Why the Inogen One G5 Remains One of the Best Portable Oxygen Concentrators
- Matthew Hellyar
- Jul 7
- 11 min read
Living with supplemental oxygen should not mean giving up the parts of life that matter most.
A visit with family, a medical appointment, a quiet afternoon outside or a simple trip to the shops should not feel impossible because your oxygen equipment is too heavy, too complicated or too restrictive.
This is the problem that portable oxygen concentrators were designed to solve.
Among the many devices available, the Inogen One G5 has earned a strong international reputation. It brings together powerful oxygen delivery, low weight, extended battery options and straightforward controls in a machine small enough to carry throughout the day.
For many suitable oxygen users, it offers something that cannot be measured only in kilograms, settings or battery hours.
It offers greater freedom.
But no oxygen machine is right for every patient. The best portable oxygen concentrator is always the one that safely meets your prescribed needs. In this guide, we look carefully at what makes the Inogen G5 such a respected device, how it works and what patients should consider before choosing one.
What is the Inogen One G5?
The Inogen One G5 is a portable oxygen concentrator designed for people who require supplemental oxygen while remaining mobile.
Unlike a traditional oxygen cylinder, which stores a limited supply of compressed oxygen, a concentrator draws in air from the surrounding environment. It filters out most of the nitrogen and delivers concentrated oxygen to the patient through a nasal cannula.
Because it produces oxygen from the surrounding air, the machine does not need to be returned for oxygen refills. It can operate from a rechargeable battery, household electricity or a compatible vehicle power source.
The G5 provides oxygen using pulse-dose technology. This means that it senses the beginning of a breath and delivers a measured pulse of oxygen as the patient inhales.
It is important to understand that pulse-dose oxygen is different from continuous-flow oxygen. A pulse setting is not directly equal to the same number of litres per minute on a continuous-flow machine. The appropriate device and setting must therefore be based on the patient’s prescription and clinical assessment.
Why is the Inogen G5 considered one of the best portable oxygen concentrators?
There is no single portable oxygen concentrator that is best for every person. Patients have different prescriptions, breathing patterns, mobility needs and daily routines.
The Inogen G5 stands out because it achieves an unusually strong balance between portability and oxygen-production capacity.
It weighs approximately 2.1 kilograms with its single battery, provides six pulse-dose settings and can deliver up to approximately 1,260 millilitres of oxygen per minute. With an extended battery, the manufacturer reports operating time of up to approximately 13 hours on setting 1 under specified conditions.
These specifications matter because smaller devices often require compromises. A very light concentrator may provide fewer settings or a lower oxygen output. A more powerful machine may be considerably heavier.
The G5 was designed to provide meaningful oxygen capability while remaining compact enough for everyday mobility.
That balance is at the heart of its reputation.
Lightweight enough to become part of everyday life
A portable oxygen machine should feel portable in the real world, not only on a product brochure.
The Inogen G5 weighs approximately 4.7 pounds, or about 2.1 kilograms, with its single battery. It can be carried in a purpose-designed shoulder bag and is compact enough to accompany patients to appointments, family gatherings and everyday activities.
For someone who has previously relied on heavier cylinders or a stationary concentrator, this can make a meaningful difference.
It may mean walking from the car to a consultation without pulling a large oxygen system. It may mean sitting outside without planning the day around the nearest wall socket. It may mean visiting family with a machine that can remain quietly beside you rather than becoming the centre of the room.
Portability does not remove the need for oxygen. It changes how oxygen fits into a person’s life.
That distinction matters.
Six settings provide greater flexibility
The Inogen G5 offers pulse-dose settings from 1 to 6. Its maximum stated oxygen-production capacity is approximately 1,260 millilitres per minute.
The availability of six settings gives healthcare professionals a broader range in which to assess an appropriate pulse-dose setting for a suitable patient.
However, the numbers must be understood correctly.
A setting of 2 on the Inogen G5 does not necessarily mean that the patient is receiving two litres of continuous oxygen per minute. Pulse-dose machines deliver measured quantities of oxygen during inhalation, while continuous-flow systems deliver oxygen throughout the breathing cycle.
The setting numbers on different portable concentrators are also not necessarily equivalent to one another.
This is why patients should never choose a setting based only on a previous machine, advice from another oxygen user or a number found online.
The correct setting should be established according to the prescription and, where appropriate, assessed while the patient is resting and moving. The American Thoracic Society advises patients to have their oxygen levels evaluated while using a portable concentrator to confirm that the system supplies enough oxygen during rest and activity.
Battery life that supports longer days
Battery life is one of the most important considerations when choosing a portable oxygen concentrator.
A lightweight machine is far less useful when the patient cannot remain away from a power outlet for a reasonable period.
