CPAP and BiPAP

CPAP and BiPAP on battery power

A CPAP night costs anywhere from about 50 Wh to more than 500 Wh. The humidifier and heated tube decide the size of power station you need, not the machine.

ResMed's power table measures its machines at about 6.3–9 W with no humidifier, 19–34 W with a humidifier, and 34–66 W with a humidifier and heated tube (ResMed). Those bands are why a night runs from about 50 Wh to more than 500 Wh. A car battery is not a power station: can a car battery run a CPAP separates the DC example from the inverter case.

Every machine and setting

AC nights = 1,024 Wh × 0.85 usable ÷ ((watts + about 15 W inverter draw) × 8 hr). DC nights = 1,024 Wh × 0.85 ÷ (watts × 8 hr), a best case with the maker's DC converter (ResMed Air11, Air10 or AirMini) in a 12 V car port; — means DC isn't modeled for that setting (ResMed's AirSense 10 guide says humidity off on an external battery, and Philips publishes no DC figure). ResMed figures are lab measurements from ResMed's published power table; the Philips row is the 80 W power-supply ceiling, a worst case. The 15 W is the inverter's own draw: BLUETTI counts about 15 W of self-consumption in its AC180 runtime formula, and an owner test measured about 17.5 W on a DELTA 3 Plus; larger stations can idle higher. Method, DC converter limits and picks: CPAP power station guide. The RIVER 2, RIVER 3 Plus and SOLIX C300 DC figures use their 12 V car outputs (EcoFlow RIVER 2 manual: 100 W max; RIVER 3 Plus specs: 126 W max; Anker C300 guide: 12 V 10 A). The DELTA Pro 3 has 12 V Anderson and DC5521 outputs but no car socket, so it stays AC-only here.

BiPAP (ResMed AirCurve)

AC nights = 1,024 Wh × 0.85 usable ÷ ((watts + about 15 W inverter draw) × 8 hr). DC nights = 1,024 Wh × 0.85 ÷ (watts × 8 hr), a best case with the maker's DC converter (ResMed Air11, Air10 or AirMini) in a 12 V car port; — means DC isn't modeled for that setting (ResMed's AirSense 10 guide says humidity off on an external battery, and Philips publishes no DC figure). ResMed figures are lab measurements from ResMed's published power table; the Philips row is the 80 W power-supply ceiling, a worst case. The 15 W is the inverter's own draw: BLUETTI counts about 15 W of self-consumption in its AC180 runtime formula, and an owner test measured about 17.5 W on a DELTA 3 Plus; larger stations can idle higher. Method, DC converter limits and picks: CPAP power station guide.

Nights on each station (AirSense 11)

Anker SOLIX F3800 row: nights use about 40 W of idle draw instead of 15 W, because Anker's FAQ for the F3800 Plus lists about 40 W with AC on and nothing connected (Anker). At CPAP loads that cuts its nights by roughly a third to a half; see the F3800 idle table. The F3800 DC column uses its 12 V ⎓ 10 A car charger output (Anker US user guide), which skips the inverter.

Nights of 8 hours. AC = nameplate Wh × 0.85 ÷ (average draw + about 15 W inverter draw). DC = nameplate Wh × 0.85 ÷ average draw, a best case with ResMed's Air11 DC converter in the 12 V car port; — means no car port is listed in the maker specs we checked. As an Amazon Associate we earn from qualifying purchases. The 15 W is the inverter's own draw: BLUETTI counts about 15 W of self-consumption in its AC180 runtime formula, and an owner test measured about 17.5 W on a DELTA 3 Plus; larger stations can idle higher. Method, DC converter limits and picks: CPAP power station guide.

Skipped models

Philips DreamStation 2, React Health Luna G3, Philips BiPAP models and the Transcend travel CPAP are not listed yet because their makers do not publish a power consumption figure we could verify. We would rather leave a model out than guess.

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• CPAP camping: power without hookups
• How many watts does a CPAP use?
• BiPAP battery backup
• CPAP on DC vs AC from a power station
• Can a car battery run a CPAP?
• What size solar panel for a CPAP?
• Best power station for a CPAP

Questions