Best Solar Generators for Medical Devices: CPAP, Oxygen Concentrators, and More
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When the power goes out and you depend on medical equipment, runtime estimates aren't theoretical — they're the difference between a manageable night and a medical emergency. The EcoFlow DELTA 2 is the best solar generator for most medical device users: 1024Wh handles a CPAP machine through the night, insulin coolers for two-plus days, and nebulizer treatments multiple times. If you run an oxygen concentrator, you need to read further — the math changes significantly.
This guide covers real wattage draws for specific medical devices, calculates actual runtime on each recommended unit, and flags the scenarios where you genuinely need to spend more.
Medical Device Wattage Reference
| Device | Wattage Range | Notes |
|---|---|---|
| CPAP (no humidifier) | 30-60W | ResMed AirSense 10: ~30W typical |
| CPAP (with humidifier) | 70-120W | Adds 40-60W depending on humidity setting |
| BiPAP | 50-100W | Higher pressure settings draw more |
| Oxygen concentrator (portable) | 80-150W | Philips SimplyFlo: ~95W |
| Oxygen concentrator (home unit) | 150-600W | Invacare Platinum: ~350W; DeVilbiss 10L: ~600W |
| Nebulizer | 50-300W | Compressor type: 100-150W typical |
| Insulin cooler/refrigerator | 15-45W | Averaging ~20W continuous |
| Mobility scooter charger | 100-300W | Check manufacturer spec — varies widely |
| Infusion pump | 10-30W | Most run on internal battery — solar charges the backup |
Our Top Picks at a Glance
| Product | Capacity | Output | Best Medical Use | Price |
|---|---|---|---|---|
| EcoFlow DELTA 2 | 1024Wh | 1800W (2700W) | CPAP, insulin, nebulizer | ~$999 |
| EcoFlow DELTA Pro | 3600Wh | 3600W (7200W) | Home oxygen concentrators | ~$2,699 |
| EcoFlow RIVER 2 Pro | 768Wh | 800W (1600W) | Travel CPAP, portable O2 | ~$499 |
| Jackery Explorer 1000 Plus | 1264Wh | 2000W (4000W) | CPAP + insulin combo | ~$999 |
Best for CPAP, Insulin, and Nebulizer — EcoFlow DELTA 2
For the most common medical device scenario — CPAP overnight plus insulin refrigeration plus occasional nebulizer treatments — the DELTA 2 delivers the right balance of capacity and cost. At $999 (often on sale for $749), 1024Wh handles the load math comfortably.
- Capacity: 1024Wh LFP
- Output: 1800W continuous, 2700W X-Boost
- Solar input: 500W max
- Weight: 12kg
CPAP runtime (no humidifier, 40W average): 1024 × 0.85 ÷ 40 = 21.8 hours. Two full nights.
CPAP runtime (with humidifier, 90W average): 1024 × 0.85 ÷ 90 = 9.7 hours. One night, with some margin.
Insulin cooler (20W continuous) + CPAP no humidifier (40W): Combined 60W. 1024 × 0.85 ÷ 60 = 14.5 hours. Overnight plus some buffer.
Nebulizer treatments (120W for 15 min each, 4x daily): 4 × 0.25 hr × 120W = 120Wh/day just for nebulizer. Combined with CPAP and insulin cooler, total daily draw is roughly 200-250Wh — well within the 1024Wh capacity for a full day and night.
The DELTA 2 is also expandable to 3072Wh if your medical needs grow or you want more buffer during extended outages. See our full EcoFlow DELTA 2 review for detailed performance data.
Check price on AmazonBest for Home Oxygen Concentrators — EcoFlow DELTA Pro
Home oxygen concentrators are the hardest medical load to power. A mid-range unit like the Invacare Platinum draws 350W continuously. On a 1024Wh unit, that's 1024 × 0.85 ÷ 350 = 2.5 hours. That's not overnight-viable on small units.
For meaningful overnight coverage with a 350W concentrator, you need at minimum 2048Wh. For comfortable 8-hour coverage with margin: 350W × 8 hr ÷ 0.85 = 3,294Wh required. The DELTA Pro at 3600Wh provides exactly this, with a little headroom.
- Capacity: 3600Wh LFP
- Output: 3600W continuous, 7200W surge
- Solar input: 1600W max
- Runtime on 350W concentrator: 3600 × 0.85 ÷ 350 = 8.7 hours
- Runtime on 600W concentrator: 3600 × 0.85 ÷ 600 = 5.1 hours
For the 600W concentrator (DeVilbiss 10L and similar), even the DELTA Pro provides only 5 hours. In this scenario, you need the DELTA Pro plus expansion batteries, or the EcoFlow DELTA Pro Ultra at 6144Wh which provides 8.7 hours on the 600W load. These are expensive but the alternative — running out of oxygen during an outage — is not acceptable.
If you have a home oxygen concentrator, confirm the exact wattage from the manufacturer's spec sheet before purchasing. Do not rely on category estimates.
Check price on AmazonBest Travel Unit for CPAP — EcoFlow RIVER 2 Pro
The RIVER 2 Pro at 768Wh and 7.8kg is the best travel companion for CPAP users. It covers one full night of CPAP use with humidifier (768 × 0.85 ÷ 90 = 7.3 hours) or two nights without (768 × 0.85 ÷ 40 = 16.3 hours). It weighs 7.8kg, fits in most large carry-on bags, and charges to 80% in under an hour via AC.
