CPAP Battery Runtime Calculator

Estimated nights ≈ (station capacity × usable efficiency) ÷ (CPAP watts × hours per night). Enter your machine's own consumption (from its label or power-supply spec), add humidifier/heated-tube draw if used, and the calculator shows Wh needed per night and how many nights each catalog product could realistically cover.

CPAP users planning backup power for travel, camping, or a home power outage — not a substitute for medical advice about therapy continuity.

Not medical advice

This tool calculates estimated battery runtime only. It does not assess therapy adequacy or medical suitability. Always check your CPAP machine’s own rating label or the manufacturer’s power-supply specification for its real power draw, and consult your equipment provider or physician about backup power planning.

Start from an example range

Educational starting points only — every value below is editable. Check your device’s own label for its real consumption.

Average consumption or adapter rating (W)

Heated humidifier active

Heated tube active

Power connection

AC (via inverter)DC direct (12V/24V cable)

A direct DC connection skips inverter conversion losses, so it typically runs more efficiently than AC — this only changes the starting position of the efficiency slider below, which stays fully adjustable.

Hours per night8 h/nightNights without recharge1 nightUsable efficiency: 85%

Assumed usable share of nameplate capacity after inverter and conversion losses.

Reserve headroom: 20%

Extra capacity kept in reserve above the calculated requirement.

Recommended minimum capacity

395 Wh

= (35 W × 8 h × 1 night) ÷ 85% usable × (1 + 20% reserve)

Wh per night: 280 Wh
Wh over 1 night: 280 Wh
Device draw: 35 W

Why your real result may differ

These figures are planning estimates from the inputs and assumptions above — not a lab measurement. Your real result can vary with:

Temperature — cold reduces usable battery capacity; heat can trigger throttling
Battery age and condition — capacity fades gradually with cycles and time
Inverter efficiency — some energy is always lost converting DC to AC
Variable appliance draw — most appliances don't pull a constant wattage
Startup/surge power — a motor's brief startup spike can exceed its running watts
Appliance settings — e.g. humidifier, fan speed, or temperature setting
Conversion losses beyond the modeled efficiency assumption
Real solar conditions — actual panel output is usually well below its rated watts
The safety reserve is a margin for error, not a guarantee

How this is calculated

Recommended Power Stations

Compare your shortlist →

Every product in the catalog is classified against your requirement using the same engine as the Power Calculator: first compatibility (does it meet every hard requirement), then how proportionate it is to your need. Units that fail a hard requirement are shown as Not Suitable with the reason, rather than hidden — and units far larger than you need are labeled Oversized rather than presented as a top pick.

Illustrative image — not an exact product photograph.

Goal Zero

Yeti 700

677 Wh · 600 W rated

Good Fit

≈1.7× your recommended minimum capacity

Not scored

Estimated nights from this unit's own capacity: 2.1 nights

Capacity 677 Wh covers your recommended minimum of 395 Wh.
Rated output 600 W handles your 35 W continuous load.
Surge rating 1,000 W covers the estimated 70 W startup spike.

Check Price on Amazon

Price, availability and current rating are shown on Amazon — PowerMatchLab does not display them because we have not independently verified them. As an Amazon Associate we may earn from qualifying purchases.

Oversized alternatives — larger than you need (30)

These fully meet your requirement but carry much more capacity or output than your calculation needs. They can still make sense for future growth, but they are not the proportionate pick.

Illustrative image — not an exact product photograph.

EcoFlow

RIVER 2 Pro

768 Wh · 800 W rated · 18.2 lb (8.3 kg)

Oversized

≈1.9× your recommended minimum — much more than needed

Fair

Estimated nights from this unit's own capacity: 2.3 nights

Capacity 768 Wh covers your recommended minimum of 395 Wh.
Rated output 800 W handles your 35 W continuous load.
Surge rating 1,600 W covers the estimated 70 W startup spike.

Check Price on Amazon

Independent editorial illustration — not an official product photo.

BLUETTI

AC70

768 Wh · 1,000 W rated · 22.5 lb (10.2 kg)

Oversized

≈1.9× your recommended minimum — much more than needed

Fair

Estimated nights from this unit's own capacity: 2.3 nights

Capacity 768 Wh covers your recommended minimum of 395 Wh.
Rated output 1,000 W handles your 35 W continuous load.
Surge rating 2,000 W covers the estimated 70 W startup spike.

