No, it won't work that way. The outlets (the ones that are like those in your house) are for AC current only. They do not work on DC current. The lights and stereo work because they are DC items powered by the battery if you are not plugged into external AC power. When you are plugged into external AC power your converter changes some of the AC to DC for those items and the water pump and furnace fan. You will have to determine if your CPAP can run directly off DC power. If so, you'll need the connector wires we discussed in earlier posts so you can hook it to the battery.