Charge spare battery
My wife and I both use CPAP machines. When we are at electric sites, no problem. When we do an overnight without hookups, it becomes a problem. The CPAP batteries run over $200 each, so over $400 for ...
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if you don't need the humidifier, turn it off. My cpap draws less than 8AH per night w/o humidifier, that will last many nights even with two cpap machines. with humidifier, power drain will depend a lot on amibient temps and how much heat it needs.
And, unless your cpap is really old, it will run on either 12VDC or if it is a resmed, 24VDC. for 24VDC there are several dc-dc converters for the resmed.
In reality virtually all the cpaps today run on 12 or 24V, the 120V plug either has a 12V brick inline or the cpap takes the 120V isolates it for safety and routs it to the DC input on the CPAP.
And, unless your cpap is really old, it will run on either 12VDC or if it is a resmed, 24VDC. for 24VDC there are several dc-dc converters for the resmed.
In reality virtually all the cpaps today run on 12 or 24V, the 120V plug either has a 12V brick inline or the cpap takes the 120V isolates it for safety and routs it to the DC input on the CPAP.
