CPAP with heated humidifier: how much battery you need
CPAP with heated humidifier draws about 90 W (60–120 W range), runs 100% of the time and uses 720 Wh per day. Start-up surge: 120 W.
The heated humidifier and tube can double a CPAP’s draw; turning them off on battery stretches the night. Champion lists 60–120 W running; we use the middle for energy and the top starting figure (120 W) for the peak.
Battery needed
| Hours | Wh | Battery (Wh) | Inverter (W) |
|---|---|---|---|
| For 8 hours | 240 | 364 | 100 / 120 |
| For 24 hours | 720 | 1091 | 100 / 120 |
| For 72 hours | 2160 | 3273 | 100 / 120 |
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Stations that fit (24 h)
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FAQ
How many watts does a CPAP with heated humidifier use?
Typically 90 W while running, with a range of 60–120 W depending on model and age. Start-up surge can reach 120 W.
How long will a 1000 Wh power station run a CPAP with heated humidifier?
About 7.3 hours on the clock, allowing for the 100% duty cycle, inverter losses and a 20% reserve.
What size power station do I need for a CPAP with heated humidifier overnight (8 h)?
About 364 Wh of battery and an inverter rated at least 100 W continuous with 120 W surge.
Can I run a CPAP with heated humidifier on solar during an outage?
You need roughly 480 W of panels in winter to replace a day's use (720 Wh), charging through a station with a big enough MPPT input.
Other sizes
Other appliances
1 Approximate values: estimated from motor or heater power and typical figures published online, not from a manufacturer chart. Check your appliance label.
Inverter efficiency 88%, usable depth of discharge 90%, reserve 20%. Full method: How we calculate. source