What size power station runs a CPAP?
With the heated humidifier on, a ResMed AirSense 11 needs about 587 Wh of capacity per 8-hour night at our assumptions. Turn the humidifier off and the need drops a lot.
The numbers
ResMed's technical specs for the AirSense 11 list typical 56.1 W and peak 73.2 W power consumption with its 65 W power supply. Champion lists a CPAP without heat at 30–60 W. We use the 45 W midpoint, which is conservative. Some owners report far lower measured draw with heat off.
| Scenario | Wh/day from battery | Min capacity Wh | Cont. W | Surge W |
|---|---|---|---|---|
| AirSense 11 with humidifier, 8 h | 528 | 587 | 73 | 73 |
| With humidifier, 3 nights | 528 | 1,760 | 73 | 73 |
| Without humidifier (30–60 W range midpoint), 8 h | 424 | 471 | 60 | 60 |
| Without humidifier, 3 nights | 424 | 1,412 | 60 | 60 |
Assumptions: 85% inverter efficiency, 90% of rated capacity usable, no extra margin. Both are planning values, not measurements, and you can change them in the calculator.
Models in our table that fit one night with humidifier
Fits (cheapest first):
- BLUETTI AC70: 768 Wh, 1,000 W / 1,500 W surge, $359 (checked 2026-10-21). Runtime at this load ≈ 31.4 h.
- BLUETTI AC180: 1,152 Wh, 1,800 W / 2,700 W surge, $499 (checked 2026-10-21). Runtime at this load ≈ 47.1 h.
- Jackery Explorer 1000 v2: 1,070 Wh, 1,500 W / 3,000 W surge, $519 (checked 2026-10-21). Runtime at this load ≈ 43.8 h.
- Anker SOLIX C1000 Gen 2: 1,024 Wh, 2,000 W / 3,000 W surge, $549.99 (checked 2026-10-21). Runtime at this load ≈ 41.9 h.
- Anker SOLIX C1000: 1,056 Wh, 1,800 W / 2,400 W surge, $599.99 (checked 2026-10-21). Runtime at this load ≈ 43.2 h.
- EcoFlow DELTA 3: 1,024 Wh, 1,800 W / 3,600 W surge, $629 (checked 2026-10-21). Runtime at this load ≈ 41.9 h.
- EcoFlow DELTA 3 Plus: 1,024 Wh, 1,800 W / 3,600 W surge, $719 (checked 2026-10-21). Runtime at this load ≈ 41.9 h.
- Jackery Explorer 2000 v2: 2,042 Wh, 2,200 W / 4,400 W surge, $899 (checked 2026-10-21). Runtime at this load ≈ 83.5 h.
- Anker SOLIX C2000 Gen 2: 2,048 Wh, 2,400 W / 4,000 W surge, $999.99 (checked 2026-10-21). Runtime at this load ≈ 83.8 h.
- EcoFlow DELTA 2 Max: 2,048 Wh, 2,400 W / 4,800 W surge, $1,049 (checked 2026-10-21). Runtime at this load ≈ 83.8 h.
- Anker SOLIX F3800: 3,840 Wh, 6,000 W / 9,000 W surge, $2,199.99 (checked 2026-10-21). Runtime at this load ≈ 157.1 h.
- EcoFlow DELTA Pro 3: 4,096 Wh, 4,000 W / 8,000 W surge, $2,799 (checked 2026-10-21). Runtime at this load ≈ 167.6 h.
Closest that fall short:
- Jackery Explorer 300 v2: 288 Wh, 300 W / 600 W surge, $279 (checked 2026-10-21). Runtime at this load ≈ 11.8 h. Short on capacity.
- EcoFlow RIVER 3 Plus: 286 Wh, 600 W / 1,200 W surge, $299 (checked 2026-10-21). Runtime at this load ≈ 11.7 h. Short on capacity.
Notes
- DC is more efficient. ResMed sells a DC/DC converter for the AirSense 11. Running from a 12 V or 24 V source skips the inverter loss. The calculator's DC setting models that at 90% efficiency (an assumption).
- Your settings matter. Pressure, humidity level and heated tubing all change the draw. Check your own machine's manual.
- This is power sizing only, not medical advice. Ask your equipment supplier about backup power if you depend on therapy.
Open this in the calculator. Change the hours, efficiency or days there.
Sources: ResMed AirSense 11 user guide, technical specs (Typical 56.1 W, peak 73.2 W); Champion wattage chart (CPAP (without heat) 30–60 W).