Power Outage + CPAP / Oxygen Concentrator: Essential UPS Backup Guide

If you or your partner depends on a CPAP, BiPAP, or a portable oxygen concentrator, a power outage is not just a dark night — it's a night where the device that keeps your sleep safe (or, with oxygen, keeps you safe full-stop) stops working. Storms, grid failures, and local outages hit at unpredictable times. A correctly-sized uninterruptible power supply (UPS) or portable power station is one of the single best safety investments a senior household can make.

This guide walks through how to size a backup for common medical devices, the difference between lithium-ion and lead-acid options, trusted models as of April 2026, and how to register your home on your electric utility's medical priority list.

This article is informational and not medical advice. Talk to your doctor before making health decisions.

A note on what we're covering

• CPAP / BiPAP / APAP — positive airway pressure machines for sleep apnea. Typical power draw: 30–70 watts, occasionally up to 100 W if you're using a heated humidifier at high setting.
• Portable Oxygen Concentrator (POC) — smaller, battery-capable devices like Inogen One G5 or Caire Freestyle. Typical power draw: 80–120 W running.
• Home Oxygen Concentrator (stationary) — larger devices like Philips EverFlo or Invacare Perfecto2. Typical power draw: 300–600 W running.
• Home nebulizer — 30–50 W, used briefly during treatments.
• Feeding pump — 5–10 W.

We're not covering home ventilators for tracheostomy patients — those require medical-grade backup and are beyond the scope of a consumer guide. If you're on a ventilator, work directly with your home medical equipment supplier and power company on a dedicated backup plan.

Step 1 — Know your device's power draw

Flip your device over (or check the sticker near the power port). You'll see something like:

• Input: 12V 3.75A — means it draws up to 45 watts (12 × 3.75).
• Or: 100–240 VAC, 2A max — means up to 240 watts at peak, but rarely anywhere close.

If there's a manual, the manual will give a clearer wattage figure. Your CPAP's actual running wattage is often one-third to one-half of its peak rating.

Common CPAP/BiPAP wattages (verified April 2026):

• ResMed AirSense 11 with heated humidifier off: ~40 W
• ResMed AirSense 11 with humidifier on: ~70–90 W
• Philips Respironics DreamStation 2: ~45 W without humidifier
• Fisher & Paykel SleepStyle: ~50 W

Common home oxygen concentrator wattages:

• Philips EverFlo: ~350 W
• Invacare Perfecto2: ~300 W
• DeVilbiss 5L Compact 525: ~300 W
• Respironics SimplyGo Mini (portable, plugged in): ~75 W

Step 2 — Decide how many hours you need

Think about:

• Longest likely outage in your area. In urban US/UK/AU, typical storm outages are 4–8 hours. Rural areas can be 24 hours or longer.
• Whether you can function without the device for a few hours. CPAP: you can sleep without it for one night, uncomfortably, but it's rarely an emergency. Oxygen: depends entirely on your prescription — some people can go a few hours, some cannot. Talk to your doctor about your specific case.

A safe rule of thumb:

• CPAP only: plan for 8–10 hours of backup (one full night).
• Home oxygen: plan for a minimum 4 hours and have a fallback (POC on battery, call for help, or go to a location with power).

Step 3 — Calculate watt-hours needed

Watt-hours (Wh) is the unit that tells you how long a battery will run a device.

Formula: device watts × hours needed = watt-hours needed.

Examples:

• ResMed AirSense 11, humidifier off, 9 hours: 40 W × 9 = 360 Wh.
• ResMed AirSense 11, humidifier on, 9 hours: 80 W × 9 = 720 Wh.
• Philips EverFlo (home oxygen), 4 hours: 350 W × 4 = 1,400 Wh.
• DreamStation 2, 9 hours: 45 W × 9 = 405 Wh.

Add a 20% safety margin. A 360 Wh need becomes a 430 Wh unit; a 1,400 Wh need becomes a 1,700 Wh unit.

Step 4 — Pick the right technology

Lithium-ion (LiFePO4) portable power stations — strongly recommended for most seniors

These are what everyone should be buying in 2026. They're light, quiet, compatible with all medical devices (pure sine wave output), rechargeable thousands of times, and have clear percentage displays and alarms.

Trusted brands:

• EcoFlow Delta series — Delta 2 (1,024 Wh) and Delta 2 Max (2,048 Wh). Around US$700–1,400.
• Jackery Explorer series — Explorer 1000 v2 (1,070 Wh), Explorer 1500 v2 (1,512 Wh). Around US$700–1,200.
• Bluetti AC series — AC180 (1,152 Wh), AC200L (2,048 Wh). Around US$700–1,500.
• Anker SOLIX C1000 — 1,056 Wh. Around US$699.

Any of these will run a typical CPAP all night with plenty of reserve. For home oxygen, size up to 1,500–2,000 Wh.

