Choice electric-engine For a boat, it's a solution that's fundamentally changing the way we fish and get out on the water. Silence, no vibrations, no gasoline smell, no complex maintenance, make electrics the perfect option for trolling or manoeuvring in restricted areas. But the variety of models on the market can baffle even the experienced boater.
Many beginners make the mistake of buying a device with insufficient thrust or an inappropriate length of lower unit, which leads to cavitation and rapid discharge of the battery. To avoid disappointment, you need to clearly understand the specifications and operating conditions. Which electric motor is better for a boat? It will be exactly for your tasks.
With modern technology, we can build compact units with high efficiency, and a properly designed power plant will last for years with minimal maintenance, and let's identify the key parameters that we should look at first.
Calculation of the required thrust and engine power
The first thing to do before buying is to determine the required traction It is not a horsepower, but the force with which the propeller pushes the boat forward, measured in pounds (lbs). There is a common rule: for every 45 kg of total weight (boat + motor + battery + equipment + passengers), 1 pound of thrust is required for a comfortable ride.
But that's a basic calculation. If you're planning to catch on the current, against the wind, or use a heavy metal boat with a flat bottom, you need to increase your power reserve. For strong current or wind conditions, the stock ratio must be at least 30-40% of the calculated weight. The use of the motor at the limit of possibilities will lead to overheating of the windings and a sharp drop in battery life.
It's important to distinguish between maximum and cruising thrust. The engine can give short-term peak values, but long-term operation is possible only at 70-80% of the maximum. When choosing between two models, always take the one that is more powerful, if the budget and the weight of the battery allows.
Consider the dependence of thrust on the type of boat in the table below:
| Type of craft | Recommended traction (lbs) | Voltage (B) | Features |
|---|---|---|---|
| Inflatable boat (PVC) up to 3.5 m | 30 - 40 | 12 | Compact, lightweight |
| Aluminum boat 3.5 - 4.5 m | 50 - 60 | 12 - 24 | We need a wind reserve. |
| Boat with hull up to 5 meters | 70 - 80+ | 24 - 36 | Multivolt systems only |
| Heavy boats and yachts | 100+ | 36 - 48 | High current consumption |
Control types: tiller, pedals or GPS
The second critical parameter is the way you drive, which is how you can fish and how you can control the boat in different situations, and there are three main types, each of which has its own advantages for different use cases.
The rumpling is the classic and most common: the fisherman turns the handle of the motor, setting the direction. Minn Kota Endura or Haswing CaymanThey have telescopic bumpers and can be mounted from any side. This is a reliable option, but it requires the user to constantly hold on to the bumper or use a lock.
The foot control (pedal) is ideal for spinning riders who need to keep their hands free to handle the gear, and the pedal connects to the motor with a cable and allows you to react instantly to a bite or change of course, but pedals require free space in the cockpit, which is not always possible on small PVC boats.
Secrets of GPS anchor
The GPS anchor system allows you to lock the boat to a point with an accuracy of a meter, despite the wind and current. The motor automatically steers, compensating for demolition, an indispensable feature for fishing at great depths or catching a particular driftwood.
The most advanced option is to manage through GPS navigation And these are wireless remotes, which allow you to program your route, you can get anchored, you can control your motor from your smartphone, and while this increases the cost of the kit, it's a better investment for professional fishing.
The length of the lower unit and the method of installation
The wrong length of the lower unit is a common cause of problems. If the screw is too close to the surface of the water, cavitation (air capture) will occur, leading to noise, loss of traction and damage to the blades. If too deep, water resistance will increase and efficiency will decrease.
The optimal position is when the propeller is 15-20 cm below the water level in the calm state of the boat. When moving, the bow of the boat can be uplifted, so the reserve length is mandatory. Standard dimensions range from 24 inches (60 cm) for inflatable boats to 48 inches (120 cm) and more for high transom boats.
When installing the motor on the PVC transom of the boat, use a special adapter board if standard mounting is not enough, this will ensure the vertical position of the lower unit and the correct operation of the screw.
The way you install it also influences your choice. transom motors are attached to the rear and are versatile. Bow mount motors require a special fastener and often have a power-dive system. Inflatable boats have special installation pads attached to stringers.
It is important to consider the angle of inclination. Most models allow you to adjust the angle of immersion, but when installed on an inflatable boat with a soft bottom or without a hard transom, additional fixation may be required so that the engine does not peck with the nose when driving.
Power systems: 12, 24 or 36 volts
The voltage of the on-board network directly affects the current strength and therefore the thickness of the wires and the heating of the system. Low-power motors up to 50-55 pounds of thrust usually run from 12 volts. This is convenient, since one standard battery is enough.
