Worked example · One night

CPAP overnight backup: conservative battery sizing

An eight-hour AirSense 11 planning example with phone charging, 30% extra energy margin and explicit medical-device cautions.

2 device types30% extra energy marginWithout recharging

Quick answer

Battery target for the night

778Wh

Stated battery capacity, including a 30% extra energy margin on demand and 80% usable energy.

Adjust this example

At the official 56.1W typical AirSense 11 figure plus phone charging, the example uses about 479Wh. With 30% extra energy margin and an 80% usable-energy allowance, the rated battery target is about 778Wh.

Energy per day: 479 Wh
Power check: 71 / 88 W
Solar target: 250 W

Solar is a separate estimate. The battery target is calculated without intermediate recharging.

Shortlist first

Stations to compare first

We check both battery size and whether the station can handle the load. Solar compatibility is still a separate check.

17 of 19 meet the target

First models that meet both the battery and power target, then the longest calculated coverage. No ranking on price or portability.

Photo: EU versionEcoFlow ↗

EcoFlow

DELTA Pro 3

4,096 Wh · 4,000 W continu

Meets the target

View this model

Why this outcome?

Usable battery · 80%: 3,277 Wh
Coverage without extra margin: 6.8 days
Battery target with extra margin: Met
Power target: Met
Solar input · watt limit: 2,600 W · sufficient

Calculated solar lower bound: 212.8 W. The overview rounds this up to 50 W.

A watt limit does not prove a panel fits. Also check voltage, current, connectors and the regional version.

Check solar panel

Anker SOLIX

F3800

3,840 Wh · 6,000 W continu

Meets the target

View this model

Why this outcome?

Usable battery · 80%: 3,072 Wh
Coverage without extra margin: 6.4 days
Battery target with extra margin: Met
Power target: Met
Solar input · watt limit: 2,400 W · sufficient

Calculated solar lower bound: 212.8 W. The overview rounds this up to 50 W.

A watt limit does not prove a panel fits. Also check voltage, current, connectors and the regional version.

Check solar panel

Anker SOLIX

F3000

3,072 Wh · 3,600 W continu

Meets the target

View this model

Why this outcome?

Usable battery · 80%: 2,458 Wh
Coverage without extra margin: 5.1 days
Battery target with extra margin: Met
Power target: Met
Solar input · watt limit: 2,400 W · sufficient

Calculated solar lower bound: 212.8 W. The overview rounds this up to 50 W.

A watt limit does not prove a panel fits. Also check voltage, current, connectors and the regional version.

Check solar panel

View all 19 models

Photo: EU versionJackery ↗

Jackery

Explorer 3000 v2

3,072 Wh · 3,600 W continu

Meets the target

View this model

Why this outcome?

Usable battery · 80%: 2,458 Wh
Coverage without extra margin: 5.1 days
Battery target with extra margin: Met
Power target: Met
Solar input · watt limit: 1,000 W · sufficient

Calculated solar lower bound: 212.8 W. The overview rounds this up to 50 W.

A watt limit does not prove a panel fits. Also check voltage, current, connectors and the regional version.

Check solar panel

Photo: EU versionEcoFlow ↗

EcoFlow

DELTA 2 Max

2,048 Wh · 2,400 W continu

Meets the target

View this model

Why this outcome?

Usable battery · 80%: 1,638 Wh
Coverage without extra margin: 3.4 days
Battery target with extra margin: Met
Power target: Met
Solar input · watt limit: 1,000 W · sufficient

Calculated solar lower bound: 212.8 W. The overview rounds this up to 50 W.

A watt limit does not prove a panel fits. Also check voltage, current, connectors and the regional version.

Check solar panel

Photo: EU versionBLUETTI ↗

BLUETTI

AC200L

2,048 Wh · 2,400 W continu

Meets the target

View this model

Why this outcome?

Usable battery · 80%: 1,638 Wh
Coverage without extra margin: 3.4 days
Battery target with extra margin: Met
Power target: Met
Solar input · watt limit: 1,200 W · sufficient

Calculated solar lower bound: 212.8 W. The overview rounds this up to 50 W.

A watt limit does not prove a panel fits. Also check voltage, current, connectors and the regional version.

Check solar panel

Photo: EU versionJackery ↗

Jackery

Explorer 2000 Plus

2,043 Wh · 3,000 W continu

Meets the target

View this model

Why this outcome?

