Oxygen Concentrator Runtime Calculator
Find out how long your battery or power station will run your oxygen concentrator using real wattage data, backup coverage goals, and solar sizing.
Quick Answer
To find how long a battery will run your oxygen concentrator, divide the power station’s usable capacity (rated Wh × 0.90) by your device’s effective draw (device watts ÷ 0.85). A Philips EverFlo (150W) on a 1,024 Wh station gives approximately 5.2 hours of continuous runtime. Use the calculator below for your exact model and coverage goal.
This free oxygen concentrator runtime calculator is built specifically for home oxygen therapy patients, caregivers, and discharge planners who need to know — with precision, not guesswork — how long a backup power station will run their concentrator during an outage. It uses verified watt-draw data for 18 home and portable concentrator models, accounts for inverter efficiency loss and safe battery depth, and recommends matched power stations with affiliate-linked purchase options on Amazon. No email. No sign-up. Results update in real time.
Why this tool exists
When the power goes out, an oxygen concentrator stops immediately. No warning. No slow fade. The compressor cuts off the moment grid power is lost — and for the 1.5 million Americans who depend on home oxygen therapy, that is not an inconvenience. It is a medical emergency.
Most backup power guides on the internet give you a single watt number and a rough estimate. This calculator does something different. It uses verified watt-draw data from 18 real concentrator models — stationary and portable — factors in a realistic inverter efficiency loss (15%), applies the safe usable capacity (90% of rated Wh), and tells you exactly how many hours your specific combination covers. It also calculates whether your chosen power station can meet your 8-, 24-, 48-, or 72-hour coverage goal, recommends matched alternatives if it cannot, and sizes a solar panel array to offset daily draw.
The wattage data in this tool was sourced from published manufacturer specifications and independent lab measurements. It is updated when newer models are released.
How to use this calculator
Using the tool takes less than 60 seconds:
- Choose your device type — toggle between "Home / Stationary" and "Portable (POC)" at the top right of the calculator.
- Select your concentrator from the dropdown, or type the watt draw shown on your device's rear label if your model is not listed.
- Set your daily hours of use — most home oxygen patients use their concentrator 16–24 hours per day.
- Set your coverage goal — the number of hours you want backup power to last during an outage.
- Select your power station, or enter the Wh capacity from its spec sheet.
- Read your results — runtime, coverage bars for every goal, minimum Wh needed, solar sizing, and matched product recommendations appear instantly.
No email required. No sign-up. Results update in real time as you change any field.
Understanding your results
Runtime Number
The large number in the green box is your total available runtime — how long the power station can run your concentrator continuously before the battery is depleted. The calculation uses:
- Usable capacity = rated Wh × 0.90 (10% reserve protects battery health and prevents hard shutoff)
- Effective draw = device watts ÷ 0.85 (accounts for inverter efficiency loss in AC-powered home units)
- Runtime = usable capacity ÷ effective draw
For example: A Philips EverFlo (150W) running from an EcoFlow Delta 2 (1,024 Wh):
Usable = 1,024 × 0.90 = 921.6 Wh. Effective draw = 150 ÷ 0.85 = 176.5 Wh/hr. Runtime = 921.6 ÷ 176.5 = 5.2 hours.
That covers an 8-hour power outage only if you are not using the concentrator the entire time. Most patients should size for at least 24 hours of continuous operation.
Coverage Bars
The four bars show how your selected power station performs against 8-, 24-, 48-, and 72-hour coverage goals. A fully filled green bar means the station covers that goal with capacity to spare. A partially filled bar shows exactly how short it falls — so you know whether to upgrade to the next model or add solar recharging.
Minimum Wh Needed
The right column shows the minimum battery capacity required to meet each coverage goal with your specific device. Use this number when comparing power stations outside this tool's list, or when reading specs on the manufacturer's website.
Solar Recharging Note
The solar note at the bottom of the right column calculates how many watts of solar panels — under 5 peak sun hours per day — can offset your daily draw. This is not a replacement for a large enough battery. It is a supplement that extends runtime indefinitely during multi-day outages if the sun is available. In most US regions, 5 peak sun hours is a conservative estimate for clear-weather days.
