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More information would be really helpful, what size batteries, are the lights LED, what is the draw on the CPAP. If you get the draw on every item and add them up so you can figure what your AH are going to be. Then on the battery need to know the AH along with other info, are they two 12v wired in parallel or two 6v wired in series. But just pondering the question, you have not enough solar to charge the battery in one day, it may take up to 24+ hours and translate that into daytime hours when you have full sun. I just would not lead you into a situation where you run out of juice for the CPAP, unless you have a generator for a back up of course.
Recharging your batteries is one thing but depending on the batteries every day while out is another.
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