The Inogen G5 can be used with either a single or extended battery. With the extended battery, Inogen reports battery life of up to approximately 13 hours on setting 1. Actual battery duration will vary according to the selected setting, breathing rate, battery condition, operating environment and how the machine is used.
Higher settings generally use more battery power, which means the maximum advertised duration should not be treated as a promise for every patient.
Even so, the extended battery option can make the G5 particularly useful for longer days away from home.
This may include:
Attending medical appointments
Visiting friends or family
Going to a place of worship
Travelling by car
Spending time outdoors
Managing several activities without returning home to recharge
Patients should always begin longer outings with charged batteries and an appropriate backup plan. Battery life should be planned around the patient’s actual prescribed setting rather than the maximum figure shown in marketing material.
Quiet enough to remain in the background
Oxygen therapy is part of a patient’s healthcare, but it does not need to dominate every interaction.
The Inogen G5 was designed to operate quietly, allowing it to remain relatively discreet during conversations and ordinary daily activities.
This can be especially important in quiet environments. A noisy machine can make patients feel self-conscious, interfere with conversation or draw unwanted attention.
A quieter portable concentrator helps oxygen therapy become part of the background.
The patient can focus on the appointment, the conversation or the family gathering rather than constantly thinking about the equipment beside them.
This sense of normality is one of the less measurable but most valuable qualities of a well-designed portable oxygen system.
Straightforward controls inspire confidence
Medical equipment should be safe and capable, but it should also be understandable.
The G5 has a clear display and simple controls that show the selected setting, remaining battery information and device notifications. It is also Bluetooth-enabled for use with the Inogen Connect application where that functionality is supported.
For patients and family members, simple controls can reduce anxiety.
There should be no uncertainty about whether the device is operating, how much battery remains or which prescribed setting has been selected.
Proper setup and education remain essential. Before using the machine independently, a patient should understand:
How to turn it on and off
How to confirm the prescribed setting
How to connect and position the nasal cannula
How to recognise alarms
How to charge and change the battery
How to clean and care for the equipment
Who to contact when something does not seem right
Good technology becomes more valuable when it is supported by clear patient education.
Flexible power options for home and travel
The Inogen G5 can operate from its rechargeable battery, an AC power supply or a compatible DC vehicle power source.
This gives patients several ways to keep the machine operating or charging throughout the day.
At home, it can be connected to household power while preserving battery capacity. In a compatible vehicle, it can be powered through the appropriate DC cable. Away from external power, it can operate from its rechargeable battery.
This flexibility makes the G5 suitable for a variety of routines, but careful planning is still important.
Before a longer journey, patients should confirm that:
Batteries are fully charged
Charging cables are packed
The vehicle power connection is compatible
The expected battery duration is sufficient for the prescribed setting
A backup oxygen plan is available where clinically required
Portable oxygen provides greater independence, but safe independence still depends on preparation.
Can the Inogen G5 be used for travel?
The G5’s compact size, battery operation and carrying options make it well suited to travel and extended periods away from home.
Car travel is generally easier because the machine can operate using a compatible vehicle power supply while batteries are reserved or charged.
Air travel requires additional preparation.
Airlines may have their own requirements regarding approved portable oxygen concentrators, battery quantities, battery storage and medical documentation. Patients should contact the airline well before departure rather than arriving at the airport without prior approval.
The prescribing doctor may also need to provide documentation confirming the oxygen requirement.
A sensible travel plan should include enough battery capacity for the journey and possible delays, as well as an understanding of how oxygen will be provided at the destination.
Who may benefit from an Inogen G5?
The Inogen G5 may be a good option for a patient who:
Has a prescription for supplemental oxygen
Is clinically suitable for pulse-dose delivery
Wants a lighter alternative for leaving home
Requires a broader range of pulse settings
Needs longer battery options
Wants a portable system for appointments, travel or daily activities
Has been assessed successfully on the device
The diagnosis alone does not determine whether the G5 is suitable.
Two people with the same lung condition may require very different oxygen delivery systems. One patient may maintain an appropriate oxygen level using pulse dose, while another may require continuous flow.
Breathing pattern, activity level, oxygen requirement and the ability to trigger the machine all need to be considered.
When might the Inogen G5 not be appropriate?
The Inogen G5 is a pulse-dose concentrator. It does not provide continuous-flow oxygen.
It may therefore be unsuitable for patients who:
Have specifically been prescribed continuous-flow oxygen
Require more oxygen than the machine can provide
Cannot reliably trigger pulse delivery
Experience inadequate oxygen levels while walking or exercising with the device
Require oxygen during sleep without being assessed for pulse-dose use
Have clinical needs requiring a different oxygen system
This does not mean there is anything wrong with the machine. It simply means that oxygen equipment must be matched to the patient.
