You need about 427 Wh — and 41 units fit. The smallest sufficient is the Bluetti AC50B; we never push more capacity than your load can use. Surge to clear: 95 W.
The math
Running watts (everything on at once) = 60 W
Surge watts (worst single startup + the rest running) = 95 W
Average draw (cyclic loads counted by their duty cycle) = 48 W
Watt-hours = 48 W × 8.0 h ÷ 90% usable reserve = 427 Wh
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Bluetti AC50Bsmallest that fits
448 Wh700 W cont · 1,000 W surge~8.4 h on this load$
Slots between the EB3A and AC70 — 448 Wh and a 700 W inverter (1,000 W lift) for CPAP, a kettle, or camping gear at a budget price.
LiFePO4 · 45 min to 80% AC (70 min to 100%); 0-80% in 45 min with 200 W solar turbo mode · 15 lb
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⚡ Duty cycle matters here. The heater is the draw; it pulses, so average watts sit below the peak. We size watt-hours on the duty-weighted average (48 W), not the peak — so we don't oversell you capacity.
Can a specific unit run a cpap with heated humidifier?
52 of the units we track deliver enough watts to run a cpap with heated humidifier. Check a specific one for the runtime and the full verdict:
What size power station do I need to run a cpap with heated humidifier?
A cpap with heated humidifier draws about 60 W running, with a startup surge near 95 W. So you want a unit with at least 60 W continuous output and 95 W+ surge. For 8.0 h of runtime that's roughly 427 Wh of capacity — the Bluetti AC50B is the smallest unit that clears all of it.
How many watts does a cpap with heated humidifier use?
About 60 W while running, spiking to roughly 95 W on startup. It only draws power about 80% of the time, so over an outage its energy use is well below 60 W × the hours — which is why a modest battery lasts longer than you'd expect. The heater is the draw; it pulses, so average watts sit below the peak.
Sources: CPAP with Heated Humidifier wattage — Standard appliance-wattage / generator-sizing charts (representative values; verify your nameplate); station specs — manufacturer published specifications (compiled 2026-08-10; approximate). Informational only — a computed sizing estimate from published appliance-wattage charts and manufacturer station specs. It is not an electrical guarantee. For hardwired or whole-home backup, transfer switches, or any permanent install, consult a licensed electrician.