12V, 24V, 36V: Which Trolling Motor System Is Right for You?

Why 12 Volts?

The story of why your car battery is 12 volts — and why your trolling motor probably is too — begins with a man named Alessandro Volta and a stack of copper and zinc discs in the year 1800.

Volta's Voltaic Pile, the first battery, produced roughly 0.76 volts per cell. (The unit "volt" was named after him, posthumously, in 1861.) Volts are a measure of electrical pressure — the force that pushes electrical current through a circuit. The higher the voltage, the more pressure; the more pressure, the more current can be pushed through a given resistance, and the more work can be done.

A single lead-acid cell, of the kind Gaston Planté invented in 1859, produces approximately 2 volts. To get higher voltages, you connect cells in series — the positive of one cell to the negative of the next — and the voltages add up. Six lead-acid cells in series give you 12 volts. That's why a "12-volt car battery" is internally six 2-volt cells wired together in a single case.

The 12-volt standard emerged in the early 20th century, when the automotive industry — led by Cadillac in 1912 — settled on 12V as the electrical standard for cars, replacing the weaker 6V systems that had struggled to start engines in cold weather. 12V became the universal standard: cars, trucks, RVs, boats, and eventually trolling motors all adopted it, because the infrastructure (alternators, chargers, accessories) was built around it.

When O.G. Schmidt built the first Minn Kota trolling motor in 1934, he designed it to run on a standard 12V car battery — because that's what everyone had. For decades, 12V was all there was.

But as trolling motors grew more powerful, 12V hit a wall. And the reason is one of the most important — and least understood — principles in all of electrical engineering.

The Law That Decides Everything: Ohm's Law

In 1827, a German physicist named Georg Ohm published a relationship that would define electrical engineering forever. Ohm's Law states:

Current (amps) = Voltage (volts) ÷ Resistance (ohms)

In a trolling motor, the "resistance" is mostly fixed by the motor's design. So the relationship between voltage and current is roughly linear: double the voltage, and you (roughly) double the current the motor draws.

Here's where it gets interesting. Power — the actual work the motor does, measured in watts — is voltage × current:

Power (watts) = Voltage (volts) × Current (amps)

So if you double the voltage, you double the current, and you quadruple the power. A 24V system doesn't just do twice the work of a 12V system — under the right conditions, it can do four times the work.

But there's a catch, and it's the reason higher-voltage systems exist at all: wire loss.

When current flows through a wire, some of the energy is lost as heat — proportional to the square of the current. This is why power companies transmit electricity over long distances at extremely high voltage: high voltage means low current for the same power, and low current means low heat loss in the wires.

On a boat, the same principle applies. A 12V system pushing 1,000 watts of power is carrying roughly 83 amps through the wires (1,000W ÷ 12V = 83A). That requires very thick, heavy wire to avoid overheating and significant voltage drop. A 24V system pushing the same 1,000 watts carries only 42 amps (1,000W ÷ 24V = 42A). A 36V system carries only 28 amps.

Lower current means:

Thinner, lighter wire (cheaper, easier to route)

Less heat loss in the cables

Less voltage drop over distance

Smaller, lighter connectors and switches

This is why, as trolling motors grew more powerful in the 1970s and 80s, manufacturers moved to 24V and 36V systems — not because 12V couldn't deliver the power, but because delivering that power at 12V required wiring so heavy it was impractical on a small boat.

The Three Systems Compared

Here's the practical breakdown:

System	Voltage	Max Typical Thrust	Batteries (Lead-Acid)	Batteries (LiFePO4)	Best For
12V	12V	~55 lbs	1 × 100Ah+	1 × 50–100Ah LiFePO4	Small boats, kayaks, occasional use
24V	24V	~80 lbs	2 × 100Ah in series	1 × 24V LiFePO4 or 2 in series	Mid-size fishing boats, serious anglers
36V	36V	100–112+ lbs	3 × 100Ah in series	1 × 36V LiFePO4 or 3 in series	Large bass boats, tournament rigs

12V Systems

Pros: Simplest wiring, cheapest, lightest, one battery, works for most small boats and casual use

Cons: Caps out around 55 lbs of thrust; high-current draw at full power means thicker wires and more heat loss; not enough for large boats or windy conditions

Best for: 12–16 foot boats, kayaks, canoes, pontoon tenders, casual weekend anglers who fish in calm conditions