More powerful units require 24 or 36 volts, and this is achieved by connecting two or three 12-volt batteries in series, respectively, and switching to higher voltages reduces current at the same power, reducing wire losses and engine heating.
⚠️ Attention: Never connect a 12-volt motor to a 24-volt or 36-volt network. An instantaneous surge in voltage will render the electronic control board inoperable without recovery. Always check the markings on the lower unit before connecting.
For 24B and 36B systems, it is critical to use batteries with the same specifications, age and wear. An imbalance in the cans will cause one battery to run out faster than others, and the system will stop working even if the others still have a charge.
Battery selection and battery life
The heart of the electric motor is the battery, and the use of battery starters is strongly discouraged, because they are not designed for long-term energy output by low currents and quickly fail. traction (Deep Cycle) such as AGM, GEL or lithium (LiFePO4).
Battery capacity is measured in Ampere-hours (Ah). To calculate the running time approximately, you need to know the current consumption of the motor at a specific speed. Usually manufacturers indicate that a 30 lbs motor consumes about 30 Amps at maximum speed. Consequently, a 100-Ah battery will provide approximately 3 hours of full-gas running.
☑️ Check before purchasing AKB
Lithium batteries (LiFePO4) are becoming the new standard: they are 2-3 times lighter than lead, have 5-10 times more charge-discharge cycles, and give full capacity even at high discharge currents. Despite their high initial cost, they are more profitable in terms of life.
Remember the charger. AGM and GEL need different charge modes, and lithium needs special BMS-compatible chargers, charging by eye or cheap Chinese devices will shorten the life of an expensive battery.
Overview of popular brands and models
The boat electric motor market is divided among several key players, traditionally the leader is the American company. Minn Kota (Johnson Outdoors) Their model series Endura and Ulterra They're known for their strength, their excellent cooling system, and their wide range of accessories.
European brand MotorGuide (a subsidiary of Mercury Marine) offers a great alternative: their engines are often quieter than their counterparts and have a unique alternating current (Xi5) system, which reduces noise and vibration, but maintenance and finding parts can be more difficult than that of the Minn Kota.
In the budget segment, Chinese brands, such as Haswing and WatersnakeThey offer top-end features (including GPS) for half the price. Material quality may be inferior to the leaders, but for amateur fishing 10-15 days a season is a great choice.
When choosing a brand, focus not only on price, but also on the availability of service centers in your area. Electric motor is a complex mechanism, and the possibility of warranty repairs is more important than saving 20%.
When buying, you should pay attention to the presence of a built-in voltmeter, charge indicator and protection against overheating. Some models have built-in chargers, which is very convenient in field conditions.
Frequently Asked Questions (FAQ)
Can an electric motor be used as the main motor for long-distance transitions?
Theoretically, you can if you have a powerful traction battery (200+ Ah) and a high-thrust motor. However, the speed of the electric motor usually does not exceed 5-7 km / h. For transitions of 10-20 km this is acceptable, but for longer distances it is better to have a gasoline engine as the main one, and use the electrician for quiet running.
Is the electric motor afraid of water and can it be dropped?
Electric motors have IP67 or IP68 protection, which allows them to operate in a submerged state, but they are not worth dropping: the propeller blades, the lower unit (especially if it is telescopic) can damage, or the leakiness of the glands is disturbed. After each fishing, it is advisable to rinse the engine with fresh water, especially after use in the salt sea.
How to extend the life of the battery?
Never keep the battery completely discharged. After fishing, it must be put on charge. In winter, lead batteries must be recharged every 1-2 months, and lithium can be stored at a charge of 50-60% in a cool place. Avoid deep discharge below 20%.
Do I need to register a boat with an electric motor?
In Russia, boats weighing less than 200 kg (including the engine) and engine power up to 8 kW (about 10 hp) are not subject to registration in GIMS. Since electric motors are much lighter than gasoline and their power is usually less than 1 kW, most kits (PVC boat + electric motor) do not require registration and rights. However, the rules may change, so it is worthwhile to clarify the current legislation.
⚠️ Attention: When transporting a boat with the engine installed, always remove the battery and disconnect the terminals. Accidental contact or switching on the trailer can lead to a break in the gearbox or injury.
Choosing an electric motor is a balance between power, weight and budget. With the type of boat and fishing style, you can choose the perfect unit that will make your vacation comfortable and productive. Remember that saving on a battery or a lower unit length can negate all the benefits of electric traction.