Kayak Trolling Motor: What Size, Mount and Battery You Need

A kayak trolling motor is a small 12 V electric motor, usually 30 to 55 lb of thrust, mounted on a stern bracket or a bow plate so you can cover water and hold position without paddling. The motor is the easy part: almost any kayak needs the smallest one made. The battery, the mount and your state’s registration rule are where the real decisions are.

What size trolling motor does a kayak need?

A 30 lb motor is enough for almost every fishing kayak. Minn Kota’s sizing rule asks for at least 2 lb of thrust per 100 lb of fully loaded weight, people and gear included.

Work it through for a typical setup:

At 2 lb per 100 lb, that kayak needs about 7 lb of thrust. A 30 lb motor gives four times that, which leaves margin for wind and current. A bigger motor will not make a kayak much faster: a displacement hull has a natural top speed set by its waterline length (the naval-architecture rule of thumb is 1.34 x the square root of the waterline length in feet, in knots, about 5.3 mph for a 12 ft kayak), and past that point extra thrust mostly turns into wake and amp draw. Choose 45 to 55 lb only if you fish strong river current or tide.

Which kayak trolling motors can you buy?

Prices run from $169.99 for a hand-steered transom motor to about $1,600 for a GPS bow-mount motor. Prices and specs below come from the makers’ US stores on 2026-10-06, except the Kayak Terrova price, read at Tackle Warehouse on 2026-11-06.

The Kayak Terrova was listed out of stock on Minn Kota’s store on 2026-10-06, and Minn Kota also sells a saltwater Riptide Kayak Terrova. The Newport HD motors are closer to small electric outboards than trolling motors: the NK180 HD needs a 24 V LiFePO4 battery, which is a different and heavier power system. Electric outboards are compared with trolling motors in electric boat motors. For the bow vs stern decision on bigger boats, see bow mount vs transom mount trolling motors.

How do you mount a trolling motor on a kayak?

Most kayak motors go on a stern bracket; GPS bow motors need a kayak with a bow mounting area built for them.

• Stern or transom bracket. A transom motor such as the Endura clamps to a flat board or plate. Many fishing kayaks have a molded motor mount area or accept an aftermarket bracket on their gear tracks. Check the kayak maker’s accessory list first.
• Bow mount. Pulling from the front tracks better in wind, and a remote-steered GPS motor removes the tiller problem entirely. The Kayak Terrova is designed for this.
• Shaft depth. Minn Kota recommends submerging the center of the motor at least 12 inches. On a kayak that sits low in the water, a 30 inch shaft is common; measure from the mount to the waterline before you buy.
• Steering. A hand tiller sits behind you on a stern mount, so plan on a tiller extension, a rudder system or a remote-steered motor.

Wire it with a breaker close to the battery. Minn Kota’s chart specifies a 50 A breaker and 10 AWG wire for a 30 lb motor at a 5 ft extension, and a 60 A breaker and 8 AWG for a 55 lb motor at 5 ft; the full table is in trolling motor wiring.

What battery does a kayak trolling motor need, and how long will it last?

A 50 to 100 Ah LiFePO4 battery is the usual choice, because it gives the most runtime per pound and a kayak has little room for weight.

From the System Planner: Minn Kota’s published max draw, current scaled with thrust to the 1.5 power for a variable-speed motor, 80% usable for LiFePO4 and 50% for AGM, with a Peukert correction. Battery weights are typical per-amp-hour averages, not a specific product. Model figures, not bench tests.

Two caveats matter on a kayak. First, the model assumes a variable-speed (PWM) controller. A 5-speed motor like the Endura draws more at its low settings than the model predicts, so treat the table as best case. Second, dropping to quarter throttle stretches runtime a lot: the same 30 lb motor at 25% draws about 3.8 A in the model and runs about 10.5 hours on 50 Ah of LiFePO4. Most kayak anglers motor to a spot, then fish slowly.

If 4 hours of motor time is the target, the planner asks for about 57 Ah of LiFePO4 or 92 Ah of AGM with the 30 lb motor at half throttle. Why lithium usually wins here, and when it does not, is covered in lithium vs AGM marine batteries; the general sizing method is in the trolling motor battery guide.

Do you have to register a kayak once you add a motor?

In most US states, adding any motor, electric included, turns a kayak into a motorized vessel that must be registered.

Texas is a clear example. Texas Parks and Wildlife exempts non-motorized canoes and kayaks from registration, then states that “adding an outboard or trolling motor to any of these vessel types negates the exemption.” Many other states apply the same logic, but the details, fees and decal rules differ. Check your state boating agency before you launch, and check the water body too, since some lakes restrict motors entirely. This is a pointer to the law, not legal advice. Canoes fall under the same rule; their mounts, thrust and battery placement are covered in canoe trolling motors.

Should you buy a GPS kayak motor with Spot-Lock?

Buy one if you fish structure in wind or current and hate re-anchoring; skip it if you mostly troll open water. A GPS motor like the Kayak Terrova holds the kayak on a waypoint, follows a recorded path and steers from a remote, which on a kayak frees both hands for the rod. The cost is about nine times a basic transom motor, plus a heavier bow setup. How GPS anchoring works, and how the brands compare, is in spot-lock trolling motors.

Who should not put a trolling motor on a kayak?

Skip the motor if you paddle waters that ban motors, if your kayak has no solid mounting point, or if registration and a second battery outweigh the paddling you would save.

• Light recreational kayaks without a stern plate, gear tracks or a maker-approved motor mount give a clamped motor nothing solid to push against.
• Anglers who launch in surf or shallow, rocky rivers risk the prop and shaft on every trip.
• Short-trip paddlers may find that a $170 motor, a $300-plus lithium battery, a charger and a registration fee cost more than the time they save.

A kayak fish finder is often the better first upgrade; see kayak fish finders for picks, transducer mounting and a small separate battery that keeps the sonar running if the motor battery runs flat. We have not tested these motors; figures come from the makers’ published specifications and prices checked on 2026-10-06.