A smaller, lighter machine is not automatically a better machine when it cannot meet the prescribed need.
The best portable oxygen concentrator is the one that supports both mobility and clinical safety.
Is the Inogen G5 still a good portable oxygen concentrator?
The Inogen One G5 is an established model with a long history of international use. Inogen’s international website now identifies it as a discontinued model that has been succeeded by the Inogen Rove 6. The G5 nevertheless remains available through selected providers and continues to be supported with compatible parts and accessories.
This is important information for anyone considering a purchase or rental.
Patients should ask their oxygen provider about:
Current device availability
Whether the machine is new or pre-owned
Warranty arrangements
Battery condition and replacement
Servicing and technical support
Availability of replacement columns and accessories
What happens if the device requires repair
A quality oxygen provider should be willing to answer these questions clearly.
The value of a portable concentrator does not depend only on how it performs on the first day. It also depends on the support available throughout its use.
Why the provider matters as much as the machine
Portable oxygen should never be treated like an ordinary consumer appliance.
It is part of a prescribed healthcare plan.
A machine can have excellent specifications and still be the wrong solution when it is supplied without proper assessment, setup or ongoing support.
At Respocare, our responsibility extends beyond delivering equipment. We help patients and families understand the oxygen solution they are receiving and how it should fit into their daily lives.
That includes considering the prescription, the required oxygen-delivery method, battery needs, mobility goals and the support that may be needed after delivery.
Respocare provides portable oxygen options in South Africa, including the Inogen G5, together with patient support and guidance.
For us, an oxygen delivery is a clinical event.
A patient should know how to operate the machine, what the alarms mean, how to manage the batteries and who to contact when help is needed.
Trust is not created by selling a well-known machine.
It is created by remaining available after the machine has been delivered.
So, is the Inogen G5 the best portable oxygen concentrator?
For many suitable pulse-dose oxygen users, the Inogen G5 remains one of the best and most capable portable oxygen concentrators available.
Its reputation is built on a strong combination of features:
A weight of approximately 2.1 kilograms with the single battery
Six pulse-dose settings
Oxygen production of up to approximately 1,260 millilitres per minute
An extended battery option providing up to approximately 13 hours on setting 1
Quiet operation
Straightforward controls
Flexible charging and power options
An established history of international use
Yet the honest answer is that no portable oxygen concentrator is the best for every patient.
The best machine is the one that matches your prescription, provides sufficient oxygen during your normal activities and is supported by a provider you can trust.
When the Inogen G5 is clinically appropriate, its greatest achievement is not simply that it is small, powerful or lightweight.
It is that oxygen can travel with you more easily.
It can accompany you to the people, places and moments that make life feel like your own.
Frequently asked questions about the Inogen G5
Is the Inogen G5 a continuous-flow oxygen concentrator?
No. The Inogen G5 provides pulse-dose oxygen. It detects inhalation and delivers a measured pulse of oxygen at the beginning of the breath.
Does an Inogen setting of 2 equal two litres per minute?
No. A pulse-dose setting is not directly equivalent to continuous-flow litres per minute. The prescribed setting should be confirmed by a qualified healthcare professional.
How much does the Inogen G5 weigh?
The machine weighs approximately 2.1 kilograms with its single battery.
How long does the Inogen G5 battery last?
With an extended battery, Inogen reports up to approximately 13 hours on setting 1 under specified conditions. Actual duration depends on the selected setting, breathing rate, battery condition and operating environment.
Can the Inogen G5 be used while sleeping?
It should only be used during sleep when this has been assessed and approved for the individual patient. Some people may not trigger pulse-dose delivery consistently while asleep.
Can the Inogen G5 be used in a car?
The device can be operated using a compatible DC vehicle power supply. Patients should still travel with charged batteries and follow the guidance provided by their oxygen supplier.
Can I rent an Inogen G5 in South Africa?
Respocare provides portable oxygen rental services in South Africa. Device availability, rental periods, battery packages and suitability should be confirmed directly with the Respocare team.
How do I know whether the Inogen G5 is suitable for me?
The first step is to review your oxygen prescription and clinical requirements. Your oxygen level may need to be assessed while you are resting and active with the device to confirm that it meets your needs.
Speak to Respocare about portable oxygen
Choosing a portable oxygen concentrator is an important decision.
Our team can help you understand the available options, the differences between pulse-dose and continuous-flow oxygen, and whether the Inogen G5 is appropriate for your prescribed therapy.
Contact Respocare to discuss portable oxygen rental or purchase options in South Africa.
Oxygen should support your life—not place it on hold.
Medical notice: Supplemental oxygen is a prescribed medical therapy. Do not change your oxygen equipment, prescribed setting or treatment plan without guidance from your treating healthcare professional.
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