- 350W
- while running, 700W to start
- 8,400Wh
- used over a full day
- 12 of 15
- models we track can run it
- Best to grow into a full nightAnker Solix C2000 Gen 25.0 hr$899.99Check price
- Lowest price for a full nightAnker Solix F38009.3 hr$1,979.99Check price
- Longest runtime, fastest switchoverEcoFlow Delta Pro 39.9 hr$2,799Check price
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Runtime for every model
| Model | Runtime | Capacity | Output | Weight | Price | Per Wh |
|---|---|---|---|---|---|---|
| EcoFlow River 3 | Can't run it | 245Wh | 300W | 7.8 lb | $239 | $0.98 |
| Jackery Explorer 300 v2 | Can't run it | 288Wh | 300W | 8.2 lb | $299 | $1.04 |
| Anker Solix C300 | Can't run it | 288Wh | 300W | 9.1 lb | $249 | $0.86 |
| EcoFlow River 3 Plus | 0.7 hr | 286Wh | 600W | 10.4 lb | $299 | $1.05 |
| Bluetti AC70 | 1.9 hr | 768Wh | 1,000W | 22.5 lb | $359 | $0.47 |
| EcoFlow Delta 3 Plus | 2.5 hr | 1,024Wh | 1,800W | 27.6 lb | $669 | $0.65 |
| Jackery Explorer 1000 v2 | 2.6 hr | 1,070Wh | 1,500W | 23.8 lb | $499 | $0.47 |
| Anker Solix C1000 Gen 2 | 2.5 hr | 1,024Wh | 2,000W | 24.9 lb | $499.99 | $0.49 |
| Bluetti Elite 100 V2 | 2.5 hr | 1,024Wh | 1,800W | 25 lb | $489 | $0.48 |
| EcoFlow Delta 3 Max | 5.0 hr | 2,048Wh | 2,400W | 44.8 lb | $879 | $0.43 |
| Jackery Explorer 2000 v2 | 5.0 hr | 2,042Wh | 2,200W | 39.5 lb | $899 | $0.44 |
| Anker Solix C2000 Gen 2 | 5.0 hr | 2,048Wh | 2,400W | 41.7 lb | $899.99 | $0.44 |
| Bluetti Elite 200 V2 | 5.0 hr | 2,073Wh | 2,600W | 53.4 lb | $899 | $0.43 |
| EcoFlow Delta Pro 3 | 9.9 hr | 4,096Wh | 4,000W | 113.5 lb | $2,799 | $0.68 |
| Anker Solix F3800 | 9.3 hr | 3,840Wh | 6,000W | 132.3 lb | $1,979.99 | $0.52 |
Shaded rows are our picks. Assumed load: A 5-litre home oxygen concentrator pulling 350W nonstop, with a 700W startup surge.
Read this first: a battery is a bridge
A home oxygen concentrator is medical equipment. A portable power station is not a medical backup system, and the runtimes here are arithmetic from published specs, not test results. Use one to bridge a short outage. Do not make it your only plan.
Two steps matter more than any battery:
- Ask your oxygen supplier about backup cylinders, how long they last at your flow rate, and how to switch over to them.
- Tell your electric utility that someone in your home depends on medical equipment, and ask what they offer.
If your doctor has said you cannot go without oxygen, ask the supplier what backup they recommend. This guide is sizing help, not medical advice.
Why it empties a battery so fast
A concentrator pulls in room air and separates out the oxygen. The part doing the work is a compressor, an air pump driven by a motor, and it runs the whole time the machine is on. It does not rest between cycles the way a fridge does. Our numbers assume a 5-litre model pulling 350W nonstop. It is like a tap left running: the size of the tank only decides how soon it is empty.
350W for one hour is 350 watt-hours. A watt-hour is a unit of energy: one watt used for one hour. A concentrator plugs into a household AC outlet, and a battery stores DC, so the station has to convert it. In our math 85% of the battery reaches the machine. A 1,024Wh battery delivers about 870Wh, which is 2.5 hours. A 2,048Wh battery gives 5.0.
What a full night takes
Eight hours at 350W is 2,800Wh at the machine, or roughly 3,300Wh of battery after losses. Only two of the 15 models hold that much: the Anker Solix F3800 at 9.3 hours and the EcoFlow Delta Pro 3 at 9.9. Both weigh more than 110 pounds.
All four 2,000Wh models land at 5.0 hours, and the Bluetti AC70 gives 1.9.
The small units cannot run it at all
The EcoFlow River 3, Jackery Explorer 300 v2 and Anker Solix C300 have 300W outlets. The concentrator asks for 350W, so they shut the outlet off. The EcoFlow River 3 Plus can run it, but only for 0.7 hours, about 42 minutes.
The compressor also needs a short burst to get moving, about 700W in our numbers. That burst is called startup surge. Every model from the River 3 Plus up has a surge rating above it.
