Advantages of using 6v batteries. With 6 volts and up to 225 ampere hours you can supply continuous power to your rv for up to 20 hours and if you choose you can even couple it to another 6v battery to increase your overall voltage to 12.

How To Connect Four 6 Volt Rv Batteries
6 volt battery in series for rv. This configuration will still provide you with 12v of voltage which is the requirement for running appliances in an rv. At the basic level two 6 volt batteries are wired in series and two or more 12 volt batteries are wired in parallel in order to produce 12 volts final output. The only difference is the connection between the two batteries. The real capacity is the sum of the watt hours of the batteries in the bank. The result would be a battery bank that produces 12v and 225ah. In a series configuration the batteries are wired per the diagram below and the result would be a doubling of the voltage while the capacity remains the same.
You can then connect each 6 volt pair in parallel with another pair to create a larger 12 24 or 48 volt battery bank. A 6 volt battery for rv is actually a golf cart battery because they have thicker plates inside than a 12 volt deep cycle battery. Thus 6v x 200ah x 2 batteries is exactly equal to 12v x 100 ah x 2 batteries and both banks have 2400 watt hours of capacity. Many experienced rv owners would often upgrade their batteries to 2 x 6v batteries that are connected in series. A 6v battery bank charging system will give you added amp hours and increased life cycles. Two 6 volt 200 amp hour batteries in series have exactly the same capacity as two 12v 100 amp hour batteries in parallel.
Wiring batteries in a series. Each 6 volt battery pair operates as a single 12 volt battery. This battery can operate under extreme conditions with an operating temperature range that extends from 4 f all the way up to 140 f. Charging 6 volt batteries in series with 12 volt charger if you do or plan to do any type of off grid camping boondocking then a 6v battery bank system is a superior choice over a single 12v battery. With a thicker battery plate the 6 volt battery is able to deliver more long term energy and sustain deep discharging and recharging. This is called a series parallel configuration.
Take a look at the diagrams here. Qty 6 xtr6 235 6v 235ah agm solar battery bank qty 6 vmax xtreme series 6v agm deep cycle batteries 235ah 6 volt maintenance free 102 l x 71 w x 108 h 169999 1699. In our illustration we show two 6v batteries with 225ah wired together. Two 6 volt batteries above and two 12 volt batteries left. Wiring batteries in parallel. To produce a 12 volt output two 6 volt deep cycle batteries must be wired in series positive to negative.