- Capacity: 768Wh LFP
- Output: 800W (1600W X-Boost)
- Solar input: 220W max
- Weight: 7.8kg
- Price: ~$499
Note on airline travel: at 768Wh, this unit requires airline approval for cargo hold travel and cannot travel in the cabin. No portable power station with more than 160Wh can travel in the cabin under IATA regulations, regardless of airline. Plan ahead and get written airline approval before your flight. Read our dedicated CPAP solar generator guide for travel-specific details.
Check price on AmazonBest CPAP Plus Insulin Combo — Jackery Explorer 1000 Plus
The Jackery 1000 Plus at 1264Wh slightly outpaces the DELTA 2 on raw capacity at the same $999 price point, making it a strong alternative for users who want the absolute maximum runtime at the ~$1,000 budget.
- Capacity: 1264Wh LFP
- Output: 2000W (4000W surge)
- Solar input: 400W max
- Weight: 14.1kg
- Price: ~$999
CPAP (no humidifier) + insulin cooler (40W + 20W = 60W total): 1264 × 0.85 ÷ 60 = 17.9 hours. Nearly two full nights combined.
The Jackery 1000 Plus solar input (400W) is lower than the DELTA 2's 500W, which matters if you rely on daily solar recharge during an extended outage. The DELTA 2 also has the X-Boost technology for higher-wattage appliances. For pure medical device runtime, the 1000 Plus has a slight edge. See our Jackery 1000 Plus review for full test results.
Check price on AmazonWhat to Look For in a Medical Device Generator
Know Your Exact Wattage
Medical device wattage varies significantly by model. A CPAP at 30W and a CPAP at 80W with full humidification will have very different runtimes. Pull the spec sheet for your specific device model and use the formula: capacity × 0.85 ÷ watts = hours. Don't rely on general ranges for life-dependent equipment.
Clean Sine Wave Output
All units on this list use pure sine wave inverters. Medical devices — especially CPAP machines and infusion pumps — require pure sine wave power. Modified sine wave units (uncommon in modern solar generators but still sold) can damage motors and electronics in medical equipment and should be avoided entirely.
Test Before an Outage
Run your full setup — all medical devices at typical settings — from the solar generator for a complete night before you depend on it. Confirm that surge draw at device startup doesn't trip a low-wattage unit. The time to discover problems is during a dry run, not during a storm.
Have a Backup Plan
No solar generator is 100% reliable. For life-critical devices, register with your utility as a medical baseline customer (many utilities prioritize power restoration for registered medical households), contact your local fire department or emergency management office about medical needs registries, and always have a written emergency plan for device failure.
Frequently Asked Questions
How long will a solar generator run a CPAP machine?
Without a humidifier (30-50W average), a 1024Wh unit like the EcoFlow DELTA 2 runs a CPAP for 17-29 hours — multiple nights. With a humidifier (80-120W), runtime drops to 7-10 hours per charge. A 768Wh unit like the RIVER 2 Pro provides 6-16 hours depending on humidification.
Can a solar generator run an oxygen concentrator?
Yes, but you need large capacity. A home concentrator drawing 350W needs 3,294Wh for 8 hours of runtime at 85% efficiency. The EcoFlow DELTA Pro at 3600Wh is the minimum viable unit for overnight coverage. A 600W concentrator (DeVilbiss 10L) requires 6144Wh for an 8-hour night.
Is it safe to run medical devices on a solar generator?
Yes, provided the unit uses a pure sine wave inverter. All major brands (EcoFlow, Jackery, Bluetti) produce clean sine wave output equivalent to grid power. Medical devices should never be run on modified sine wave inverters. Always confirm your unit's inverter type before connecting medical equipment.
What size solar generator do I need for a CPAP and mini fridge?
At 50W CPAP plus 100W fridge average draw, combined load is 150W. For 10 hours: 150W × 10 ÷ 0.85 = 1,765Wh needed. The EcoFlow DELTA 2 at 1024Wh isn't quite enough for 10 hours; step up to a 2048Wh unit like the DELTA Max 3 or Jackery 2000 Plus for comfortable overnight coverage.
Can I take a solar generator on a plane for medical equipment?
Units over 160Wh cannot travel in the aircraft cabin under IATA regulations — this includes the RIVER 2 Pro (768Wh) and all larger units. They require airline approval for cargo transport. Contact your airline directly for medical device battery exemptions. Small units under 100Wh can typically travel in carry-on bags.
Does EcoFlow DELTA 2 work with CPAP machines?
Yes. The DELTA 2 outputs pure sine wave AC power at 1800W, well above any CPAP's 30-120W draw. A CPAP without humidifier runs for roughly 21 hours on a full DELTA 2 charge. With humidifier at 90W average, expect about 9.7 hours — one full night. The DELTA 2 is one of the most popular CPAP backup units available.
How do I calculate how long a solar generator will run my medical device?
Use this formula: (Generator capacity in Wh × 0.85) ÷ device wattage = hours. The 0.85 accounts for inverter and conversion losses. Find your device's exact wattage on the manufacturer spec sheet or the label on the back of the unit — use the running watts, not surge.
What happens if a solar generator runs out during medical device use?
Most medical devices have internal batteries as a last-resort fallback (CPAP machines typically have 2-4 hours of battery). However, you should never rely on this. Set low-battery alerts on your solar generator app (EcoFlow and Jackery both have smartphone apps) and have a backup plan — spare battery pack, cord to a car outlet, or a neighbor with grid power.
