What size generator for cpap machine?
Check, uncheck or adjust the typical device list below — watts, startup surge and battery size update instantly. Numbers come from U.S. DOE, ENERGY STAR and manufacturer spec sheets, not marketing copy.
1. Check what you need to power
Refrigeration & Freezers
Kitchen
Heating, Cooling & Fans
Water & Pumps
Laundry & Cleaning
Electronics & Office
- 1
Medical Devices
- 1
Power Tools & Outdoor
Lighting
- 1
2. Your sizing
⚠️ For medical devices (CPAP, oxygen concentrator) check the manufacturer's inverter waveform requirement (usually pure sine wave) and verify with your equipment supplier. Verify nameplate watts and starting amps before buying; consult a licensed electrician for fixed wiring.
Assumptions: daily hours per device follow DOE / ENERGY STAR duty cycles; capacity adds a 25% margin. Check your appliance nameplates — actual draw varies by model.
3. Best matches from our 6-brand database
- Bluetti AC70~$359
- rated 1,000W covers your 90W continuous load
- surge 1,500W covers your 92W start peak
- 1.4 days of your typical daily use (768Wh / 553Wh)
- EcoFlow DELTA 3~$599
- rated 1,800W covers your 90W continuous load
- surge 3,600W covers your 92W start peak
- 1.9 days of your typical daily use (1,024Wh / 553Wh)
- Jackery Explorer 1000 v2~$519
- rated 1,500W covers your 90W continuous load
- surge 3,000W covers your 92W start peak
- 1.9 days of your typical daily use (1,070Wh / 553Wh)
Static answer (crawlable summary)
Typical device list: CPAP Machine (ResMed AirSense 11, with humidifier)×1, Phone / Smartphone Charger×1, LED Bulb (60W equivalent)×1.
Estimated from: Mfr spec: ResMed (AS11 user guide + battery guide) · Unbound Solar Power Table (secondary) · Energy Star Certified Products (bulbs) — some household values are cross-checked class estimates (not single-model nameplates); check your own appliance nameplate before buying.
| Continuous load | 75 W |
|---|---|
| Startup peak | 92 W (driven by 1× CPAP Machine (ResMed AirSense 11, with humidifier)) |
| Daily energy use | 553 Wh |
| Recommended capacity | 700 Wh (25% margin included) |
| Minimum inverter | 90 W continuous |
Frequently asked questions
What size generator for cpap machine?
For a typical setup (CPAP Machine (ResMed AirSense 11, with humidifier), Phone / Smartphone Charger and LED Bulb (60W equivalent)), you need at least 75W of continuous power. The single biggest moment is startup: when 1× cpap machine (resmed airsense 11, with humidifier) kicks on, the momentary draw peaks at 92W. For a full day of runtime we recommend at least 700Wh of battery capacity (your devices use about 553Wh per day, plus a 25% margin for a full day of use).
Which power stations can handle this?
Based on published specs, Bluetti AC70, EcoFlow DELTA 3, Jackery Explorer 1000 v2 cover the 92W startup peak and deliver 1.4 days / 1.9 days / 1.9 days of typical daily use. Check the comparison cards above for the full numbers.
Why is the startup surge higher than the running watts?
Motor-driven devices (fridge compressors, well pumps, air conditioners) draw 2-5× their running power for a split second at startup — measured as locked-rotor amps (LRA). On this page the biggest spike comes from the CPAP Machine (ResMed AirSense 11, with humidifier): a station that only meets the running load will trip or stall when it starts. Data sources: U.S. DOE Energy Saver, ENERGY STAR certified products, manufacturer spec sheets.