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how to hook up two 12v rv batteries

How to Hook Up Two 12V RV Batteries


Hooking up two 12V RV batteries can provide more power and potentially extend your time off the grid. However, it’s essential to understand the process to ensure a successful connection. In this article, we will guide you through the steps required to hook up two 12V RV batteries properly.

Materials Needed

Before beginning, gather the following materials: 1. Two 12V deep cycle RV batteries 2. Battery cables (with appropriate length) 3. Wire cutters 4. Wire strippers 5. Wrench or pliers 6. Battery terminal cleaner 7. Battery terminal protectant

Step 1: Safety Precautions

Before working on your RV batteries, prioritize your safety. Ensure the engine is turned off, and disconnect any power source connected to your RV. Wear protective gloves and eyewear to avoid any accidents.

Step 2: Battery Placement

Choose a suitable location for your batteries, preferably a well-ventilated and dry area. Keep in mind that RV batteries can be heavy, so make sure the location can handle the weight. Additionally, ensure the placement allows easy access for maintenance.

Step 3: Connecting the Batteries

First, clean the battery terminals using a battery terminal cleaner to remove any corrosion or dirt. Strip approximately half an inch of insulation from the wire ends of your battery cables. Connect the positive terminal (+) of one battery to the negative terminal (-) of the second battery using a battery cable. This connection creates a series circuit.

Step 4: Final Connections

Next, connect the positive terminal (+) of the first battery to the positive terminal (+) of your RV. Similarly, connect the negative terminal (-) of the second battery to the negative terminal (-) of your RV. Use wrenches or pliers to tighten the connections securely.

Step 5: Additional Precautions

Once the connection is complete, double-check all the wire connections to ensure they are tight and secure. Apply a battery terminal protectant to the terminals to prevent corrosion. Additionally, leave enough slack in the cables to allow for movement or battery maintenance.


Hooking up two 12V RV batteries can enhance your camping experience by providing more power for your appliances and electronics. By following these steps, you can safely and effectively connect your batteries to enjoy extended off-grid adventures. Remember to prioritize safety and consult a professional if you have any doubts or concerns during the process.

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