Check Price on Amazon

Illustrative image — not an exact product photograph.

VTOMAN

FlashSpeed 1000

828 Wh · 1,000 W rated · 37.4 lb (17 kg)

Oversized

≈2.1× your recommended minimum — much more than needed

Fair

Estimated nights from this unit's own capacity: 2.5 nights

Capacity 828 Wh covers your recommended minimum of 395 Wh.
Rated output 1,000 W handles your 35 W continuous load.
Surge rating 2,000 W covers the estimated 70 W startup spike.

Check Price on Amazon

Independent editorial illustration of the DJI Power 500 — not an official manufacturer photograph.

Independent editorial illustration — not an official product photo.

DJI

Power 500

512 Wh · 1,000 W rated · 16.1 lb (7.3 kg)

Oversized

≈1.3× your recommended minimum — much more than needed

Fair

Estimated nights from this unit's own capacity: 1.6 nights

Capacity 512 Wh covers your recommended minimum of 395 Wh.
Rated output 1,000 W handles your 35 W continuous load.

Surge rating is not verified, so we cannot confirm it covers the estimated 70 W startup spike.

Check Price on Amazon

Illustrative image — not an exact product photograph.

Anker SOLIX

C1000 Gen 2

1,024 Wh · 2,000 W rated

Oversized

≈2.6× your recommended minimum — much more than needed

Fair

Estimated nights from this unit's own capacity: 3.1 nights

Capacity 1,024 Wh covers your recommended minimum of 395 Wh.
Rated output 2,000 W handles your 35 W continuous load.
Surge rating 3,000 W covers the estimated 70 W startup spike.

Check Price on Amazon

Independent editorial illustration — not an official product photo.

BLUETTI

Elite 100 V2

1,024 Wh · 1,800 W rated · 25.4 lb (11.5 kg)

Oversized

≈2.6× your recommended minimum — much more than needed

Fair

Estimated nights from this unit's own capacity: 3.1 nights

Capacity 1,024 Wh covers your recommended minimum of 395 Wh.
Rated output 1,800 W handles your 35 W continuous load.
Surge rating 3,600 W covers the estimated 70 W startup spike.

Check Price on Amazon

Independent editorial illustration — not an official product photo.

EcoFlow

DELTA 3 Plus

1,024 Wh · 1,800 W rated

Oversized

≈2.6× your recommended minimum — much more than needed

Fair

Estimated nights from this unit's own capacity: 3.1 nights

Capacity 1,024 Wh covers your recommended minimum of 395 Wh.
Rated output 1,800 W handles your 35 W continuous load.
Surge rating 3,600 W covers the estimated 70 W startup spike.

Check Price on Amazon

Illustrative image — not an exact product photograph.

EcoFlow

DELTA 3 Classic

1,024 Wh · 1,800 W rated · 26.7 lb (12.1 kg)

Oversized

≈2.6× your recommended minimum — much more than needed

Fair

Estimated nights from this unit's own capacity: 3.1 nights

Capacity 1,024 Wh covers your recommended minimum of 395 Wh.
Rated output 1,800 W handles your 35 W continuous load.
Surge rating 3,600 W covers the estimated 70 W startup spike.

Check Price on Amazon

Illustrative image — not an exact product photograph.

Segway

Cube 1000

1,024 Wh · 2,200 W rated · 35.7 lb (16.2 kg)

Oversized

≈2.6× your recommended minimum — much more than needed

Fair

Estimated nights from this unit's own capacity: 3.1 nights

Capacity 1,024 Wh covers your recommended minimum of 395 Wh.
Rated output 2,200 W handles your 35 W continuous load.
Surge rating 4,400 W covers the estimated 70 W startup spike.

Check Price on Amazon

Independent editorial illustration — not an official product photo.

Anker SOLIX

C800X

768 Wh · 1,200 W rated

Oversized

≈1.9× your recommended minimum — much more than needed

Not scored

Estimated nights from this unit's own capacity: 2.3 nights

Capacity 768 Wh covers your recommended minimum of 395 Wh.
Rated output 1,200 W handles your 35 W continuous load.
Surge rating 1,600 W covers the estimated 70 W startup spike.

Check Price on Amazon

Amazon bundle includes a 100W solar panel.

