If you are looking for more power for your RV, connecting 2 RV batteries is a novel solution to your problem. Joining 2 RV batteries together increases the voltage, the capacity, or both to give you more power.
With that said, how do you connect 2 RV batteries safely? This article is going to outline how to connect 2 RV batteries – specifically AGM batteries for RVs.
Two options – in series or parallel?
There are two ways to connect RV batteries – either in series or in parallel.
Connecting 2 RV batteries in series
This method adds the voltage of both batteries together while keeping the same amount of amp hours.
When connecting 2 RV batteries in a series, you use jumper cables to connect the negative terminal of the first battery to the positive terminal of the second one. Using the second set of jumper cables, connect the two open terminals to your appliance.
Caution: Never cross the open positive and negative terminals as this will cause a short circuit and damage the battery.
Connecting 2 RV batteries in parallel
This type of connection increases the capacity rating of your setup, but the voltage won’t change.
When connecting 2 RV batteries in parallel, you will want to use a jumper cable to connect both positive terminals and a second jumper cable to connect both negative terminals of the batteries. This should give you a positive/positive and a negative/negative connection.
Although you can connect your entire load to one of the batteries, it will drain them both equally with no issue. With that said, the best way to connect 2 RV batteries in parallel is to connect the positive at one end of the battery, with the negative being connected to the other side. This helps equalize the charge distribution and keeps both batteries in good condition.
If you are unsure about the best approach to connecting 2 RV batteries, try to think about your usage. Do you need more capacity or more amp hours? Your answer will guide you toward the best setup. Remember to always stay safe when working with batteries and make sure your connections are correct. A diagram of your progress can be a good way to stay on track.