It is possible to use a CPAP machine while on charter (many past clients have). Our boats have inverters so you can operate a CPAP machine at night when plugged into shore power (about 60% of ports have shore power). While some of our catamarans do have generators, we aren’t able to run them at night due noise and equipment restrictions. Since some ports don’t have shore power it would be very helpful to have a portable battery. Here are two options we can recommend based on past customer reviews: a) 166Wh portable generator or b) 99.9Wh Power Bank.
These can be easily charged during the day so that it will have enough power at night.