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One Pack or Three? Choosing the Right Trolling Motor Battery Setup

When it comes to powering your trolling motor, there's more than one way to get the job done. Some anglers prefer the traditional setup of multiple batteries wired in series, while others are making the switch to a single lithium battery pack. For those looking for additional capacity, running two compatible batteries in parallel is another option.

So, which setup is right for you?

Whether you're upgrading your current system or rigging a new boat, understanding the differences can help you build a setup that matches how you fish.

1. Three 12V Batteries in Series: The Traditional Setup

One of the most familiar ways to power a 36V trolling motor is by connecting three 12V batteries in series.

When batteries are connected in series, their voltages add together while their amp-hour capacity stays the same.

For example, three 12V 100Ah batteries wired in series create a 36V 100Ah system.

Why do anglers choose this setup?

• Individual battery replacement: If a battery develops an issue, individual batteries can be tested and replaced rather than replacing an entire single-pack system.

• Familiar configuration: Many boats are already equipped for multiple 12V batteries.

• Flexibility: Anglers can build the voltage their trolling motor requires using compatible batteries approved for series operation.

For some anglers, having individual batteries provides additional serviceability and flexibility. However, it's important to remember that if one battery fails, it can interrupt the entire series circuit. Three batteries in series do not provide automatic backup power.

2. One 36V Battery: Simplify Your Setup

Looking for a cleaner, simpler battery compartment? A dedicated 36V lithium battery delivers the required voltage from a single pack.

Instead of connecting three separate 12V batteries, anglers can power their trolling motor with one battery designed for the job.

Why choose a single pack?

• Fewer connections: Reduce the number of cables and terminals in your trolling motor system.

• Cleaner installation: Simplify your battery compartment with fewer individual batteries.

• Simplified monitoring: Manage one dedicated trolling motor battery instead of three separate batteries.

• Potential space savings: Depending on the battery's dimensions, a single pack may free up valuable compartment space.

For anglers who value simplicity and want fewer components in their trolling motor system, a single-pack configuration is worth considering.

Keep in mind that runtime and weight savings depend on the specific batteries being compared. A single battery doesn't automatically provide more runtime than a series configuration.

3. Two 36V Batteries in Parallel: Build More Capacity

For anglers who spend long days on the water or want additional battery capacity, connecting two compatible 36V batteries in parallel offers another configuration.

Unlike series wiring, parallel connections maintain the same voltage while increasing total amp-hour capacity.

For example, two compatible 36V 60Ah batteries connected in parallel create a 36V 120Ah battery bank.

Why choose parallel?

• Additional capacity: Increase the total available amp-hours in your trolling motor system.

• Extended runtime potential: More usable energy can help support longer days on the water.

• Configuration flexibility: Build additional capacity using multiple compatible battery packs.

It's important to verify that your batteries are approved for parallel operation and follow the manufacturer's requirements for battery compatibility, charging and installation.

Parallel configurations should not automatically be treated as redundant systems. Whether a battery can be isolated after a fault depends on the battery management system and installation.