When building an energy storage system, one of the most common questions is: How can I increase the voltage of my LiFePO4 batteries? The answer is wiring batteries in series. This method is widely used in solar systems, RVs, golf carts, and marine applications to achieve higher voltage and better efficiency.

In this guide, we will explain:

• What wiring batteries in series means

• How to wire LiFePO4 batteries in series safely

• Why series wiring is important for modern applications

• Practical tips and precautions

What Does Wiring Batteries in Series Mean?

Wiring in series refers to connecting multiple batteries end to end. Specifically, the positive terminal (+) of one battery is connected to the negative terminal (–) of the next battery.

• Voltage increases: All battery voltages are added together.

• Capacity stays the same: The amp-hour (Ah) rating does not change.

👉 Example:
Two 12V 100Ah LiFePO4 batteries in series = 24V 100Ah.
Four 12V 100Ah LiFePO4 batteries in series = 48V 100Ah.

This setup is different from parallel wiring, where capacity increases but voltage remains constant.

How to Wire LiFePO4 Batteries in Series

Follow these steps to wire your LiFePO4 batteries in series:

1. Check Battery Compatibility

• Use the same brand, model, voltage, and capacity.

• Ensure all batteries are at the same state of charge (SOC).

2. Verify BMS Support

• Many LiFePO4 batteries include a Battery Management System (BMS).

• Confirm that the BMS allows series connection (e.g., 2S, 4S).

3. Prepare the Setup

• Place the batteries in a safe, dry, and ventilated area.

• Use high-quality cables and connectors rated for the current.

4. Make the Connections

• Connect positive (+) of the first battery → negative (–) of the second battery.

• Continue until all batteries are connected.

• The free negative terminal and positive terminal are the system outputs.

5. Measure and Confirm

• Use a multimeter to check the total output voltage.

• Example: Four 12V batteries should measure about 48V.

6. Secure the System

• Tighten connections and label terminals clearly.

• Add fuses or circuit breakers for protection.

Why Wire LiFePO4 Batteries in Series?

There are several key advantages:

1. Higher Voltage for Greater Efficiency

• Higher voltage reduces current flow.

• Less current = lower heat, reduced losses, thinner cables.

2. Compatibility with Inverters and Equipment

• Most inverters, solar charge controllers, trolling motors, and RV appliances require 24V, 36V, or 48V input.

• Series wiring ensures your battery bank meets these requirements.

3. Scalability

• Start with two batteries for 24V.

• Expand to four batteries for 48V.

• Flexible design for different applications.

4. Reliable Performance in Demanding Applications

• RVs, off-grid homes, golf carts, and marine systems need stable voltage.

• Series LiFePO4 battery banks deliver consistent power for high-demand loads.

Safety Tips for Series Wiring

When wiring batteries in series, follow these precautions:

• 🔋 Charge all batteries fully before wiring

• ⚡ Never mix old and new batteries

• 🛠️ Use a proper BMS or packs designed for series use

• 🔍 Check voltage balance regularly

• 🔌 Disconnect power before adjustments

Common Questions About Series Wiring

Q1: Can I wire LiFePO4 and lead-acid batteries together in series?
No. Mixing chemistries is unsafe and will damage the batteries.

Q2: What happens if one battery fails in series?
The entire system may shut down or lose efficiency. Always replace with a matched battery.

Q3: How many 12V LiFePO4 batteries can I connect in series?
Most manufacturers allow up to 4 in series (48V), but always check the specification.

Wiring batteries in series of LiFePO4 battery is the best way to achieve higher voltage systems like 24V or 48V while keeping capacity the same. This method improves efficiency, supports high-power devices, and makes your energy system more scalable.

By following proper steps—using matched batteries, checking BMS compatibility, and applying safety precautions—you can build a reliable LiFePO4 battery bank that powers your RV, solar system, or off-grid home with confidence.

If you are looking for a future-ready energy solution, wiring LiFePO4 batteries in series is the key to unlocking higher performance and efficiency.