CPAP Runtime Calculator
How many nights will a power station actually run your CPAP? Set your machine's draw, your sleep hours, and a station — the calculator does the math we publish on every guide: usable capacity is rated Wh × 0.85 for inverter loss (or full rated capacity on 12V DC), and nights round down to half nights.
Runtime figures are calculated from manufacturer-published specs, not field measurements. Your machine's real draw varies with pressure and temperature — measure it with a plug-in watt meter for exact numbers. Method: how we research.
1. Your CPAP's average draw
2. Hours of sleep per night
3. Power station
4. How the CPAP is plugged in
Anker SOLIX C1000 Gen 2 · 62W × 8 hrs/night · AC inverter
1.5 nights
870Wh usable ÷ 496Wh per night = 1.75 — rounded down to half nights, because a night you finish at 80% is not a night. Total runtime ≈ 14.0 hours.
See current price and specs for the Anker SOLIX C1000 Gen 2 →Go deeper:
- The full runtime comparison table — nights per station for common setups, and the three settings that move the math.
- Why the heated humidifier is the battery killer — turning it off roughly doubles your nights per charge.
- Running a CPAP on 12V DC vs the AC inverter — when the DC cable is worth it.
- Best portable power stations for CPAP (2026) — our picks from budget bundle to multi-night stations.