My first thought is that if you are running two air conditioners you are going to need many times greater than 2,000 watt hours of capacity unless you will be running the gas generator when running the AC.
Yes to all questions. We are doing all but DC-DC charging. Not worth it with 1750W of solar on the roof.
In a nutshell, we connected the RV Plug input to the AC300 input and then the AC300 30A output to the RV mains and the 12V out put to the RV 12V. Basically the RV is always running off the AC300. Shore power and solar charge. When we rarely use the generator, we just plug in via the RV shore power connection.
We also have a way to bypass the AC300 and run just from shore power.
I have just purchased an AC300/B300/PV350 system to help with power when boondocking my Class A 28 ft. RV for 1 or 2 days. Currently my fridge can run on propane. I want to be able to use TV streaming, lights, coffee maker, and air fryer/oven at different times during the day. Will the one B300 be enough? Plan to add a second and possibly third PV350 to increase charging turnaround. Can I just plug in directly to my shore power outlet with the AC300 and monitor usage with the app to ensure enough power is available? As you can tell I am a newbie here trying to figure out this exciting world of solar combined by Bluetti! Thanks in advance for any constructive comments.