Best Solar Generators for CPAP Users (2026)

A standard CPAP machine draws 30–60W without a humidifier and 70–120W with one. At those loads, even a mid-range solar generator gives you multiple nights of uninterrupted sleep. But picking the wrong unit — or miscalculating your specific machine's draw — means waking up at 3am to a dead battery. The EcoFlow DELTA 2 is the best solar generator for most CPAP users: 1024Wh gives you three to four nights without recharging, X-Boost handles any wattage quirks, and the fast 80-minute AC charge means you can top it off from a wall outlet between trips. Here's what you need to know before buying.

CPAP Power Consumption: Know Your Numbers First

Before buying a solar generator for CPAP use, check your specific machine's power draw. It's printed on the label on the bottom of the unit or in the manual. The numbers vary more than most people realize:

• Without humidifier: Most CPAPs draw 30–60W. A ResMed AirSense 10 draws about 30W without humidifier; with humidifier it climbs to 50–70W depending on humidity setting.
• With humidifier: 70–120W is the typical range. A Philips DreamStation at high humidity can hit 100–110W.
• BiPAP machines draw more — typically 40–80W without humidifier, up to 150W with.
• Auto-adjusting (APAP) machines vary by pressure setting throughout the night; plan on average draw, not peak draw, for battery sizing.

Using a conservative middle estimate of 45W average without humidifier and 80W with humidifier, here are the runtime calculations for each unit in this guide:

Unit	Capacity	Runtime (45W, no humidifier)	Runtime (80W, with humidifier)
EcoFlow DELTA 2	1024Wh	~19.3 hrs (~4 nights)	~10.9 hrs (~2 nights)
EcoFlow RIVER 2 Pro	768Wh	~14.5 hrs (~3 nights)	~8.2 hrs (~1.5 nights)
Jackery Explorer 1000 Plus	1264Wh	~23.9 hrs (~5 nights)	~13.4 hrs (~2.5 nights)
Bluetti EB70S	716Wh	~13.5 hrs (~3 nights)	~7.6 hrs (~1.5 nights)

Runtime formula: capacity_Wh × 0.85 ÷ load_watts

Our Top Picks at a Glance

Product	Capacity	Weight	Best For
EcoFlow DELTA 2	1024Wh	26.5 lbs	Best Overall CPAP Unit
EcoFlow RIVER 2 Pro	768Wh	17.2 lbs	Best for Travel
Jackery Explorer 1000 Plus	1264Wh	31.1 lbs	Best for High-Draw BiPAPs
Bluetti EB70S	716Wh	21.4 lbs	Best Budget Option

Best Overall for CPAP — EcoFlow DELTA 2

The DELTA 2 is the right CPAP power station for most people because it covers humidifier users and non-humidifier users both — and it handles multiple nights without recharging. At 45W (no humidifier), you get 19.3 hours: that's four nights of 8-hour sleep on a single charge, with 2.6 hours to spare. At 80W (with humidifier), you get 10.9 hours: two full nights and most of a third.

Key specs:

• 1024Wh LiFePO4, 3,000+ cycles
• 1800W continuous AC / 2700W X-Boost
• 6 AC outlets, USB-C 140W
• 500W max solar input
• Charges 0–80% in 80 minutes via AC
• Weighs 12kg / 26.5 lbs

X-Boost is relevant for CPAP users because some CPAP models have power supplies that the inverter's pure sine wave reads differently than grid power. EcoFlow's inverters produce clean pure sine wave AC, which all CPAP machines require — modified sine wave inverters (found in cheaper units) can damage CPAP motor windings over time. Every unit in this guide produces pure sine wave AC; if you're looking at budget units not in this list, verify that spec before buying.

The 80-minute AC charge matters for camping: if you stop at a rest stop with an outlet or get a hookup at a campsite, you can restore 80% of capacity before bedtime. Check current price on Amazon.

Best for Travel — EcoFlow RIVER 2 Pro

For CPAP users who travel by car or who need something they can easily move from room to room, the RIVER 2 Pro at 17.2 lbs is the right size. Three full nights without a humidifier (14.5 hours at 45W) and one to two nights with (8.2 hours at 80W) covers most travel scenarios where you have some AC access to recharge mid-trip.

