3 battery banks. Is it necesary?

My Alfa had the 6 batteries in the front and the control electrical components under the steps. There is a main fuse for the batteries in the front drivers side. The setup worked for me. If you have to replace batteries get the sealed no maintenance ones and just change the settings for charge.

I believe ALL 6 batteries supply the Coach and the Inverter. Alfa just did not have space to install all 6 in the same place. The 6 batteries are interconnected as they should be. Alfa did some goofy things. The first production models did NOT charge the Coach batteries when the Chassis engine was on by design. We never could get a decent answer on why. Later on they did connect a charge relay to charge both battery banks. Doug

I have always thought if I needed more battery power 2 banks would be a good idea if you do mostly dry camping. I have not heard much discussion on here about splitting batteries into 2 banks, but I would think it would be a lot less generator time to recharge 2 batteries from 50-80 percent SOC than 4 or 6 batteries. I know everyone's electrical needs are different but for me 2 6 v battery banks(4 6v batteries) would last me 2 weeks before I would need to recharge I would run out of water and laundry well before then. Are there many appliances that run of of 120 v?

It sounds like a good approach. You probably have a residential fridge and microwave as well as other devices running on 120 volt off the bank feeding the inverter. The other bank will be feeding all the 12 volt devices.

Of course I'm not the expert. But, you might just have 2 -12 volt for the chassis ( starting batteries). The other 4 might be 6 volt for the inverter( coach batteries). That's how it's been in the rigs we've had.

You don't want your starter batteries on the same system as your inverter. If you run them down off the inverter you'll might not get your rig started.