Adding 12V Receptacles

Peg Leg wrote:
I have to charge my leg at night. It has a wall-wart transformer with a built in control system but uses 24v. I use a small inverter thru my bedroom 12v plug. Since I already had the 12v in the bedroom, I made sure the TV I bought used a 12v wall-wart so I can also use it when boondocking.

I'm not familiar with CPAC machines. Do they use a wall-wart to plug into a 120v receptacle? I ask because Ski says most will run on 12v. If so using a inverter to change 12v to 120v so a wall-wart can change it back to 12v. That will be so inefficient.

Ski said, they draw 3 amps, if that's at 12v the draw (36 watts) is about the same as a incandescent bulb and shouldn't be much of a problem tapping into any light circuit.

Now a 300 watt inverter is looking to pull 25 amps at 12v. This will need a dedicated circuit with larger wire. I might be easier to mount the inverter near the battery and run 120v circuit to a receptacle.

CPAPs (constant air pressure pump) do use a wall-wart to convert 110v to 12v which I didn't realize until I started asking questions on forums and was told that most will run on 12v with the proper cable which I now have for both my RV and house units, so I now only want an inverter at the entertainment center with 12v at the head of the bed and near the dinette (12v fan, chargers).
I just looked at the bedroom slide where the ceiling reading lamp is and was surprised to see no wires showing on the top side, then realized I was looking at the slider roof. :S So I have to go in through the fixture and surface run the wire from it to the 12v outlet mounting location 2.5' or so away. I guess I will fasten to the slider ceiling with staples. And I can do the same for the dinette ceiling light also in a slide out.
The entertainment inverter is on the back burner as I can live without it.