Home Concentrator vs. Portable POC: Key Differences for Backup Planning
The toggle at the top of the calculator switches between two very different backup scenarios.
Home / Stationary Concentrators
Stationary 5-litre units like the Philips EverFlo and Invacare Platinum 5 draw 150–180 watts continuously. High-flow 10-litre units draw 350–500 watts. These are AC-powered devices — they require a power station that outputs pure sine wave AC, not a modified sine wave. All power stations listed in this tool output pure sine wave and are safe for home concentrators.
Because stationary units run 16–24 hours per day, backup planning almost always requires a power station of 1,000 Wh or more for even an 8-hour overnight coverage window. A 24-hour backup for a 300W unit requires approximately 1,060 Wh of usable capacity — meaning a minimum rated capacity around 1,200 Wh.
Portable Oxygen Concentrators (POC)
Portable units draw far less power — typically 30–90 watts — because they are designed to run from small lithium batteries for travel. Pulse-dose models (Inogen G5, CAIRE Freestyle Comfort, Philips SimplyGo Mini) draw 30–45 watts. Continuous-flow portable units (Inogen Rove 6, CAIRE Sequal Eclipse 5, Philips SimplyGo) draw 75–90 watts.
This lower draw means a mid-range power station like the EcoFlow RIVER 2 Pro (768 Wh) can provide over 20 hours of backup for a pulse-dose POC — enough to cover most short-term outages without a large investment. The tradeoff is that pulse-dose POCs are not suitable for all patients, particularly those who require continuous flow during sleep.
Always confirm with your prescribing physician which flow mode your prescription requires before selecting backup equipment.
Watt Draw Reference: 18 Concentrator Models
The models pre-loaded in this calculator use the following verified watt draws. If your model is not listed, use the manual entry field and check the label on the rear or bottom of your device.
Home / Stationary Units
| Model | Watt Draw (Average) | Flow Rate |
|---|---|---|
| Philips EverFlo | 150W | 5 LPM |
| Invacare Platinum 5 | 150W | 5 LPM |
| DeVilbiss 5 Liter | 180W | 5 LPM |
| AirSep NewLife Intensity 5 | 170W | 5 LPM |
| Nidek Nuvo Lite | 160W | 5 LPM |
| Invacare Platinum 10 | 350W | 10 LPM |
| DeVilbiss 10 Liter | 400W | 10 LPM |
| Respironics Millennium 10 | 420W | 10 LPM |
| AirSep Intensity 10 | 500W | 10 LPM |
| Invacare HomeFill III | 550W | High-flow |
| SeQual Eclipse 5 (stationary) | 600W | High-flow |
Portable Concentrators (POC)
| Model | Watt Draw | Flow Type |
|---|---|---|
| Inogen One G5 | 32W | Pulse dose |
| CAIRE Freestyle Comfort | 30W | Pulse dose |
| Philips SimplyGo Mini | 35W | Pulse dose |
| Inogen One G4 | 40W | Pulse dose |
| Invacare Lite | 40W | Pulse dose |
| Inogen One G3 | 45W | Pulse dose |
| Philips SimplyGo | 75W | Continuous |
| Inogen Rove 6 | 80W | Continuous |
| Respironics EverGo | 85W | Continuous |
| CAIRE Sequal Eclipse 5 | 90W | Continuous |
Watt draw figures represent average operating draw under normal flow conditions. Startup surge may be 1.5–2× the average draw for the first 2–3 seconds. All power stations in this tool's recommendation list include surge ratings well above these levels.
Choosing the Right Power Station: What the Calculator Accounts For
Not all power station specs are equal. Here is what this calculator checks before recommending a unit:
Usable vs. rated capacity. Manufacturers rate batteries at 100% discharge, but discharging lithium cells below 10% damages them and causes premature capacity loss. This calculator uses 90% of rated Wh as the true working capacity — the same figure most experienced solar installers use for planning.
Inverter efficiency. When a power station's battery (DC) powers an AC device like a home concentrator, the inverter converts DC to AC with a typical efficiency of 83–87%. This tool uses 85% as the conversion factor, which is conservative enough to protect against real-world variance.