Check your own machine’s label
350W is typical, not a promise. The label or the manual lists watts or amps. Multiply amps by 120 to get watts. Some 5-litre models draw less, and 10-litre models draw more. If yours pulls 300W, a 5.0-hour runtime becomes about 5.8 hours.
UPS mode, and portable concentrators
UPS stands for uninterruptible power supply. In that mode the station sits between the wall and the concentrator and takes over when the grid drops. The gap is listed in milliseconds, thousandths of a second: 10 ms for three of the picks and 20 ms for the Anker Solix F3800. Check your manual for what your concentrator does after a brief power cut, and whether it restarts by itself.
A battery-powered portable concentrator is a different, much smaller load. It carries its own battery, and a power station can recharge it. It is not always a substitute for a home unit, so ask your doctor or supplier before relying on one.
The picks in detail
EcoFlow Delta 3 Max
- 5.0 hr
- Home oxygen concentrator
- $879
- $0.43 per Wh
- 44.8 lb
- Weight
5.0 hours at 350W for $879, the lowest price in the 2,000Wh class at $0.43 per watt-hour. Left plugged in between the wall and the concentrator, it takes over in 10 ms when the grid drops, and it refills to 80% in 68 minutes once power is back. Its 4,800W surge rating is far above the concentrator's 700W start. Five hours is not a night, so keep your backup cylinders ready.
What fits
- 5.0 hours at 350W
- 10 ms UPS switchover
- $879, the lowest price in the 2,000Wh class
What does not
- Does not cover an 8-hour night
- Cannot be expanded with extra batteries
EcoFlow's list price is $1,199. The Delta 3 Max Plus is a separate, pricier model.
Anker Solix C2000 Gen 2
- 5.0 hr
- Home oxygen concentrator
- $899.99
- $0.44 per Wh
- 41.7 lb
- Weight
On its own this gives the same 5.0 hours as the EcoFlow, with the same 10 ms switchover. One expansion battery doubles it to 4,096Wh, which by the same math is about 9.9 hours. So you can buy 5 hours now and add a full night later. At $899.99 it costs about $21 more than the EcoFlow, and the expansion battery is a separate purchase.
What fits
- Expandable to 4,096Wh with one expansion battery
- 10 ms UPS switchover
- Full wall recharge in 58 minutes
What does not
- 5.0 hours without the expansion battery
- 41.7 lb before any add-on
Anker's list price is $1,499.99. Anker lists a 9W idle draw, which is low for this size.
Anker Solix F3800
- 9.3 hr
- Home oxygen concentrator
- $1,979.99
- $0.52 per Wh
- 132.3 lb
- Weight
This is the cheapest unit in the table that runs the concentrator through an 8-hour night: 9.3 hours for $1,979.99, or $0.52 per watt-hour. That leaves a little over an hour of margin. Its switchover is 20 ms, slower than the 10 ms of the other picks. At 132.3 lb it is the heaviest model we track, and Anker lists no wall charging time for it.
What fits
- 9.3 hours at 350W, enough for one night
- $819 less than the EcoFlow Delta Pro 3
- Expansion batteries available
What does not
- 20 ms UPS switchover
- 132.3 lb
- No wall charging time listed
Anker's list price is $2,199.99. A newer F3800 Plus is sold alongside it for more.
EcoFlow Delta Pro 3
- 9.9 hr
- Home oxygen concentrator
- $2,799
- $0.68 per Wh
- 113.5 lb
- Weight
9.9 hours at 350W is the longest runtime in the table, and this is the only unit that both covers a full night and lists a 10 ms switchover. It refills to 80% in 50 minutes, which helps when the power returns and then fails again. The cost is steep: $2,799, or $0.68 per watt-hour. It weighs 113.5 lb, with wheels and a pull handle for moving it.
What fits
- 9.9 hours at 350W
- 10 ms UPS switchover
What does not
- $2,799, which is $819 more than the Anker Solix F3800
- 113.5 lb, even with wheels
EcoFlow's list price is $3,699. It has wheels and a pull handle; at 113.5 lb you will need them.
Verdict
For outages of a few hours, buy the EcoFlow Delta 3 Max, or the Anker Solix C2000 Gen 2 if you may add a battery later. To cover a whole night, the choice is the Anker Solix F3800 for $1,979.99 or the EcoFlow Delta Pro 3 for $2,799 with a faster switchover. Skip everything under 2,000Wh. Whatever you buy, keep backup cylinders from your oxygen supplier. A battery runs out, and the outage may not be over when it does.
How these numbers were worked out. Runtime = battery capacity × efficiency ÷ average watts. We use 85% efficiency for AC outlets and 90% for DC and USB ports, because some energy is lost as heat on the way out. A model is marked "can't run it" when the device needs more watts than the outlet gives, or a bigger startup surge than the unit is rated for. Your own device may draw more or less than our assumed load, so treat these as estimates. Prices were checked on 2026-10-04 and change often. Full method
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