Two 6 volt batteries above and two 12 volt batteries left. This configuration will still provide you with 12v of voltage which is the requirement for running appliances in an rv.

What You Need To Know About Your Rv Batteries Koa Camping Blog
6 volt rv batteries in series. When you combine two of them in series you get 12v. Two 6 volt batteries above and two 12 volt batteries below. Combining two 6v rv batteries only increases the voltage but not the amp hours like when you wire two 12v rv batteries in. The result would be a battery bank that produces 12v and 225ah. Most people will have two 6 volt batteries wired in series for their rv. Two 100 amp hour 6 v batteries in series have the sam capacity as one 100 ah 12 volt battery.
In a series circuit the flow of charge in the form of current remains constant throughout the circuit. Video of the day. This is called a series parallel configuration. 6v batteries connected in series many experienced rv owners would often upgrade their batteries to 2 x 6v batteries that are connected in series. Each 6 volt battery pair operates as a single 12 volt battery. 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.
But you still will only have 225ah. Connecting two batteries in series requires wiring the positive terminal of one battery to the negative terminal of the other battery. Two 12 volt batteries in parallel have twice the capacity of the six volt series but the 12 volt parallel connection is a dangerous fire and explosion hazard. You can then connect each 6 volt pair in parallel with another pair to create a larger 12 24 or 48 volt battery bank. The only difference is the connection between the two batteries. Fuses or circuit breakers for each battery should be used to prevent a good battery discharging high current into a failed battery with a shorted cell for example.
Wiring batteries in a series 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. To produce a 12 volt output two 6 volt deep cycle batteries must be wired in series positive to negative. Take a look at the diagrams here. 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. In our illustration we show two 6v batteries with 225ah wired together. Charging 6v batteries in series to create an electrical circuit in series make an electrical circuit that loops through each element one after another like they were metal chains linking together.
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. Two 6 volt batteries with a rating of 200 amp hours that are wired in series will result in a 12 volt battery bank with a 200 amp hour capacity. This battery can operate under extreme conditions with an operating temperature range that extends from 4 f all the way up to 140 f. Take a look at the diagrams here. A 6v 225ah agm deep cycle rv battery will weigh around 71 lbs. Advantages of using 6v batteries.