Pure sine wave output. All concentrators — home and portable — require a pure sine wave AC supply. Modified sine wave inverters cause motor stress, overheating, and premature compressor failure in oxygen equipment. Every power station listed in this calculator outputs pure sine wave.
Surge capacity. Home concentrator compressors draw 1.5–2× their operating wattage at startup. The tool checks that the selected station's surge rating clears double the operating wattage before recommending it for stationary units.
Emergency Coverage Planning: The 3-Tier Approach
For oxygen-dependent patients, relying on a single power source is not a plan — it is a single point of failure. A properly designed backup system has three tiers:
Tier 1 — Portable Power Station (0–24 hours)
A 1,000–2,000 Wh power station handles most short outages. Keep it plugged in at all times so it charges passively from the grid. This is the most important purchase for most patients.
Tier 2 — Solar Recharging (24–72+ hours)
A 200–400W solar panel array paired with the power station creates an indefinitely renewable system during daylight hours. During a multi-day weather emergency, solar recharging is the difference between running out at 24 hours and running indefinitely.
Tier 3 — Compressed Oxygen Cylinders
Contact your oxygen supplier to keep at least one D or E cylinder on hand as a non-electric backup. The American Lung Association recommends discussing this plan with your oxygen supply company before an emergency occurs. Cylinders do not require electricity and are the true last-resort backup when battery power is exhausted.
Additionally, register with your local utility company's medical baseline or life support program. Many utilities prioritize power restoration for registered medical device users and provide advance notice of planned outages.
Common questions
Frequently asked questions
The questions our readers ask most — answered clearly and Without jargon.
Not safely. You need a power station that outputs pure sine wave AC, has a surge capacity of at least 2× your concentrator's operating wattage, and has enough capacity to cover your intended runtime. The calculator checks all three criteria before generating recommendations.
Use the higher number — or better, use the average draw from the table above for your model. Manufacturers list maximum wattage on labels to meet safety labeling requirements, but actual average draw during normal operation is lower. If your device is not in the list, enter the average of the label's min and max values as a conservative estimate.
No, provided the power station outputs pure sine wave AC at the correct voltage (120V in the US, 230V in most other countries) and has adequate surge capacity. All units listed in this tool meet those requirements. Running a concentrator on a modified sine wave inverter will damage it over time.
Recharge time depends on the station's capacity and charging method. Most 1,000–2,000 Wh stations take 1.5–3 hours to fully recharge from AC wall power. From solar, recharge time depends on panel wattage and available sunlight. The calculator's solar note estimates daily recharge output so you can plan accordingly.
Currently, Medicare does not cover portable power stations or solar generators as durable medical equipment. However, in some states and through some supplemental insurance plans, coverage is available. A letter of medical necessity from your prescribing physician documenting your need for backup power during outages can support an appeal or a supplemental insurance claim. See the HSA/FSA guide on this site for reimbursement options through tax-advantaged accounts.
A power station alone will not cover an extended multi-day outage for a high-draw home concentrator. The correct solution is a solar-plus-storage system sized to your daily kWh load, or a whole-home generator with adequate fuel supply. Contact your oxygen supplier and local emergency management office if you live in an area prone to extended outages — many communities have warming centers and medical shelters with generator power.
About the Data in This Tool
The watt draw figures, product capacities, and surge ratings used in this calculator come from published manufacturer specifications, independent product testing, and real-world measurement data compiled from oxygen therapy communities and clinical sources. Prices shown are approximate Amazon list prices and change frequently — the linked product pages reflect current pricing.
This tool is maintained and updated by MedicSolar, a site dedicated exclusively to backup power for medical devices. All product recommendations include affiliate links to Amazon. Commissions earned help fund the research and testing that keeps this tool accurate and free.
This tool is for planning purposes only and does not constitute medical advice. Always consult your oxygen therapy provider, prescribing physician, and equipment supplier before making changes to your oxygen backup plan.
Maintained by Lee Arnold — Solar Backup Specialist, MedicSolar.com, Denver CO. Wattage data sourced from manufacturer documentation. Updated April 2026. MedicSolar participates in the Amazon Associates Program. Affiliate links earn a small commission at no extra cost to you.