Not medical advice. Consult your provider and your device manual.
How long could a BLUETTI AC70 power a CPAP?
Battery runtime math only: 768 Wh × 0.85 ÷ CPAP watts, using power figures printed in each device's manual.
| CPAP device | At manual "typical" draw | At manual peak / ceiling |
|---|---|---|
| ResMed AirSense 11 | 11.6 h (~1.5 nights of 8 h) | 8.9 h (~1.1 nights) |
| ResMed AirSense 10 (with humidifier) | 12.3 h (~1.5 nights of 8 h) | 6.3 h (~0.8 nights) |
| Philips DreamStation 2 | Not published | 8.2 h (~1.0 nights) |
Where the CPAP figures come from
- ResMed AirSense 11: Typical 56.1 W / peak 73.2 W (manual's 65 W power supply specs; the manual does not split by humidifier on/off) Manual (PDF)
- ResMed AirSense 10 (with humidifier): Typical 53 W / peak 104 W (manual's 90 W power supply specs for the device with humidifier; no humidifier-off figure given) Manual (PDF)
- Philips DreamStation 2: No wattage published. The manual says an 80 W power supply is required to support humidification and that battery/DC operation does not support humidification. We use 80 W only as a worst-case ceiling with humidifier. Manual (PDF)
Power-supply ratings describe the maximum the adapter is designed for; actual draw depends on pressure, humidifier and heated-tube settings, and room conditions. None of these manuals publishes separate with- and without-humidifier wattages, so we cannot show that split. Running a CPAP from its DC cord/adapter instead of the AC outlet avoids inverter losses; this site's figures assume AC.
BLUETTI AC70 specs
| Capacity | 768 Wh |
|---|---|
| Rated AC output | 1,000 W |
| Surge (peak) | 1,500 W |
| Battery chemistry | LiFePO4 |
| Estimated usable AC energy | ~653 Wh (at our 85% assumption) |
Source: BLUETTI product page. Manufacturer lists Power Lifting Mode up to 2000W for resistive heating loads.
Check BLUETTI AC70 on BLUETTI's site
Enter your own CPAP's measured watts in the calculator · CPAP hub