how to connect 4 12v batteries to make 48v\

To connect four 12-volt batteries in series to create a 48-volt battery bank, you’ll need to follow a specific wiring configuration. This series connection combines the voltage of each battery, resulting in a higher total voltage while keeping the capacity (ampere-hours) the same. Here’s how to do it:

Materials You’ll Need:

  • Four 12-volt batteries
  • Battery interconnect cables or heavy-gauge wire
  • Wire cutterstripper
  • Wrench or socket set


  1. Safety Precautions:
    • Before working with batteries, always wear appropriate safety gear, including safety glasses and gloves, and ensure you’re in a well-ventilated area away from open flames or sparks.
  2. Identify the Batteries:
    • Label each of the four 12-volt batteries as “Battery A,” “Battery B,” “Battery C,” and “Battery D” to keep track of their positions.
  3. Determine the Positive and Negative Terminals:
    • Locate the positive (+) and negative (-) terminals on each battery. Typically, the positive terminal is marked with a “+,” and the negative terminal is marked with a “-.”
  4. Arrange the Batteries:
    • Position the four batteries in a row, side by side, so that the positive terminal of one battery is adjacent to the negative terminal of the next battery, creating a series connection. The arrangement should look like this:

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[Battery A (+)] — [Battery B (-)] — [Battery C (+)] — [Battery D (-)]

  1. Connect the Batteries in Series:
    • Use battery interconnect cables or heavy-gauge wire to connect the batteries in series. Connect the negative terminal of Battery A to the positive terminal of Battery B. Then, connect the negative terminal of Battery B to the positive terminal of Battery C. Finally, connect the negative terminal of Battery C to the positive terminal of Battery D.

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[Battery A (-)] — [Battery B (+)] — [Battery C (-)] — [Battery D (+)]

  1. Check the Voltage:
    • After making all the connections, you should have a 48-volt battery bank. Use a multimeter to confirm that the voltage across the entire battery bank is approximately 48 volts.
  2. Secure the Connections:
    • Ensure that all connections are tight and secure to prevent any accidental disconnection. Use a wrench or socket set to tighten terminal connections properly.
  3. Insulate Exposed Wiring:
    • Use electrical tape or heat shrink tubing to insulate any exposed wire connections to prevent short circuits.
  4. Safety Check:
    • Before using the 48-volt battery bank, double-check all connections, tighten any loose connections, and make sure there are no exposed wires.
  5. Charge and Monitor:
    • Charge the 48-volt battery bank using a compatible charger. Regularly monitor the state of charge and perform maintenance as necessary to ensure the batteries stay in good condition.

By following this series connection method, you can create a 48-volt battery bank by combining the voltage of four 12-volt batteries. This setup is commonly used in applications such as off-grid solar systems, electric vehicles, and industrial equipment where higher voltage is required.

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