Lead-acid UPS — cheaper but limited

Traditional office UPSes (APC Back-UPS, CyberPower CP1500) are cheap ($150–250) but:

• Designed to keep a computer alive for 10 minutes during a blip — not to run a medical device overnight.
• Some use modified-sine-wave output, which can make certain CPAP motors whine or vibrate. Pure sine wave is safer.
• Need replacement batteries every 3–5 years.
• Heavy and give no percentage readout.

Only recommend these if budget is severely constrained and you need a short-term (1–2 hour) safety net.

Specialty CPAP batteries

ResMed, Philips, and others sell branded CPAP batteries (ResMed Power Station II, etc.). These are purpose-built, usually fine, but expensive for the watt-hours you get. A $500 ResMed battery gives you roughly 300 Wh; a $500 EcoFlow Delta 2 gives you 1,024 Wh and also powers other things.

Step 5 — Test your setup before you need it

Once you've bought the unit:

1. Charge it fully (usually 1–2 hours to 80% on a modern lithium unit).
2. Unplug your CPAP from the wall and plug it into the UPS.
3. Run a full night on UPS power. Note what the battery level shows in the morning.
4. If it lasted the full night with 20%+ to spare, you're well-sized.
5. Repeat this test once every 3 months to catch any battery degradation.

For oxygen, don't experiment without your doctor's awareness. Call your oxygen supplier and ask them to validate your backup setup.

Step 6 — Register for medical priority with your utility

Every major US, UK, and Australian electric utility has a medical priority or life support register for customers who depend on electrically-powered medical devices. Registration does three things:

1. Advance notice of planned outages — often 2–3 days' warning before scheduled work.
2. Priority restoration during unplanned outages — medical priority homes go to the front of the repair queue.
3. In extreme weather alerts — sometimes a well-being check if an outage runs long.

US: Call your electric utility's customer service and ask for the "medical equipment customer list" or "critical care list." You'll usually need a signed form from your doctor confirming the medical dependency. There's no extra charge.

UK: Register with your energy supplier's Priority Services Register (free). Information at ofgem.gov.uk.

Australia: Each state has a Life Support Rebate and a Priority Customer Register through your retailer (e.g., AGL, Origin). Registration usually includes a small ongoing electricity rebate to offset your medical device running costs.

Step 7 — A simple outage plan

Write this down, put it on the fridge:

1. At onset of outage: confirm UPS is engaged (the device should have switched over automatically; you'll hear the UPS fan).
2. Check battery percentage every 2 hours.
3. At 30% remaining: decide — do you ride it out, or go somewhere with power (a family member's home, a hotel, a designated "cooling/warming center")?
4. At 15% remaining: leave for a safe location. Take the device, a fresh mask/tubing, and your doctor's contact information.
5. Emergency numbers on the fridge: 911 / 999 / 000, your doctor's after-hours line, your home oxygen supplier, a trusted neighbor.

If you live alone, tell at least one neighbor that you depend on a medical device so they can check on you if the whole block is dark.

Common mistakes to avoid

• Buying a UPS sized in VA instead of Wh. VA ratings mislead on how long a device will actually run. Look for watt-hour (Wh) capacity.
• Using a modified-sine-wave inverter with a CPAP. Many work, but some motors buzz or throttle incorrectly. Buy a pure sine wave inverter.
• Forgetting to charge the UPS. A UPS sitting in a closet discharges over time. Plug it in continuously so it's always ready.
• Stacking extension cords. Plug the UPS directly into a wall outlet and the medical device directly into the UPS. Extension cords add resistance and introduce failure points.
• Not telling your doctor. Your doctor should know you have backup capacity and roughly how much — it may affect prescribing decisions for oxygen flow rates or humidifier use.

If you're traveling

A portable power station in the 500–1,000 Wh range fits in the trunk of a car and keeps a CPAP running for multi-night camping, cabin stays, or travel to areas with unreliable power. EcoFlow Delta 2 and Jackery Explorer 1000 v2 both pass current TSA rules for checked luggage (if under 100 Wh per battery unit) — but almost all 500 Wh+ units exceed that and cannot fly. Check airline-specific rules for carrying larger batteries.

Related reading

• Medicare telehealth 2026 walkthrough
• Best medical alert systems 2026
• Emergency SOS setup for iPhone and Android
• Medicare wearable coverage 2026
• Medicare scams — how to protect yourself

Sources

• American Academy of Sleep Medicine, Power Loss Recommendations for CPAP Users, 2026.
• American Thoracic Society, Home Oxygen Therapy — Patient Safety, 2026.
• ResMed, AirSense 11 Technical Specifications, resmed.com, accessed April 2026.
• Philips Respironics, DreamStation 2 Specifications, usa.philips.com, accessed April 2026.
• Ofgem (UK), Priority Services Register, ofgem.gov.uk, 2026.
• Energy Networks Association (Australia), Life Support Customer Information, 2026.

This article is informational and not medical advice. Talk to your doctor before making health decisions.

✅ Reviewed by Eleanor Shaw — techfor60s editorial desk, last verified 2026-04-18.