Originally Posted by Ela1948
I use a CPAP all the time and never run a generator at night. Some CPAP's have a 12 volt converter available. Even if you have a standard 120AC unit, there is no reason that you can't use a plug in inverter to power your CPAP off of your 12 volt batteries. If you disconnect the humidifier, they only draw about 80 watts.
X2, my CPAP has a 12V option. I can run mine off a 12V deep cycle battery with no issues. I played with it, but not done it. I camp without mine. I know some people who do. If I recall correctly they can go a couple nights on a single battery charge on a dedicated battery.
But back to your original question. If you are running a genny all night, a cheap group 24 dual purpose battery would work for you.