Key specs:

• 768Wh LiFePO4, 3,000+ cycles
• 800W continuous AC / 1600W X-Boost
• 3 AC outlets, USB-C 100W
• 220W max solar input
• Charges 0–80% in 70 minutes via AC
• Weighs 7.8kg / 17.2 lbs

The 70-minute charge to 80% is the fastest in this guide, which matters when you're staying somewhere with limited outlet access and need to top off during the day for overnight use. The smaller form factor also means the RIVER 2 Pro fits in a large suitcase or duffle bag alongside a CPAP travel kit, which the DELTA 2 at 26.5 lbs cannot. For camping-specific CPAP use, see our solar generators for camping guide. Check current price on Amazon.

Best for BiPAP and High-Draw Machines — Jackery Explorer 1000 Plus

BiPAP machines draw more power than standard CPAPs — typically 40–80W without humidifier, up to 150W with. For BiPAP users on high pressure settings with a heated humidifier, 768Wh might only deliver one full night. The Jackery Explorer 1000 Plus at 1264Wh adds enough buffer to cover three full nights at 45W or two nights at 80W with room to spare.

Key specs:

• 1264Wh LiFePO4, 4,000+ cycles
• 2000W continuous AC / 4000W surge
• 400W max solar input
• AC charge ~1.8 hours to full
• Weighs 14.1kg / 31.1 lbs

At 31.1 lbs it's at the heavy end for a travel unit, but for stationary use at a cabin or during a home outage, the weight is irrelevant. The 4,000-cycle rating means this unit will outlast your CPAP machine by a wide margin in terms of battery health. Check current price on Amazon.

Best Budget for CPAP — Bluetti EB70S

At 716Wh and around $549, the Bluetti EB70S gets you three nights at 45W (13.5 hours) and about one and a half nights at 80W with humidifier (7.6 hours). For users who only need the generator for a CPAP during camping or occasional outages, the EB70S does the job for less money than the DELTA 2.

Key specs:

• 716Wh LiFePO4, 2,500+ cycles
• 800W continuous AC / 1400W surge
• 4 AC outlets, dual USB-C
• 200W max solar input
• AC charge ~2 hours to full
• Weighs 9.7kg / 21.4 lbs

The 2,500-cycle rating is the lowest of any unit here — still about 6.8 years at one cycle per day — and the 200W solar input means full solar recharge takes about 4 hours with a single 200W panel. For occasional users, neither limitation is a real concern. For daily camping or regular outage scenarios, the RIVER 2 Pro's extra capacity and faster charging at $499 makes more sense. Check current price on Amazon.

Important CPAP Power Considerations

Always Use Pure Sine Wave AC

Every solar generator recommended here produces pure sine wave AC output. This is not optional for CPAP machines — modified sine wave AC can damage the CPAP's internal power supply and motor over repeated use. If you're evaluating any unit not on this list, check the inverter spec explicitly. "Pure sine wave" should be listed in the product specs.

DC CPAP Adapters Save Significant Battery

Many CPAP machines (especially ResMed AirSense and AirMini models) have 12V DC adapter options that bypass the inverter entirely. Running a CPAP on DC instead of AC reduces energy consumption by 15–20% by eliminating inverter conversion losses. The EcoFlow DELTA 2, RIVER 2 Pro, and Jackery 1000 Plus all have 12V DC output ports compatible with CPAP DC adapters. For a machine drawing 45W on AC, the DC draw drops to roughly 37–40W, adding 1–2 extra hours per charge.

Altitude and Pressure Settings Affect Power Draw

CPAP machines working harder at higher pressure settings draw more power. If you camp at altitude and your machine auto-adjusts pressure accordingly, plan for higher-than-average draw. A machine that draws 30W at home may draw 45–50W at 7,000 feet under auto-titrating pressure. Factor in a 30% buffer when sizing your battery for mountainous camping.

Turn Off the Humidifier When Battery Is Critical

If you're running low on charge, turning off the heated humidifier and using a cold passover humidifier (or none) immediately drops power draw from 70–120W to 30–60W. Most CPAP users tolerate this for one night without significant comfort loss. It can mean the difference between waking up with a dead battery and finishing the night.

Our Testing Methodology

All runtime calculations use the formula: capacity_Wh × 0.85 ÷ load_watts. CPAP power draw figures are sourced from manufacturer datasheets and cross-referenced against published third-party watt-meter tests. Individual machine draw varies — verify your specific model's consumption before relying on these estimates for multi-night backcountry trips. For a broader look at portable power options, see our complete portable solar generator guide.