The Rhodan 24V vs 36V decision is about more than choosing a higher thrust number. Voltage affects battery count, charging equipment, cable planning, onboard space and total installation weight. Thrust requirements are also influenced by hull profile, displacement, windage and current—not only by boat length.

This guide compares the frequently considered Rhodan 80 lb vs 120 lb configurations and helps answer the question: What size Rhodan trolling motor do I need?

Rhodan 24V 80 lb vs 36V 120 lb at a glance

Battery type, capacity, cable size, breaker requirements and charger selection must follow the instructions for the exact motor and battery products being installed.

Choose according to boat demand, not length alone

Two boats with the same overall length can place very different demands on a trolling motor. A lightweight, low-profile vessel on protected water may require less thrust than a tall center-console carrying more fuel, equipment and passengers.

Evaluate the following before choosing a Rhodan 24V or 36V trolling motor:

• Loaded vessel weight: include fuel, batteries, water, gear and passengers.
• Windage: high bows, cabins and tops increase the force the motor must counter.
• Current: tidal flow and river current may require greater thrust reserve.
• Operating water: offshore chop creates different demands than protected freshwater.
• Shaft length: the propeller must remain submerged as the bow rises and falls.
• Expected runtime: battery capacity and motor usage influence practical time on the water.

When a Rhodan 24V 80 lb motor may make sense

A 24V 80 lb Rhodan trolling motor can be an appropriate choice when the vessel does not require the added thrust and battery footprint of a 36V system. It may be worth considering when:

• The boat is relatively light and has a lower bow profile.
• Fishing normally takes place in protected or moderately demanding water.
• Battery-compartment space is limited.
• The required shaft length is available in the desired 24V configuration.
• A properly sized 80 lb system provides sufficient control for the loaded vessel.

When a Rhodan 36V 120 lb motor may be preferable

A 36V 120 lb Rhodan trolling motor is often considered when the vessel or conditions require more thrust. The larger system may be the stronger candidate when:

• The boat is heavier when fully loaded.
• A high bow, hardtop or enclosure creates significant windage.
• The motor will regularly work against tide, river current or offshore conditions.
• Longer shaft options are required for a high-bow installation.
• Additional thrust reserve is important for reliable steering and position control.

Electrical requirements to plan before ordering

Battery bank

A conventional 24V system commonly uses two compatible 12V batteries in series, while a conventional 36V system commonly uses three. Batteries in a series bank should be compatible and selected as a complete system.

Marine battery charger

Choose a marine charger that supports the number, chemistry and specifications of the installed batteries. Do not assume an existing charger is compatible with a new battery bank.

Wiring and circuit protection

Cable gauge depends on current requirements, total circuit length and installation guidance. Use marine-grade components and the specified overcurrent protection for the exact motor configuration.

Battery location and weight distribution

An additional battery adds space and weight. Review ventilation, secure mounting, cable routing and vessel balance before committing to the larger system.

You can browse batteries, chargers, circuit protection, wire-management products and additional marine equipment through our marine parts and boat accessories categories.

Do shaft length and voltage need to be selected together?

Yes. First determine the shaft length needed to keep the lower unit submerged. Then confirm that length is offered with the appropriate voltage, thrust, color and model generation. A motor with the desired thrust is not the correct purchase if its shaft does not fit the boat’s bow height and operating conditions.

Frequently asked questions

Is 36V always better than 24V?

Not automatically. A 36V system offers more thrust in the configurations compared here, but it also requires a larger battery and charging installation. The correct system is the one matched to the boat’s real demands.

Can a 24V motor hold a boat with GPS Anchor?

It may, provided the motor is correctly sized for the loaded vessel, wind, current and conditions. GPS control cannot compensate for insufficient thrust or a propeller that repeatedly leaves the water.

What information should I provide before asking for a recommendation?

Provide the boat make, model and year; loaded weight if available; bow-to-waterline measurement; expected water conditions; battery preferences; desired shaft length; and details of any bow rails or mounting restrictions.