Usable battery · 80%: 1,634 Wh
Coverage without extra margin: 3.4 days
Battery target with extra margin: Met
Power target: Met
Solar input · watt limit: 1,400 W · sufficient

Calculated solar lower bound: 212.8 W. The overview rounds this up to 50 W.

A watt limit does not prove a panel fits. Also check voltage, current, connectors and the regional version.

Check solar panel

Photo: EU versionJackery ↗

Jackery

Explorer 2000 v2

2,042 Wh · 2,200 W continu

Meets the target

View this model

Why this outcome?

Usable battery · 80%: 1,634 Wh
Coverage without extra margin: 3.4 days
Battery target with extra margin: Met
Power target: Met
Solar input · watt limit: 400 W · sufficient

Calculated solar lower bound: 212.8 W. The overview rounds this up to 50 W.

A watt limit does not prove a panel fits. Also check voltage, current, connectors and the regional version.

Check solar panel

Photo: EU versionBLUETTI ↗

BLUETTI

AC180

1,152 Wh · 1,800 W continu

Meets the target

View this model

Why this outcome?

Usable battery · 80%: 922 Wh
Coverage without extra margin: 1.9 days
Battery target with extra margin: Met
Power target: Met
Solar input · watt limit: 500 W · sufficient

Calculated solar lower bound: 212.8 W. The overview rounds this up to 50 W.

A watt limit does not prove a panel fits. Also check voltage, current, connectors and the regional version.

Check solar panel

Photo: EU versionJackery ↗

Jackery

Explorer 1000 v2

1,070 Wh · 1,500 W continu

Meets the target

View this model

Why this outcome?

Usable battery · 80%: 856 Wh
Coverage without extra margin: 1.8 days
Battery target with extra margin: Met
Power target: Met
Solar input · watt limit: 400 W · sufficient

Calculated solar lower bound: 212.8 W. The overview rounds this up to 50 W.

A watt limit does not prove a panel fits. Also check voltage, current, connectors and the regional version.

Check solar panel

Anker SOLIX

C1000

1,056 Wh · 1,800 W continu

Meets the target

View this model

Why this outcome?

Usable battery · 80%: 845 Wh
Coverage without extra margin: 1.8 days
Battery target with extra margin: Met
Power target: Met
Solar input · watt limit: 600 W · sufficient

Calculated solar lower bound: 212.8 W. The overview rounds this up to 50 W.

A watt limit does not prove a panel fits. Also check voltage, current, connectors and the regional version.

Check solar panel

Photo: EU versionEcoFlow ↗

EcoFlow

DELTA 2

1,024 Wh · 1,800 W continu

Meets the target

View this model

Why this outcome?

Usable battery · 80%: 819 Wh
Coverage without extra margin: 1.7 days
Battery target with extra margin: Met
Power target: Met
Solar input · watt limit: 500 W · sufficient

Calculated solar lower bound: 212.8 W. The overview rounds this up to 50 W.

A watt limit does not prove a panel fits. Also check voltage, current, connectors and the regional version.

Check solar panel

Photo: EU versionEcoFlow ↗

EcoFlow

DELTA 3 Plus

1,024 Wh · 1,800 W continu

Meets the target

View this model

Why this outcome?

Usable battery · 80%: 819 Wh
Coverage without extra margin: 1.7 days
Battery target with extra margin: Met
Power target: Met
Solar input · watt limit: 1,000 W · sufficient

Calculated solar lower bound: 212.8 W. The overview rounds this up to 50 W.

A watt limit does not prove a panel fits. Also check voltage, current, connectors and the regional version.

Check solar panel

Photo: EU versionDJI ↗

DJI

Power 1000

1,024 Wh · 2,200 W continu

Meets the target

View this model

Why this outcome?

Usable battery · 80%: 819 Wh
Coverage without extra margin: 1.7 days
Battery target with extra margin: Met
Power target: Met
Solar input · watt limit: 800 W · sufficient

Calculated solar lower bound: 212.8 W. The overview rounds this up to 50 W.

A watt limit does not prove a panel fits. Also check voltage, current, connectors and the regional version.

Check solar panel

Anker SOLIX

C1000 Gen 2

1,024 Wh · 2,000 W continu

Meets the target

View this model

Why this outcome?