24V Systems

Pros: Supports 55–80 lbs of thrust; lower current per watt means cooler, more efficient operation; the sweet spot for most serious anglers

Cons: Requires two batteries (or a single 24V lithium pack); more cost and weight than 12V; slightly more complex wiring

Best for: 16–18 foot fishing boats, anglers who fish in wind and current, the majority of serious recreational boaters

36V Systems

Pros: Supports 80–112+ lbs of thrust; lowest current draw per watt; the standard for tournament-level power

Cons: Three batteries (or a 36V pack); significant cost and weight; overkill for most recreational boats

Best for: 18+ foot tournament bass boats, heavy rigs, anglers who need maximum thrust and runtime

Series Wiring: How It Works

If you're running a 24V or 36V system with multiple 12V batteries, you wire them in series: the positive terminal of battery 1 connects to the negative terminal of battery 2, and the remaining positive and negative terminals connect to the motor.

In series:

Voltages add: 12V + 12V = 24V (or 12V + 12V + 12V = 36V)

Capacity (Ah) stays the same: two 100Ah batteries in series give you 24V at 100Ah, not 200Ah

This is different from parallel wiring, where you connect positive to positive and negative to negative. In parallel:

Voltage stays the same: two 12V batteries in parallel give you 12V

Capacity adds: two 100Ah batteries in parallel give you 200Ah

Most trolling motor systems use series wiring (to get higher voltage). Some anglers run parallel banks (to increase runtime at 12V), but this is less common now that lithium batteries offer more capacity per pound.

A Warning on Series Wiring

When wiring batteries in series, the batteries must be:

Same chemistry (don't mix lead-acid and lithium)

Same capacity (100Ah with 100Ah, not 100Ah with 50Ah)

Same age and condition (a new battery in series with an old one will imbalance the bank and damage both)

This is also why integrated 24V and 36V lithium packs (a single battery case containing internally-series-wired cells, with a single BMS managing the whole pack) have become popular — they eliminate the risk of mismatched individual batteries.

The Lithium Factor

Lithium has changed the voltage-system calculus. Here's why:

With lead-acid, a 36V system meant three 100Ah batteries — roughly 225 pounds of lead, taking up significant bow or stern storage. The weight and space penalty was real, and many boaters avoided 36V for that reason.

With LiFePO4, a 36V 100Ah pack weighs roughly 60–70 pounds — less than a single lead-acid battery — and is far more compact. The weight and space penalty that once pushed people toward lower-voltage systems has largely disappeared.

This means the practical ceiling for trolling motor thrust has risen. Systems that were impractical with lead-acid are now feasible with lithium — which is why we're seeing more 36V motors and even 48V systems entering the market.

Choosing Your System: The Decision Tree

What's your total loaded boat weight?
- Under 1,500 lbs → 12V is sufficient
- 1,500–3,000 lbs → 12V or 24V (24V if you fish wind/current)
- 3,000–5,000 lbs → 24V (36V if you want maximum runtime)
- Over 5,000 lbs → 36V

Do you fish in wind over 10 mph or in current?
- Yes → step up one voltage tier

How long are your days on the water?
- Half-day casual → 12V is fine
- Full-day serious → 24V (more efficient, better runtime)
- Tournament 10-hour days → 24V or 36V

What's your budget?
- 12V system (motor + 1 battery): lowest cost
- 24V system (motor + 2 batteries or 1 24V pack): ~50% more
- 36V system (motor + 3 batteries or 1 36V pack): ~100% more than 12V

Most serious recreational anglers on 16–18 foot boats land on 24V — it's the sweet spot of thrust, efficiency, and cost. 12V is right for smaller boats and casual use. 36V is for tournament rigs and large boats.

Where BateriaPower Comes In

At BateriaPower, we're developing electric trolling motors and bow-mounted thrusters across the 12V, 24V, and 36V ranges — because we know there's no single right answer for every boater.

We're engineering each system for honest performance: thrust ratings you can sustain for a full day, voltage systems matched to real-world boats, and battery integration that makes the most of lithium's advantages. We're designing for the boater who wants the right system for their boat — not the most expensive system, and not a system that's undersized for the conditions they actually fish.

Whether you need a 12V motor for your 14-foot aluminum boat, a 24V system for your weekend rig, or a 36V thruster for tournament days, we're building options that deliver professional performance at a price that respects the boater.

Join the BateriaPower waitlist to follow our development of electric propulsion across all three voltage systems — and be among the first to know when they're ready.