Can the EcoFlow DELTA 3 run a CPAP all night?

Yes. The EcoFlow DELTA 3 delivers 1,800 W continuous and 3,600 W peak; CPAP machine (ResMed AirSense 10 AutoSet) draws about 53 W running. With everything else unplugged, one full charge runs it for roughly 16 h at that draw, or about 26 h of use at the appliance's average draw — about 3.2 days at 8 h a day.

Appliance running draw	53 W source (ResMed 'Typical power consumption: 53W (57VA)', 90 W power supply unit)
Appliance peak draw	104 W source
Average draw per hour of use	34 W source (ResMed: 34 Wh with HumidAir humidifier (setting 6) + ClimateLineAir heated tube (28 °C), AutoSet 8–15 cm H2O; device only 7 Wh, device + humidifier 22 Wh. ResMed labels the column 'Power Consumed (Watt Hour)'; read here as watt-hours per hour of running)
Continuous output ≥ running draw	Yes 1,800 W source
Peak output ≥ peak draw	Yes 3,600 W source
Usable energy	1,024 Wh × 0.85 = 870 Wh factor: see methodology
Runtime at running draw	16 h
Runtime at average draw (hours of use)	26 h — about 3.2 days at 8 h/day

Appliance running draw

53 W source (ResMed 'Typical power consumption: 53W (57VA)', 90 W power supply unit)

Appliance peak draw

104 W source

Average draw per hour of use

34 W source (ResMed: 34 Wh with HumidAir humidifier (setting 6) + ClimateLineAir heated tube (28 °C), AutoSet 8–15 cm H2O; device only 7 Wh, device + humidifier 22 Wh. ResMed labels the column 'Power Consumed (Watt Hour)'; read here as watt-hours per hour of running)

Continuous output ≥ running draw

Yes 1,800 W source

Peak output ≥ peak draw

Yes 3,600 W source

Usable energy

1,024 Wh × 0.85 = 870 Wh factor: see methodology

Runtime at running draw

16 h

Runtime at average draw (hours of use)

26 h — about 3.2 days at 8 h/day

Why output is not the issue

Both conditions on this page pass with room to spare. The reference CPAP, a ResMed AirSense 10 AutoSet, draws 53 W typical and 104 W peak according to ResMed's user guide. That is about 3 % of the DELTA 3's 1,800 W continuous rating and about 3 % of its 3,600 W surge. The 104 W is ResMed's peak power consumption, not a motor start, but the table still checks it against the station's peak, and it passes. For a CPAP, the question is how many hours of stored energy you have.

Nights per charge

EcoFlow lists 1,024 Wh. With the 0.85 conversion allowance from the site methodology (EcoFlow publishes no factor for this model), about 870 Wh reaches the outlet. The arithmetic is:

nights = 1,024 Wh × 0.85 ÷ (watts × hours per night)

The draw depends heavily on settings. ResMed's power consumption document for Air10 devices gives three figures:

Humidifier and heated tube, 34 Wh per hour (the figure in the table above): 870 ÷ (34 × 8) ≈ 3.2 eight-hour nights. The "26 h — about 3.2 days" in the table is this same figure: 26 hours of use, counted as 8-hour nights.
Humidifier only, 22 Wh per hour: about 4.9 nights.
Device only, 7 Wh per hour: about 15 nights.

The 16 h in the verdict uses ResMed's 53 W typical figure from the user guide. That is a different document from the one above, and the gap between 53 W and 34 Wh per hour is one reason to confirm your own machine's figure with the device manufacturer.

What else changes it

The CPAP's own power supply sits between the outlet and the machine, and the 0.85 allowance is meant to cover that kind of conversion loss. Anything else on the station, such as a phone charger or a lamp, uses the same 870 Wh. EcoFlow rates the cells for 4,000 cycles to 80 % of original capacity, so an older unit gives proportionally fewer nights. The DELTA 3 page this record uses does not list an operating temperature range.

Recharging between nights

EcoFlow gives 0 to 100 % in 56 minutes at its 1,500 W AC input, and up to 500 W of solar. One night at 34 W for 8 hours is 272 Wh, which is about half an hour of the full 500 W solar input. Panels reach their rating only in direct sun, so expect it to take longer. For a station that holds more nights on its own, the EcoFlow DELTA 3 Max works out to about 6.4 nights at 34 W. EcoFlow also lists extra batteries for the DELTA 3, up to 5 kWh in total. The DELTA 3 vs Jackery Explorer 1000 v2 comparison covers a station of the same size.

Frequently asked questions

How many nights will the EcoFlow DELTA 3 run a CPAP?

On the reference machine (ResMed AirSense 10 AutoSet) with humidifier and heated tube, ResMed's power document gives 34 Wh per hour. Eight hours of that is 272 Wh, and 1,024 Wh × 0.85 ÷ 272 Wh ≈ 3.2 nights. Your device and settings may draw more or less; confirm the figure with the device manufacturer.

Does the humidifier change the runtime?

Yes, by a lot. ResMed lists 7 Wh for the device alone, 22 Wh with the humidifier, and 34 Wh with the humidifier plus the heated ClimateLineAir tube (ResMed power consumption document). Which settings you use is a matter for you and the device manufacturer, not this site.

Is 1,800 W more than a CPAP needs?

Far more. ResMed gives 53 W typical and 104 W peak power consumption for the reference machine; the DELTA 3 is rated 1,800 W continuous and 3,600 W surge. For a CPAP the limit is stored energy, not output.

Will the DELTA 3 take over if the power goes out during the night?

EcoFlow lists a UPS switchover of under 10 ms. Whether a particular CPAP keeps running through a switchover of that length is a question for the device manufacturer.