Illustrative image — not an exact product photograph.

Jackery

Explorer 1000 V2

1,070 Wh · 1,500 W rated · 23.8 lb (10.8 kg)

Oversized

≈2.7× your recommended minimum — much more than needed

Fair

Estimated nights from this unit's own capacity: 3.2 nights

Capacity 1,070 Wh covers your recommended minimum of 395 Wh.
Rated output 1,500 W handles your 35 W continuous load.
Surge rating 3,000 W covers the estimated 70 W startup spike.

Check Price on Amazon

Illustrative image — not an exact product photograph.

Anker SOLIX

C2000 Gen 2

2,048 Wh · 2,400 W rated · 41.7 lb (18.9 kg)

Oversized

≈5.2× your recommended minimum — much more than needed

Good

Estimated nights from this unit's own capacity: 6.2 nights

Capacity 2,048 Wh covers your recommended minimum of 395 Wh.
Rated output 2,400 W handles your 35 W continuous load.
Surge rating 4,000 W covers the estimated 70 W startup spike.

Check Price on Amazon

Illustrative image — not an exact product photograph.

Jackery

Explorer 2000 Plus

2,042.8 Wh · 3,000 W rated · 61.5 lb (27.9 kg)

Oversized

≈5.2× your recommended minimum — much more than needed

Good

Estimated nights from this unit's own capacity: 6.2 nights

Capacity 2,043 Wh covers your recommended minimum of 395 Wh.
Rated output 3,000 W handles your 35 W continuous load.
Surge rating 6,000 W covers the estimated 70 W startup spike.

Check Price on Amazon

Illustrative image — not an exact product photograph.

Jackery

Explorer 2000 V2

2,042 Wh · 2,200 W rated · 39.5 lb (17.9 kg)

Oversized

≈5.2× your recommended minimum — much more than needed

Good

Estimated nights from this unit's own capacity: 6.2 nights

Capacity 2,042 Wh covers your recommended minimum of 395 Wh.
Rated output 2,200 W handles your 35 W continuous load.
Surge rating 4,400 W covers the estimated 70 W startup spike.

Check Price on Amazon

Illustrative image — not an exact product photograph.

EcoFlow

DELTA 2 Max

2,048 Wh · 2,400 W rated · 50.7 lb (23 kg)

Oversized

≈5.2× your recommended minimum — much more than needed

Good

Estimated nights from this unit's own capacity: 6.2 nights

Capacity 2,048 Wh covers your recommended minimum of 395 Wh.
Rated output 2,400 W handles your 35 W continuous load.
Surge rating 4,800 W covers the estimated 70 W startup spike.

Check Price on Amazon

Illustrative image — not an exact product photograph.

Pecron

E2400LFP

2,048 Wh · 2,400 W rated · 45.2 lb (20.5 kg)

Oversized

≈5.2× your recommended minimum — much more than needed

Good

Estimated nights from this unit's own capacity: 6.2 nights

Capacity 2,048 Wh covers your recommended minimum of 395 Wh.
Rated output 2,400 W handles your 35 W continuous load.
Surge rating 4,000 W covers the estimated 70 W startup spike.

Check Price on Amazon

Illustrative image — not an exact product photograph.

BLUETTI

AC200L

2,048 Wh · 2,400 W rated · 62.4 lb (28.3 kg)

Oversized

≈5.2× your recommended minimum — much more than needed

Fair

Estimated nights from this unit's own capacity: 6.2 nights

Capacity 2,048 Wh covers your recommended minimum of 395 Wh.
Rated output 2,400 W handles your 35 W continuous load.
Surge rating 3,600 W covers the estimated 70 W startup spike.

Check Price on Amazon

Illustrative image — not an exact product photograph.

BLUETTI

AC180

1,152 Wh · 1,800 W rated · 35.3 lb (16 kg)

Oversized

≈2.9× your recommended minimum — much more than needed

Fair

Estimated nights from this unit's own capacity: 3.5 nights

Capacity 1,152 Wh covers your recommended minimum of 395 Wh.
Rated output 1,800 W handles your 35 W continuous load.

Surge rating is not verified, so we cannot confirm it covers the estimated 70 W startup spike.

Check Price on Amazon

Independent editorial illustration — not an official product photo.

