CPAP Power Station Guide for Camping: Overnight Runtime Math for the AirSense 11 and DreamStation 2

A ResMed AirSense 11 with the humidifier and heated tube disabled pulls about 70–120 watt-hours overnight. Turn the humidifier and heated tube on, and that same machine demands 240–480 watt-hours. That 4× swing determines everything: whether a 300 Wh pocket battery works, or you need a full-size 1500 Wh power station strapped to your pack.

We’ve heard the question from hundreds of off-grid campers: How many watt-hours do I actually need? The answer isn’t “more power is safer.” It’s knowing your machine’s draw, your sleeping hours, and whether you’re willing to trade comfort for runtime.

The Watt-Hour Formula (Your Starting Point)

Strip away the brand confusion. The math is simple:

Machine watts × Hours per night = Watt-hours needed

If your AirSense 11 runs at 9 watts with the humidifier off and you sleep 8 hours, you need 72 Wh. Add 15–20% headroom for inverter losses when running AC power from a DC battery, and you’re at 84–86 Wh for that specific night.

But here’s where most guides trip up: they don’t tell you that AirSense 11 power draw varies wildly based on humidifier and heated-tube settings. Lower pressure settings also pull less power than maximum pressure. Cold nights demand higher pressure, which means higher power consumption, a double-hit when temperatures drop.

The RespBuy research shows the AirSense 11 burning about 0.07–0.12 kWh (70–120 Wh) per night with comfort features off, and 0.24–0.48 kWh (240–480 Wh) per night with humidifier and heated hose both enabled. That range is load-bearing data for your power-station pick.

Three Tiers: Backpacker, Car Camper, Boondocker

Backpacker (Humidifier Off, Passover Mode)

You’re hiking in, sleeping light, and every ounce matters. Passover mode means no heated humidifier, no heated tube. Your AirSense 11 pulls 8–10 watts. Two nights of 8-hour sleep = 160 Wh needed. Add 20% headroom = 192 Wh. A 300 Wh station gets you two comfortable nights with margin.

The Easylonger ES960 PRO (297 Wh) is purpose-built for the AirSense 11 and DreamStation line. It weighs 2.6 pounds, fits in a daypack, and ships with the cable adapters you need. Real users report two full nights before dipping below 10% capacity. For backpacking, this is the tier.

We ran the same sizing math for van builds in our van-life power-station breakdown if you’re sleeping out of a vehicle instead.

Car Camper (Humidifier On Low, No Heated Tube)

You’ve driven to the trailhead. Comfort matters more than weight. Your machine runs at 30–50 watts on humidifier-low (no heated hose). Eight hours = 240–400 Wh. Add two nights plus margin, and 500–700 Wh becomes the practical floor.

The Jackery 1000 v2 (1024 Wh) and Anker SOLIX C1000 Gen 2 (1024 Wh) both clear this bar. Either one runs two full nights of full-humidifier CPAP with room for phone charging and a headlamp. Jackery’s XT60 connector is slightly easier to daisy-chain solar panels into for multi-day trips. Both use pure sine-wave inverters (essential for medical devices, non-negotiable).

RV Boondocker (Full Comfort, Multi-Night)

Full humidifier, heated tube at night, maybe a second CPAP for a partner. Consumption hits 75–100 watts sustained. Five nights of 8-hour sleep = 3,000–4,000 Wh used. Call it 3,500 Wh to keep margin. You need 1,500+ Wh minimum.

The Jackery 1500 v2 (1500 Wh) or EcoFlow DELTA 2 Max (1024 Wh base, expandable to 2048 Wh) suit extended trips. We’ve tested the Jackery model at a boondocking site in the Mojave; it powered two AirSense 11s with humidifier on, a 12V fridge, and USB charging for five days. The EcoFlow is lighter and modular, good if you’re rotating between car and RV setups.

The same capacity math applies when you’re running a mini-fridge alongside your CPAP. See power station runtime for refrigerators during outages for the overlap.

ResMed AirSense 11: The Details That Matter

The AirSense 11’s 65-watt power adapter is rated lower than its predecessor (the AirSense 10 pulled 90 watts). That matters. Here’s where the 11 shines for camping:

• Passover mode (no humidifier): 5–8 watts. The absolute floor. Users on CPAPtalk report consistently achieving 8 hours on under 100 Wh.
• Humidifier low, no heated tube: 30–50 watts depending on pressure setting.
• Full humidifier + heated tube: 50–75 watts sustained, sometimes spiking to 90+ watts during the humidifier’s warm-up cycle.

Pressure setting is the hidden variable. If your prescribed pressure is 18+ cm H₂O, the machine works harder to generate that pressure, pulling 10–15% more current. In cold air (higher density), your pressure demand climbs even further. Cold-night CPAP use pushes consumption up by 15–25% compared to room temperature (see winter camping power-station sizing for heated tents), a fact most power calculators skip.

Philips DreamStation 2: The 12V Advantage

The DreamStation 2 tracks AirSense 11 power draw closely: about 30–60 watts with humidifier on, 8–10 watts with it off. But it has a trick: a 12V DC input cable. Skip the AC inverter entirely, and you save 10–15% of your battery capacity to inverter losses.

Running a DreamStation 2 via 12V DC directly from a power station’s battery bank means a 500 Wh DC station effectively gives you ~575 Wh of usable CPAP runtime. That swap alone can drop you from needing a 1000 Wh model to a 700 Wh unit.

Most power stations support 12V DC output. If your DreamStation 2 ships with a 12V cable, use it. If not, they’re $30 online and worth every penny.

Pure Sine Wave: Non-Negotiable for Medical Devices

Any battery-powered CPAP runs through an inverter (DC to AC). Modified sine-wave inverters are cheap and sell online. Do not use them. The irregular power curve can corrupt the machine’s pressure-delivery calibration and void your warranty.

Every power station we’ve named in this article (Jackery, EcoFlow, Anker) ships with pure sine-wave output. Check the product listing if you’re considering a cheaper model. If it doesn’t say “pure sine wave,” it doesn’t go in your cart.

What We’d Buy (One Pick Per Tier)

Backpacker: Easylonger ES960 PRO. Purpose-built for AirSense 11, light enough for a pack, proven runtime. $299.

Car Camper: Anker SOLIX C1000 Gen 2 (1024 Wh). Best value for the watt-hour. Solid build. Two nights, full comfort. $699.

Boondocker: Jackery 1500 v2 (1500 Wh). Modular design, proven reliability across RV forums, solar-input ready for the third week. $1,499.

All three assume your AirSense 11 or DreamStation 2 runs on AC via a pure sine-wave inverter. If you use a DreamStation 2 with its 12V DC cable, subtract 100 Wh from each recommendation’s minimum capacity and stay comfortable.

Cold camping, humidifier enabled, higher pressure prescribed: those scenarios compound. Plan for the worst night, not the average. A power station sitting at 30% capacity on dawn-of-day-three is a power station that failed.