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A little slack is good, but you don’t want it too long as it makes it harder to tuck the wires in the box.Īnd the cables need to be just as thick as your original incoming battery wires. You want the cables to be around 2 feet long, depending on how close your batteries are to each other. Since you will be wiring two batteries together, you will need a set of positive and negative jumper cables or wires. Since the batter box is plastic, and the RV bounces down the road, the small head of a screw will eventually poke through the plastic and come detached from the trailer. When using any attachment, it is important to use it with washers. These will be needed to secure your single or double box to the trailer. Next on the list are attachment screws or bolts. When you have two separate boxes, you will have wires going to them, which can look a little less organized. And once the cover is put on, it gives you a clean look. The reason is that with a dual battery box, both batteries and wires are tucked away in one box. Personally, I prefer the dual battery box. Now that you have a location picked, the next decision is whether to add a second single battery box or replace the single box with a dual battery box. Your battery box is located within an exterior compartment in a motor home, as in the photo above. A couple of pieces of angle iron or steel usually act as a tray for your battery box. In a travel trailer, the battery box is located at the front of the camper near the hitch. The first step is to ensure you have a great location to add this dual battery. Now let’s get you started and see what you need to gather to get the added battery to your RV. When you have that second battery, you have that backup DC power to get your slide in and run the jack motor to get you back on the road. Whether you have lithium batteries, AGM batteries, or a good old fashion lead acid battery, they fail and can be an issue.

When you are set up with 12V multiple batteries, you have a backup in case of original battery failure.

The additional battery in case of failure.

Adding a second battery will increase how long your inverter power will last. This will allow you to use things such as receptacles in your RV when not connected to shore power. This inverter will convert your battery’s DC power to AC power. Some RVs and travel travelers are equipped with an inverter. Your camping fridge, slide-out motor, and lights rely on battery power. Adding that second battery will theoretically double your power capacity for your DC loads.

Final Thoughts Benefits Of Adding Second Battery To RVīefore we dive into the wiring and installation of a dual battery, here is a quick recap of the benefits of adding that second RV battery:.

Step 2: Connect The Positive Wire From The RV To The OTHER Battery.

Step 1: Connect The Negative Wire From RV To the Negative Battery Terminal.

Benefits Of Adding Second Battery To RV.

Connecting the second battery to the RVĮspecially if you go boondocking or dry camp, the dual battery system is a must for you and your RV.

In this article, we will discuss the steps you need to take to add a second battery to your RV so that you can also benefit from having an additional power source, including: Even if you are always connected to shore power, your RV battery operates so many appliances and lights that the existing battery may have trouble keeping up with. It is one of those simple things that many RV owners can do that is inexpensive and adds tremendous value to your camping experience. Adding a second battery to an RV is one of my first upgrades to a new camper.