BLUETTI

Apex 300

2,764.8 Wh · 3,840 W rated

Oversized

≈7.0× your recommended minimum — much more than needed

Good

Estimated nights from this unit's own capacity: 8.4 nights

Capacity 2,765 Wh covers your recommended minimum of 395 Wh.
Rated output 3,840 W handles your 35 W continuous load.
Surge rating 7,680 W covers the estimated 70 W startup spike.

Check Price on Amazon

Illustrative image — not an exact product photograph.

BLUETTI

Elite 300

3,014.4 Wh · 2,400 W rated · 58 lb (26.3 kg)

Oversized

≈7.6× your recommended minimum — much more than needed

Great

Estimated nights from this unit's own capacity: 9.2 nights

Capacity 3,014 Wh covers your recommended minimum of 395 Wh.
Rated output 2,400 W handles your 35 W continuous load.
Surge rating 4,800 W covers the estimated 70 W startup spike.

Check Price on Amazon

Illustrative image — not an exact product photograph.

Pecron

E3600LFP

3,072 Wh · 3,600 W rated · 79.4 lb (36 kg)

Oversized

≈7.8× your recommended minimum — much more than needed

Good

Estimated nights from this unit's own capacity: 9.3 nights

Capacity 3,072 Wh covers your recommended minimum of 395 Wh.
Rated output 3,600 W handles your 35 W continuous load.
Surge rating 7,000 W covers the estimated 70 W startup spike.

Check Price on Amazon

Illustrative image — not an exact product photograph.

Anker SOLIX

F3000

3,072 Wh · 3,600 W rated · 91.5 lb (41.5 kg)

Oversized

≈7.8× your recommended minimum — much more than needed

Good

Estimated nights from this unit's own capacity: 9.3 nights

Capacity 3,072 Wh covers your recommended minimum of 395 Wh.
Rated output 3,600 W handles your 35 W continuous load.
Surge rating 7,200 W covers the estimated 70 W startup spike.

Check Price on Amazon

Illustrative image — not an exact product photograph.

Anker SOLIX

S2000

2,010 Wh · 1,500 W rated · 35.7 lb (16.2 kg)

Oversized

≈5.1× your recommended minimum — much more than needed

Good

Estimated nights from this unit's own capacity: 6.1 nights

Capacity 2,010 Wh covers your recommended minimum of 395 Wh.
Rated output 1,500 W handles your 35 W continuous load.

Surge rating is not verified, so we cannot confirm it covers the estimated 70 W startup spike.

Check Price on Amazon

Independent editorial illustration of the DJI Power 2000 — not an official manufacturer photograph.

Independent editorial illustration — not an official product photo.

DJI

Power 2000

2,048 Wh · 3,000 W rated

Oversized

≈5.2× your recommended minimum — much more than needed

Fair

Estimated nights from this unit's own capacity: 6.2 nights

Capacity 2,048 Wh covers your recommended minimum of 395 Wh.
Rated output 3,000 W handles your 35 W continuous load.

Surge rating is not verified, so we cannot confirm it covers the estimated 70 W startup spike.

Check Price on Amazon

Independent editorial illustration — not an official product photo.

Goal Zero

Yeti 1500 (6th Gen)

1,505 Wh · 2,000 W rated

Oversized

≈3.8× your recommended minimum — much more than needed

Not scored

Estimated nights from this unit's own capacity: 4.6 nights

Capacity 1,505 Wh covers your recommended minimum of 395 Wh.
Rated output 2,000 W handles your 35 W continuous load.
Surge rating 3,600 W covers the estimated 70 W startup spike.

Check Price on Amazon

Illustrative image — not an exact product photograph.

Anker SOLIX

F3800

3,840 Wh · 6,000 W rated · 132.3 lb (60 kg)

Oversized

≈9.7× your recommended minimum — much more than needed

Good

Estimated nights from this unit's own capacity: 12 nights

Capacity 3,840 Wh covers your recommended minimum of 395 Wh.
Rated output 6,000 W handles your 35 W continuous load.
Surge rating 9,000 W covers the estimated 70 W startup spike.

Check Price on Amazon

Illustrative image — not an exact product photograph.

