I've ran a CPAP on a regular car battery with humidifier overnight. The car battery dies part way into the second night- so make sure you recharge it.
On a real deep cycle battery, you'll get better performance.
And, as mentioned- if you can turn off the humidifier, that uses like 2-3x the energy.
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Officially a SOB with a 2022 Jayco Precept 36C
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