Usable battery · 80%: 819 Wh
Coverage without extra margin: 1.7 days
Battery target with extra margin: Met
Power target: Met
Solar input · watt limit: 600 W · sufficient

Calculated solar lower bound: 212.8 W. The overview rounds this up to 50 W.

A watt limit does not prove a panel fits. Also check voltage, current, connectors and the regional version.

Check solar panel

Photo: EU versionBLUETTI ↗

BLUETTI

Elite 100 V2

1,024 Wh · 1,800 W continu

Meets the target

View this model

Why this outcome?

Usable battery · 80%: 819 Wh
Coverage without extra margin: 1.7 days
Battery target with extra margin: Met
Power target: Met
Solar input · watt limit: 1,000 W · sufficient

Calculated solar lower bound: 212.8 W. The overview rounds this up to 50 W.

A watt limit does not prove a panel fits. Also check voltage, current, connectors and the regional version.

Check solar panel

Photo: EU versionEcoFlow ↗

EcoFlow

RIVER 3 Max Plus

858 Wh · 600 W continu

Meets the target

View this model

Why this outcome?

Usable battery · 80%: 686 Wh
Coverage without extra margin: 1.4 days
Battery target with extra margin: Met
Power target: Met
Solar input · watt limit: 220 W · sufficient

Calculated solar lower bound: 212.8 W. The overview rounds this up to 50 W.

A watt limit does not prove a panel fits. Also check voltage, current, connectors and the regional version.

Check solar panel

Photo: EU versionBLUETTI ↗

BLUETTI

AC70

768 Wh · 1,000 W continu

Recharge sooner needed

View this model

Why this outcome?

Usable battery · 80%: 614 Wh
Coverage without extra margin: 1.3 days
Battery target with extra margin: Not met
Power target: Met
Solar input · watt limit: 500 W · sufficient

Calculated solar lower bound: 212.8 W. The overview rounds this up to 50 W.

A watt limit does not prove a panel fits. Also check voltage, current, connectors and the regional version.

Check solar panel

Anker SOLIX

C800

768 Wh · 1,200 W continu

Recharge sooner needed

View this model

Why this outcome?

Usable battery · 80%: 614 Wh
Coverage without extra margin: 1.3 days
Battery target with extra margin: Not met
Power target: Met
Solar input · watt limit: 300 W · sufficient

Calculated solar lower bound: 212.8 W. The overview rounds this up to 50 W.

A watt limit does not prove a panel fits. Also check voltage, current, connectors and the regional version.

Check solar panel

What is included

The devices in this example

These are sensible starting values. Change the hours and exact devices in the planner to make the answer yours.

Adjust devices

CPAP planning load
449 Wh per day
Average consumption
56.1 W
Entered peak
73.2 W
Hours per day
8 hours
Quantity
1
Phone charging
30 Wh per day
Average consumption
15 W
Entered peak
20 W
Hours per day
2 hours
Quantity
1

Total for one day479 Wh

Useful tip 1

This calculation is not a backup plan

Test the exact machine, power supply, humidifier, heated tube and station for a complete night. Follow the manufacturer and clinician.

Useful tip 2

Comfort settings change consumption

Heated humidification can materially change runtime. Do not change therapy settings based on a battery estimate.

Calculation detailsSee the assumptions behind this answer

AirSense 11 uses its official 56.1W typical figure for eight hours
The entered 73.2W peak is checked separately
Phone charging adds 30Wh
A larger 30% extra energy margin is used because this is a critical load

How the battery target is formed

479 Wh per day × 1 day × 1.3 ÷ 0.8 ≈ 778 Wh

The daily consumption above is rounded for display. The calculation uses unrounded values. The factor is 1 + the extra energy margin, added to demand rather than kept as battery charge; the 80% usable-energy allowance is a separate factor.

SourcesSee manuals and supporting guides

ResMed AirSense 11 technical specifications↗Your Power Setup CPAP sizing guide→

Battery target for the night

Stations to compare first

DELTA Pro 3

F3800

F3000

Explorer 3000 v2

DELTA 2 Max

AC200L

Explorer 2000 Plus

Explorer 2000 v2

AC180

Explorer 1000 v2

C1000

DELTA 2

DELTA 3 Plus

Power 1000

C1000 Gen 2

Elite 100 V2

RIVER 3 Max Plus

AC70

C800

The devices in this example

CPAP planning load

Phone charging

This calculation is not a backup plan

Comfort settings change consumption

How the battery target is formed

Continue with another setup