Suggested Battery and Inverter upgrades?

[hardnocks]

Need to add an inverter or two to my 2011 Crusier CF305SK Patriot. Just got one new battery from Batteries Plus a SLI24MDP Duracell Ultra BCI Group 24M 12V 550CCA Flooded Marine & RV Battery. I have an 800 watt and 1200 Watt inverter one for bedroom and one for living room. I think I want to separate the circuits so I have a backup. Meed to be able to use my CPAP machine at night without draining the main system Any suggetions are appreciated on transfer switch, or wiring ideas. Thanks in advance...

[Lloyd]

Here is a link that might help you figure out what you need.
https://truckersinsider.com/how-many...r%202%20nights.