C-PAP machine and a TC?

I've been using a CPAP for close to 24 years & 10 of that camping. If you use a humidifier with the CPAP, your power needs will increase. If you don't already have a 12 volt adapter, get the "one made for your machine" from any CPAP supplier. The adapter will allow you to plug directly into any 12 volt receptacle that's available. The alternative to that is use a "pure sine wave" inverter & the same power cord you use at home. I personally do not use a humidifier. I use the 12 volt adapter connected directly to a small 35amp AGM battery next to the bed, it lasts 2-3 nights before recharging is needed.

Assuming you have a single 12 volt battery for the RV, consider my alternative & have in place a method of charging both the coach battery & dedicated CPAP battery if that's the way you go. A single 12 volt battery will give you anywhere from 40-60 usable amps @ 50% SOC for the RV & CPAP & that's not enough

BTPO1 wrote:
My CPAP machine runs on 12VDC and on 120VAC hers might also. If it does a power cord can be purchased and run from a 12 volt power port. I have used mine dry camping with no problems.

I bought a 12V cord which is made for my make and model of CPAP.

I've learned a lot about batteries and how to monitor them since my sleep apnea diagnosis about 1.5 years ago. Bought a little portable digital monitor which plugs into the 12V socket and shows battery voltage. I kept a chart of voltage in evening and morning for a while until I learned what to expect.

Have found that I can go about 3 nights including using the humidifier without charging the batteries (about 220 amp hours worth of AGMs, which are not supposed to be taken below 50 percent charge); then I have do something (drive around or get a hookup camp for a night) to charge. It is so dry where I usually travel that I find the humidifier to be necessary.

Your battery bank and mine are undoubtedly not the same. Your wife's CPAP may not use the same amount of power as mine. Your other power needs may not be the same as mine.

With the right setup, she can still dry camp and use the CPAP.

Happy camping.

You may need to get a portable 12vDC battery to power your CPAP. There are some interesting new options, some are very small and portable, but $$$. There are also some portable solar options to recharge the portable battery, but also $$$.

I'm assuming that your CPAP power cord/transformer can manage 120vAC to 12vDC. I have an auxiliary 12vDC battery (15 lbs.) with carrying case from Respironics that will power my CPAP for 2+ nights without recharging if I don't used the humidifier.

Many CPAP's will run on 12 volts. What you have to watch out for is the humidifier. I your wife uses a CPAP with a humidifier, you will need a larger battery because the heating element in the humidifier takes a lot of power. Some humidifiers will not work on 12 volts. The instructions say to disconnect the humidifier before turning on the CPAP. If she can get by with out the humidifier, it is a easy project to supply an outlet for 12 volts for the CPAP.

My CPAP machine runs on 12VDC and on 120VAC hers might also. If it does a power cord can be purchased and run from a 12 volt power port. I have used mine dry camping with no problems. Personally I if it will work on 12 volts I would use that instead of the inverter which will use more power. JMO

Figure out how much power it requires and buy an inverter rated for at least that much.