Without knowing what size 12 volt batteries you have, it's difficult to advise. Two GP24 batteries will have SUBSTANTIALLY less power to deliver than two GP31 batteries...
One thing to consider is your CPAP. If you're running it through an inverter and operating it on 120 VAC, there is "some power loss through the inverter. PLUS, if you've got the water heater circuit and tube heater circuit powered on, those functions use a tremendous amount of power and likely would discharge a couple of "cheap dealer supplied GP24 batteries in 6-8 hours of use.
On the other hand, if you have larger, better type batteries, you may have problems with the solar charging system or an issue with battery failure....
Hard to know for sure, but "two dealer cheapies and a CPAP with the humidity and tube warming systems powered on" will put a heavy load on the battery charge...
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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