Hi Ronnie-SKO,
I have 800 amp/hr of battery (four 200 amp/hr). The batteries are actually installed inside the bus in a custom box under the couch. The couch is connected to the walls of the bus with special fixtures that allow us to unhook it and pull it out with no tools. Our biggest problem is we only have space for two 400 watt solar panels on the roof. Two panels isn't enough to run the mini split for more than a day, they just can't keep up. When boon docking I'll need to run the generator in the afternoon to keep the batteries charged.
I'm planning on adding 2 external solar panels (eco flow portable 400 watt) by the time we're full time in the bus. I might need to add an additional propane tank (10 gallons) if we use our Newport heater a lot but so far we hardly need to turn it on (I'm in Southern California, not exactly a cold climate).