12 to 20Wh per full charge |
| WiFi router + modem | 10 to 20W | |
| Laptop | 45 to 90W | |
| CPAP | 10 to 25W average | Heated humidifier and hose raise it to 50 to 90W |
| Full-size fridge | 100 to 200W running | Cycles on and off. Plan on 1 to 1.5 kWh per day |
| Microwave | 1,000 to 1,500W | Needs a 1,500W+ inverter |
| Space heater | 1,500W | Drains 1 kWh in about 35 minutes. Not practical |
Rules of thumb
- Devices only (phones, laptops, lights): 300Wh. See the Anker SOLIX C300.
- One-night outage with a fridge: 1,000Wh or more. See the Anker SOLIX C1000 Gen 2.
- Multi-day outages: add solar panels or look at 2,000Wh+ units. A battery alone cannot do it.