Batteries Series Wiring

This is my 4th post in a series about RV electrical set-ups. Although the information is is fairly basic it will help if you read the entire series.

Post #1 Deep cycle batteries

Post #2 Ratings and sizes

Post #3 Parallel wiring

In my previous post I talked about the most common way RV batteries are wired when there are multiple batteries being used for electrical power in your RV. In this post I will describe series wiring. To wire two batteries in a series you connect the negative lead to the positive lead of the second battery. The open posts of each battery are connected to the load. Keep in mind each battery increases the voltage. In the example below two 6 volt batteries connected in a series create a 12 volt output.

Likewise if two 12 volt batteries were wired together in a series you would have a 24 volt output. Most autos, motor-homes, and travel trailers operate with 12 volts.

So why would you use two 6 volt batteries wired in a series to run a 12 volt system? I’ve heard competing opinions on this topic. There is one school of thought that says 6 volt golf cart batteries have higher reserve capacity and are constructed better for deep cycle discharges than a 12 volt deep cycle battery. There is another school of thought that says today’s 12 volt deep cycle batteries are constructed just as well as golf cart batteries.

What set-up do you use?

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