How many nights will the Goal Zero Yeti 500 run a CPAP without a humidifier?

About 7 nights of 8 hours (61 hours in total). A CPAP without a humidifier averages about 7 W, and the 499 Wh battery gives about 424 Wh after inverter losses.

How long does it last with a heated humidifier?

With the heated humidifier on (about 34 W), about 1 night (12 hrs). Without it (about 7 W), about 7 nights (3 days). Turning the humidifier off is the easiest way to stretch a charge.

Is the Goal Zero Yeti 500 enough backup for a CPAP without a humidifier?

Only as a short bridge. It covers about 7 nights (61 hours) from a full charge. A power station should never be your only backup for medical equipment: ask your equipment supplier what they provide in an outage, register with your utility’s medical-needs program, and keep the settings your prescriber gave you.

Goal Zero · Will it run?

Can the Goal Zero Yeti 500 run a CPAP (no humidifier)?

Published October 11, 2026

Short answerYes

Yes. The Goal Zero Yeti 500 runs a CPAP without a humidifier for about 7 nights (61 hours) from a full charge. At about 7 W on average it uses 1.7% of the battery an hour, and the 500 W output is far more than it needs.

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Key numbers

Nights per charge: 7 nights; 3 days
Battery used per hour: 1.7%; at 7 W average

CPAP (no humidifier)

Running: 7 W; 5–15 W range
Start-up: 10 W
Average: 7 W; runs all the time

Goal Zero Yeti 500

Battery: 499 Wh; about 424 Wh usable
Output: 500 W; continuous
Surge: 1,000 W; start-up peak

How we worked it out: 499 Wh × 0.85 ÷ 7 W = about 3 days (8 hours a night). The 0.85 covers inverter and battery losses. We do not test units ourselves; the numbers come from the official spec sheets and typical device draws. How we pick

Goal Zero Yeti 500

499 Wh · 500 W output · 1,000 W surge · 16.1 lb

Full specs and runtimes

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What else the Goal Zero Yeti 500 runs

One device at a time, from a full charge.

Other power stations for a CPAP without a humidifier

The nearest sizes that also run it.

Keep going

Real runtime depends on the model you own, room temperature and battery age. The 3 days above is an estimate, not a measured result.

Common questions

How many nights will the Goal Zero Yeti 500 run a CPAP without a humidifier?: About 7 nights of 8 hours (61 hours in total). A CPAP without a humidifier averages about 7 W, and the 499 Wh battery gives about 424 Wh after inverter losses.
How long does it last with a heated humidifier?: With the heated humidifier on (about 34 W), about 1 night (12 hrs). Without it (about 7 W), about 7 nights (3 days). Turning the humidifier off is the easiest way to stretch a charge.
Is the Goal Zero Yeti 500 enough backup for a CPAP without a humidifier?: Only as a short bridge. It covers about 7 nights (61 hours) from a full charge. A power station should never be your only backup for medical equipment: ask your equipment supplier what they provide in an outage, register with your utility’s medical-needs program, and keep the settings your prescriber gave you.