Dual RV Battery Wiring Diagram: Everything You Need to Know

If you’re an avid RV traveler, you know the importance of having a reliable power source. That’s why having a dual battery system is a smart choice. However, setting up the dual RV battery system can be intimidating if you’re not familiar with the wiring diagram. In this article, we’ll walk you through everything you need to know about dual RV battery wiring diagram in relaxed English language.

What is a Dual RV Battery System?

A dual RV battery system consists of two batteries connected together in parallel. This setup is useful when you need a backup power source or when you want to run high-power electrical appliances. By having two batteries, you can extend the life of your RV battery and have more power available when you need it.

Advantages of a Dual RV Battery System

Here are some advantages of having a dual RV battery system:

  • You have more power available when you need it.
  • You can run high-power electrical appliances without draining one battery too quickly.
  • If one battery fails, you have a backup battery to rely on.
  • You can extend the life of your batteries with proper maintenance.

Disadvantages of a Dual RV Battery System

Here are some disadvantages of having a dual RV battery system:

  • It can be more expensive to set up than a single battery system.
  • You need to monitor and maintain two batteries instead of one.

Dual RV Battery Wiring Diagram: Step by Step Guide

Now that you know what a dual RV battery system is, it’s time to set it up. Follow these steps to create your own dual RV battery system:

Step 1: Gather Your Tools and Materials

Before you start, make sure you have the following tools and materials:

  • Two 12-volt deep cycle batteries
  • Battery cables (red and black)
  • Battery terminal cleaner
  • Battery terminal protectant
  • Wire cutters
  • Wire strippers
  • Wrench or pliers

Make sure you have the right tools and materials before you start the installation process.

Step 2: Clean and Prepare the Batteries

Before you connect the batteries, make sure they are clean and free of dirt and debris. Use a battery terminal cleaner to remove any corrosion or buildup on the terminals. Then, apply a battery terminal protectant to prevent future corrosion.

Step 3: Connect the Batteries in Parallel

The next step is to connect the batteries in parallel. This means that the positive terminals of both batteries are connected together, and the negative terminals are also connected together. Here’s how to do it:

  1. Connect the red cable to the positive terminal on one of the batteries.
  2. Connect the other end of the red cable to the positive terminal on the other battery.
  3. Connect the black cable to the negative terminal on one of the batteries.
  4. Connect the other end of the black cable to the negative terminal on the other battery.

Step 4: Test the Battery System

Once you’ve connected the batteries in parallel, it’s time to test the system. Turn on your RV and check that all electrical appliances are working properly. You should also check the voltage of the batteries with a multimeter to make sure they are both charged and working correctly.

Dual RV Battery Wiring Diagram FAQs

Q: How long can a dual RV battery last?

A: The lifespan of a dual RV battery depends on many factors, such as the type of battery, usage frequency, and maintenance. With proper maintenance, a dual RV battery can last up to five years.

Q: Can I charge my dual RV battery while driving?

A: Yes, you can charge your dual RV battery while driving by using a battery isolator or a battery combiner. These devices allow the alternator to charge both batteries without draining the main battery.

Q: What should I do if one of my dual RV batteries is not working?

A: If one of your dual RV batteries is not working, you should replace it as soon as possible. Continuing to use a faulty battery can damage the other battery and cause a decrease in performance.

Q: Can I connect more than two batteries in parallel?

A: Yes, you can connect more than two batteries in parallel. However, make sure that the voltage and amp-hour ratings of the batteries are the same to prevent uneven charging and discharging.

Q: Do I need a special charger for my dual RV battery system?

A: No, you don’t need a special charger for your dual RV battery system. However, make sure that the charger is compatible with deep cycle batteries and has an automatic shut-off feature to prevent overcharging.

Term Definition
Deep Cycle Battery A battery designed to provide a steady, continuous source of power over a long period of time.
Battery Terminal Cleaner A chemical solution used to remove corrosion and buildup from battery terminals.
Battery Terminal Protectant A chemical solution used to prevent future corrosion on battery terminals.
Wire Cutters A tool used to cut wires to the desired length.
Wire Strippers A tool used to remove the insulation from the end of a wire.
Multimeter A tool used to measure electrical voltage and current.