CPAP Power: Critical, Non-Negotiable, and Solvable
For CPAP and BiPAP users, power is a medical necessity — not a camping convenience. An unplanned power outage or a camping trip without adequate power planning can mean a night of poor or no sleep, which for sleep apnea patients has real health consequences. The good news: modern CPAP machines are energy-efficient (25–80W depending on settings and humidifier use), and a quality solar generator easily powers one through the night and recharges from solar during the day. This guide covers exactly what you need.
How Much Power Does a CPAP Use?
CPAP power consumption varies significantly by machine and settings:
| CPAP Configuration | Typical Wattage | 8-Hour Wh |
|---|---|---|
| CPAP, no humidifier (pressure 10–12) | 20–35W | 160–280Wh |
| CPAP, no humidifier (pressure 18–20) | 35–55W | 280–440Wh |
| CPAP + heated humidifier (low heat) | 50–80W | 400–640Wh |
| CPAP + heated humidifier (high heat) | 80–120W | 640–960Wh |
| BiPAP (no humidifier) | 30–50W | 240–400Wh |
| ResMed AirSense 11 (avg setting) | 30–45W | 240–360Wh |
The humidifier is the power variable. If you’re using solar power for camping, turning off the humidifier (or setting it to 1) reduces consumption by 50–70%, dramatically extending runtime.
The 12V DC Advantage
Most modern CPAP machines (ResMed, Philips Respironics, 3B Medical) can run directly on 12V DC power — the same voltage as a car battery. Running your CPAP on 12V DC from a solar generator is 15–20% more efficient than running it through an AC inverter, because you avoid the 85–90% inverter efficiency loss.
Look for:
- A solar generator with a regulated 12V output port (many have this as a car/DC port)
- The correct DC adapter for your CPAP machine brand (ResMed uses a specific 24V DC input — check your machine’s requirements)
- Brands like ResMed sell their own DC cable for travel use ($20–35)
The DC cable approach extends effective battery capacity by 15–20% vs running through the AC inverter.
How to Size a Solar Generator for Your CPAP
- Check your CPAP manual for wattage at your typical pressure (or measure with a watt meter)
- Calculate nightly consumption: Wattage × 8 hours = Wh/night
- Add 20% buffer for efficiency losses
- This is your minimum capacity. For camping, add solar recharging to cover each day’s use.
Example: ResMed AirSense 11, pressure 12, no humidifier = 35W. 35W × 8 hours × 1.2 = 336Wh needed. A 500Wh solar generator provides 1.5 nights of power — recharge from solar during the day for continuous camping use.
Best Solar Generators for CPAP Use
1. Jackery Explorer 500 — Best Compact CPAP Solution
Price: $399–499 | Capacity: 518Wh | DC output: 12V/10A | Weight: 13.3 lbs
The Jackery Explorer 500 is purpose-sized for CPAP camping use. 518Wh provides 2 nights of CPAP power (no humidifier) or 1.5 nights with low humidifier. The 12V car port handles DC-direct CPAP connection (with the correct cable for your machine). At 13.3 lbs, it’s portable enough to take camping or to keep bedside for outages. Pair with a 100W SolarSaga panel ($199): sunny-day recharge in 5–6 hours. This setup ($600–700 total) is specifically optimized for CPAP camping. Best for: CPAP users who camp and want a dedicated, right-sized solution.
2. EcoFlow Delta 2 — Best for CPAP + Other Needs
Price: $799–999 | Capacity: 1,024Wh | AC output: 1,800W | Solar: 500W max
The EcoFlow Delta 2 provides 1,024Wh — enough for 3–4 nights of CPAP power (no humidifier) or 2 nights with humidifier. The extra capacity means you’re powering your phone, lights, and other devices alongside the CPAP. The 500W solar input allows full daytime recharge in 2.5–4 hours with appropriate panels. For RVers, campers, and home emergency prep where the CPAP is one of many devices, the Delta 2 is the right all-around unit. Best for: users who want to power CPAP plus other devices without rationing.
3. Bluetti EB3A — Best Budget CPAP Backup
Price: $189–249 | Capacity: 268Wh | AC output: 600W | Weight: 10.1 lbs
The Bluetti EB3A is the smallest capable CPAP backup option. 268Wh provides approximately 1 night of CPAP power (no humidifier, standard pressure). For home power outages where the outage typically resolves within 12–24 hours, the EB3A is sufficient and costs under $250. The 30-minute fast charge from wall power is a standout feature — top it up during the day, use at night. Best for: CPAP users who want affordable outage protection and are comfortable replacing one night at a time.
4. Goal Zero Yeti 1000X — Best for CPAP + Humidifier
Price: $1,299 | Capacity: 983Wh | DC output: Multiple regulated ports | Cycle life: 500 (NMC)
For CPAP users who need to run the humidifier at higher settings, the Yeti 1000X’s 983Wh covers 1.5–2 nights of CPAP + heated humidifier. The regulated 12V DC port provides clean DC power for CPAP use. The Yeti’s build quality is premium. Note: the NMC battery chemistry means 500 cycles before degradation — if you use this daily, expect battery replacement in 1–1.5 years. For emergency-only use, this isn’t a concern. Best for: CPAP + humidifier users who want Goal Zero’s build quality for home backup use.
CPAP on Solar: Practical Tips
- Measure your actual consumption: Buy a Kill-A-Watt meter ($25) or smart plug with energy monitoring. Measure exactly what your machine draws at your typical settings — estimates vary significantly by machine and pressure setting.
- Disable humidifier when camping: The humidifier is typically 40–70% of CPAP power consumption. Turning it off dramatically extends battery life. Many campers sleep comfortably without humidification for 1–3 night trips.
- Use a DC cable: If your machine supports DC input, buy the appropriate cable. Running on 12V DC instead of AC inverter adds 10–20% more effective battery capacity.
- ResMed-specific note: ResMed AirSense machines require 24V DC (not 12V). The ResMed DC/DC converter cable ($20–30) connects to a 12V car port and steps up to the required 24V. Verify for your specific machine model.
- Test before your trip: Run the full night on your solar generator at home before depending on it camping. Verify runtime meets your needs with your specific machine and settings.