EcoFlow

DELTA Pro 3

4,096 Wh · 4,000 W rated

Oversized

≈10.4× your recommended minimum — much more than needed

Great

Estimated nights from this unit's own capacity: 12 nights

Capacity 4,096 Wh covers your recommended minimum of 395 Wh.
Rated output 4,000 W handles your 35 W continuous load.
Surge rating 8,000 W covers the estimated 70 W startup spike.

Check Price on Amazon

Independent editorial illustration — not an official product photo.

Mango Power

E

3,500 Wh · 3,000 W rated · 100.1 lb (45.4 kg)

Oversized

≈8.9× your recommended minimum — much more than needed

Good

Estimated nights from this unit's own capacity: 11 nights

Capacity 3,500 Wh covers your recommended minimum of 395 Wh.
Rated output 3,000 W handles your 35 W continuous load.

Surge rating is not verified, so we cannot confirm it covers the estimated 70 W startup spike.

Check Price on Amazon

Independent editorial illustration — not an official product photo.

Growatt

HELIOS 3600

3,686.4 Wh · 3,600 W rated

Oversized

≈9.3× your recommended minimum — much more than needed

Good

Estimated nights from this unit's own capacity: 11 nights

Capacity 3,686 Wh covers your recommended minimum of 395 Wh.
Rated output 3,600 W handles your 35 W continuous load.

Surge rating is not verified, so we cannot confirm it covers the estimated 70 W startup spike.

Check Price on Amazon

Independent editorial illustration — not an official product photo.

EcoFlow

DELTA Pro Ultra

6,144 Wh · 7,200 W rated

Oversized

≈15.6× your recommended minimum — much more than needed

Excellent

Estimated nights from this unit's own capacity: 19 nights

Capacity 6,144 Wh covers your recommended minimum of 395 Wh.
Rated output 7,200 W handles your 35 W continuous load.
Surge rating 10,800 W covers the estimated 70 W startup spike.

Check Price on Amazon

Possible matches (4)

Independent editorial illustration — not an official product photo.

Jackery

Explorer 500 v2

512 Wh · Not verified rated · 12.6 lb (5.7 kg)

Possible Match

Not scored

Estimated nights from this unit's own capacity: 1.6 nights

Capacity 512 Wh covers your recommended minimum of 395 Wh.

Rated continuous output is not verified for this unit.
Surge rating is not verified, so we cannot confirm it covers the estimated 70 W startup spike.

Check Price on Amazon

Independent editorial illustration of the DJI Power 1000 V2 — not an official manufacturer photograph.

Independent editorial illustration — not an official product photo.

DJI

Power 1000 V2

1,024 Wh · Not verified rated · 31.3 lb (14.2 kg)

Possible Match

Fair

Estimated nights from this unit's own capacity: 3.1 nights

Capacity 1,024 Wh covers your recommended minimum of 395 Wh.

Rated continuous output is not verified for this unit.
Surge rating is not verified, so we cannot confirm it covers the estimated 70 W startup spike.

Check Price on Amazon

Independent editorial illustration — not an official product photo.

Jackery

Explorer 5000 Plus

5,040 Wh · Not verified rated · 134 lb (60.8 kg)

Possible Match

Great

Estimated nights from this unit's own capacity: 15 nights

Capacity 5,040 Wh covers your recommended minimum of 395 Wh.

Rated continuous output is not verified for this unit.
Surge rating is not verified, so we cannot confirm it covers the estimated 70 W startup spike.

Check Price on Amazon

Amazon option includes an Anderson extension cable

Independent editorial illustration — not an official product photo.

Jackery

Explorer 3000 v2

3,072 Wh · Not verified rated · 59.5 lb (27 kg)

Possible Match

Not scored

Estimated nights from this unit's own capacity: 9.3 nights

Capacity 3,072 Wh covers your recommended minimum of 395 Wh.

Rated continuous output is not verified for this unit.
Surge rating is not verified, so we cannot confirm it covers the estimated 70 W startup spike.

Check Price on Amazon

Not suitable for this requirement (4)

Independent editorial illustration — not an official product photo.

Jackery

Explorer 300 Plus

288 Wh · 300 W rated · 8.3 lb (3.8 kg)

Not Suitable

Fair

Rated output 300 W handles your 35 W continuous load.
Surge rating 600 W covers the estimated 70 W startup spike.

Capacity 288 Wh is below the 329 Wh of usable energy your devices need.

