I use two size 27 Lifeline AGM 100 Ah batteries. I ran 6g wires from the back closet, from the panels, under and over to the water/sewer bay where the solar controller and 3000w inverter are. Right above is the electrical bay under the L couch with pre drilled holes for the heater vent. In the electrical bay I added a sub panel and moved everything but the AC and inverter circuits to it. I also added a second transfer switch here too. Ran 00 welding wire from the inverter to the batteries which are right across I the battery bay.
Works great.
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