Do the trailer outlets run off the batteries?

Golden_HVAC wrote:
The 12 volt things will work as long as the battery stays charged. However a CPAP can discharge 2 batteries overnight. So you will need to upgrade the batteries, and also consider a larger solar system in order to dry camp at all.

I installed a 400 watt solar system in a larger fifth wheel for a CPAP owner. He already had two batteries, and I installed 2 more. A 1,500 watt MSW inverter, new electrical panel, and transfer switch. This powered two of the 120 volt circuits in the RV.

He could run the CPAP overnight and that would run down all 4 batteries. In the daytime, he would use the solar system to recharge the batteries, then sometimes need to run the generator to fully charge the batteries.

Fred.

Fred usually excellent advise aside, this is a case of "it depends". I have some friends that use a Group27 for two low load CPAP machines, it will run both for three nights.
I have other friends that use the "battery boaster", which, with again low load machines will run one for two nights, no charging,
Since these are all tent campers, I know they aren't running a generator.

A lot depends on the model CPAP machine you have, some are designed to run directly off 12VDC and don't suck a lot of power.
Some of them, well, they draw lots. Those include the models that add moisture