≈ 2.5 nights (8h/night) · Safe motor start buffer (97.6% margin).
CPAP machine running (65 W max) and start-up (90 W max) draw fit the Bluetti AC180's 1,800 W continuous / 2,700 W surge ratings.
humidifier and heated tube off (15 W)
standard pressure with humidifier active (40 W)
high pressure with HumidAir and heated tube at max (65 W)
Via ResMed Air11 90 W DC/DC Converter (part 39231)
Via ResMed Air11 90 W DC/DC Converter (part 39231)
Via ResMed Air11 90 W DC/DC Converter (part 39231)
≈ 2.5 nights (8h/night)
System standby power: 15W (25.8% of total draw)
Provides 4× BS 1363 (230V) (120V 60Hz).
Pure sine wave inverter output. Safe for sensitive medical electronics and variable-speed motors.
Inductive motor/compressor load with 1.6× starting surge (motor inrush) (97.6% worst-case surge margin).
Wall AC fast charge at up to 1440W (45m to 80%, 78m to 100%).
Safe envelope verified: Starting surge (65W) remains comfortably below the 2700W surge trip line, with steady-state operation settling into the safe continuous zone at 40W.
About 19.8 hours on AC power, with the CPAP machine averaging 40 W (standard pressure with humidifier active (40 W)). The Bluetti AC180 then draws about 58 W from its battery, including 15 W for the inverter itself. Best case: about 37 hours (humidifier and heated tube off (15 W)). Worst case: about 13.5 hours (high pressure with HumidAir and heated tube at max (65 W)). At 8 hours a night, that's about 2.5 nights.
Yes. Using the ResMed Air11 90 W DC/DC Converter (part 39231) on the Bluetti AC180's 12 V car socket, the CPAP machine runs about 24 hours instead of 19.8 hours on AC, 22% longer, because it skips the inverter's conversion loss and its 15 W idle draw. That's 3 nights instead of 2.5 nights.
That simple division gives 29 hours, but the Bluetti AC180's inverter draws about 15 W whenever its AC outlets are on. At this light load that's 26% of everything the battery supplies, and inverter conversion losses take a further share. The idle figure comes from Bluetti.
On wall power: about 45 minutes to 80% and 78 minutes to full (Bluetti figures). With its maximum 500 W of solar input connected, expect about 400 W in full sun, so a full recharge takes roughly 3 hours of full sun, so it can refill in a single day with 4 peak sun hours.
It can act as a backup supply: with the CPAP machine plugged into the Bluetti AC180 and the Bluetti AC180 plugged into the wall, it switches the CPAP machine to battery in about 20 ms when the grid fails (Bluetti calls this UPS mode).
Statutory 30-day retail price announcements & rate revisions
Bord Gáis Energy winter rate adjustment: +1.60c/kWh Day, +0.90c/kWh Boost (2am–5am), and +€12.50/yr standing charge effective 20 Nov 2026.
Energia retail revision: +1.85c/kWh Day, +1.15c/kWh EV Boost (2am–6am), and +€14.20/yr standing charge effective 15 Nov 2026.
Dual Fuel Day Night: Day -4.64c/kWh, Night -3.25c/kWh (effective 2026-11-05)
Electricity Day Night: Day -4.64c/kWh, Night -3.25c/kWh (effective 2026-11-05)
SSE Airtricity statutory price cut: -1.25c/kWh Day, -0.65c/kWh Night, and -€8.40/yr standing charge effective 01 Oct 2026.
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