Check Price on Amazon

Illustrative image — not an exact product photograph.

Anker SOLIX

C300

288 Wh · 300 W rated

Not Suitable

Not scored

Rated output 300 W handles your 35 W continuous load.
Surge rating 600 W covers the estimated 70 W startup spike.

Capacity 288 Wh is below the 329 Wh of usable energy your devices need.

Check Price on Amazon

Independent editorial illustration — not an official product photo.

EcoFlow

RIVER 3 Plus

286 Wh · 600 W rated · 10.4 lb (4.7 kg)

Not Suitable

Fair

Rated output 600 W handles your 35 W continuous load.
Surge rating 1,200 W covers the estimated 70 W startup spike.

Capacity 286 Wh is below the 329 Wh of usable energy your devices need.

Check Price on Amazon

Illustrative image — not an exact product photograph.

BLUETTI

Elite 30 V2

288 Wh · 600 W rated · 9.5 lb (4.3 kg)

Not Suitable

Limited

Rated output 600 W handles your 35 W continuous load.

Capacity 288 Wh is below the 329 Wh of usable energy your devices need.
Surge rating is not verified, so we cannot confirm it covers the estimated 70 W startup spike.

Check Price on Amazon

Why these results?

Recommendations are deterministic: your required continuous output, capacity (with reserve) and estimated surge are compared against each unit’s manufacturer-published specs, then your stated hard requirements are applied. Nothing here is sponsored, and no score is invented to rank a product.

Formula

Total device watts = base CPAP watts + humidifier watts (if active) + heated-tube watts (if active). Wh per night = total watts × hours per night. Recommended minimum capacity (Wh) = (Wh per night × nights) ÷ usable efficiency × (1 + reserve fraction).

Why there's no single "CPAP wattage"

CPAP power draw depends on brand, model, pressure setting, altitude compensation, and whether a heated humidifier or heated tube is active — published figures for base machines commonly range from roughly 15 to 60 W, before humidifier or tubing draw is added. There is no single number that applies to every machine.

The most reliable figure is your own device's rating label or the manufacturer's power-supply specification (often printed directly on the power brick). A plug-in energy meter gives an even more precise real-world average, since actual draw varies with pressure and humidity settings.

Humidifier and heated tube add meaningfully

A heated humidifier can add roughly 20-60 W depending on the heat setting, and a heated tube adds further draw on top of that. Both toggles in the calculator let you add this on top of the base machine wattage rather than guessing a single combined number.

AC inverter power vs. direct DC

Running a CPAP through a power station's AC inverter outlet loses some energy to conversion, the same way any AC device does. Many CPAP machines also accept a direct 12V/24V DC cable when paired with the right adapter, which skips that conversion step and is typically more efficient — check your machine's compatibility before relying on this.

The calculator lets the AC/DC choice adjust the starting point of the efficiency slider (higher for DC), but the slider itself stays fully editable — this is a starting assumption, not a measured figure for your exact setup.

Common mistakes

Using a generic "40 W" figure for every CPAP model instead of the actual machine's rating label.
Forgetting to add humidifier or heated-tube draw, which can understate real consumption by 50% or more.
Assuming DC operation automatically works — not every CPAP machine has a supported DC input; check compatibility first.
Treating the reserve headroom as unnecessary for medical equipment — it exists specifically to absorb estimate error.

Related guides

How Long Can a Power Station Run a CPAP Machine?

FAQ

Is this medical advice?

No. This tool calculates estimated battery runtime from the numbers you enter — it does not assess therapy adequacy, altitude compensation, or medical suitability. Talk to your equipment provider or physician about backup power planning for your specific therapy needs.

Where do I find my CPAP's actual power draw?

Check the rating label on the machine or its power supply/brick, or the manufacturer's published specification sheet for your exact model. A plug-in energy meter between the wall outlet and the power supply gives the most accurate real-world average.

Does altitude or air pressure setting change power draw?

It can — the motor works harder at a higher prescribed pressure or with altitude compensation active. If your machine's documentation gives a range rather than one figure, use the higher end for a more conservative estimate.

Sources

PowerMatchLab's own Power Calculator methodology (same formulas, see About & Methodology)

Last updated September 11, 2026. This tool performs calculations from the numbers you enter — it does not measure, test or guarantee real-world performance. See About & Methodology.