Scenarios › Power station for CPAP all night (and for several nights)
What size power station runs a CPAP all night?
A CPAP without the heated humidifier sips power, so the real question is how many nights you get per charge. Here is the size for one night with comfortable headroom — and what it takes to cover several nights or to run the heated humidifier.
356 Whcapacity needed
40 Wrunning watts
40 Wsurge to clear
8.0 hruntime horizon
This load: CPAP Machine (no humidifier). Want to tweak it? Open the full sizing tool and adjust the appliances and hours.
What size you need
You need about 356 Wh — and 42 units fit. The smallest sufficient is the Bluetti AC60; we never push more capacity than your load can use. Surge to clear: 40 W.
The math
Running watts (everything on at once) = 40 W
Surge watts (worst single startup + the rest running) = 40 W
Average draw (cyclic loads counted by their duty cycle) = 40 W
Watt-hours = 40 W × 8.0 h ÷ 90% usable reserve = 356 Wh
1
Bluetti AC60smallest that fits
403 Wh600 W cont · 1,200 W surgeexpandable~9.1 h on this load$$
IP65-rated for wet job sites and storms; under 19 lb, expandable well past its base 403 Wh.
LiFePO4 · 4 ways to recharge (AC/solar/car/lead-acid); expandable to 2,015 Wh with two B80 packs
🔗 The "Check price" buttons are brand-direct affiliate links. We earn a commission when you buy through one — at no extra cost to you, and it never changes which unit we recommend. Disclosure.
⚡ 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. Appliance wattages are representative chart values and vary by model; check your nameplates. Duty cycle (how much of the time a load actually draws) is how we keep the watt-hour estimate from overselling capacity.
Common questions
What size power station runs a CPAP all night?
For CPAP Machine (no humidifier) over 8.0 h, you need about 356 Wh of capacity, 40 W continuous output, and at least 40 W of surge. The smallest unit that clears all three is the Bluetti AC60; a step-up like the Goal Zero Yeti 700 adds headroom for longer outages.
How many watt-hours does this load need?
About 356 Wh for 8.0 h — we take the duty-weighted average draw (40 W, since cyclic loads like fridges and pumps don't run constantly), multiply by the hours, and divide by a usable-capacity reserve. Running watts are 40 W; surge is 40 W.
Sources: appliance wattages — standard appliance/generator sizing charts; 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.