Choosing a power unit for a small boat often becomes a compromise between power, weight and environmental friendliness. Boat electric motor 5 L with (quoted equivalent to gasoline equivalents of this power) provides the perfect balance for quiet fishing and maneuvering in hard-to-reach areas. Unlike noisy two-stroke engines, electric counterparts do not require fuel mixing, hardly vibrating or polluting water with exhaust fumes.
However, horsepower marking for electric motors is a conventional concept, as manufacturers often indicate traction in pounds (lbs). Understanding the ratio of these values is critical for the correct selection of equipment for your boat. Watts. and ramperes Here they play a much more important role than the usual "horses", determining the real dynamics and power reserve.
In this article, we will take a detailed look at the technical details, compare popular models and make a checklist for the season. real traction 70-80 lbs It is considered the optimal equivalent for replacing a 5-horsepower gasoline engine on a medium-sized PVC boat. Competent approach to the choice will avoid disappointments on the water and significantly prolong the life of an expensive traction battery.
Power conversion: from pounds of traction to horsepower
The first thing that a boater wants to do when they want to go electric is that there's no direct correlation between what they're doing with their horsepower and what they're doing with their electric motor. Electrical systems companies use pounds of thrust and watts of power. electric motor replace the gasoline unit in 5 hp, you need to refer to the physics of the process.
A gasoline engine with 5 hp typically produces about 3.7 kW of power. However, the efficiency of electric traction is much higher, and the absence of losses on the transmission and propeller allows you to get comparable dynamics at lower numbers. Usually, to replace the 5 hp "gasoline" is considered models with thrust from 70 to 95 lbs. maximum speed Electricity is often lower, but the trolling mode becomes perfectly smooth.
⚠️ Warning: Never choose an electric motor with a propulsion "back to" the weight of the boat, and a power reserve of 20-30% is needed to compensate for wind, current and wear of the battery in the cold season.
You also need to consider the voltage of the system, and these are the most common types of voltages that run from 24 or 36 volts, and using a 12-volt system to create a thrust equivalent to 5 hp would require huge currents, which would cause the wiring to overheat and the battery to discharge quickly. high-voltage (24B/36B) is the standard for high-power electric propulsion.
Selection criteria: traction, shaft and control
Having determined the necessary thrust, you should move to the design features. The length of lower unit (shaft) is a critical parameter that affects the efficiency of the propeller. If the propeller works too close to the surface, cavitation and loss of traction will occur; if too deep, water resistance will increase. For inflatable boats of standard transpranza height (about 38-40 cm), shafts 60-75 cm long are usually suitable.
The control system also varies, and the manual control is convenient for small boats where the angler sits close to the motor, but for a comfortable angler who can be in the nose or center of the boat, it is indispensable. foot-control or the presence of a pre-installation electric drive It's a remote control, and it allows you to free up your hands for the gear.
- 🔋 Type of attachment: transom clamp is suitable for most PVC boats, whereas mounting in a dead foul (through a hole in the bottom) requires hull preparation.
- 🌊 lower unit material: Stainless steel is stronger but heavier; composite materials are lighter and not susceptible to corrosion, but are afraid of hitting stones.
- 🎛️ Number of speeds: Modern models offer up to 5 forward and 3 backward speeds, as well as a turbo mode for short-term power increases.
And the weight of the engine itself is also important, because aluminum alloys reduce weight, which is especially important for inflatable boats, where every kilogram affects buoyancy and speed. Composite models They often weigh less than 10 kg, making them easily carried by a single person, unlike gasoline counterparts.
If you are fishing in shallow water, choose models with the possibility of lifting a screw or telescopic shaft to avoid getting stuck in the grass.
Mathematics of autonomy: batteries and operating time
The heart of any electric boat system is the battery, and it's the battery that determines how long you can spend on the water without recharging. For 5 hp motors, conventional starter car batteries are not exactly the right fit — they are designed for short-term high-current returns and quickly degrade at deep discharge.
Specialized services should be used traction Deep Cycle: They can deliver low-current energy over long periods of time and withstand hundreds of charge-discharge cycles, most popular with AGM, GEL, and LiFePO4 (lithium-iron-phosphate), which, despite their high cost, provide twice as much operating time at the same weight.
| Type of AKB | Capacity (Ah) | Weight (kg) | Average operating time (max. speed) |
|---|---|---|---|
| AGM (Lead Acid) | 100 AH | ~30 kg | 1.5 - 2 hours |
| GEL (Gel) | 100 AH | ~29 kg | 2 - 2.5 hours |
| LiFePO4 (Lithium) | 100 AH | ~11 kg | 3.5 - 4.5 hours |
| LiFePO4 (Lithium) | 200 AH | ~22 kg | 7-9 hours |
The calculation of the operating time is made by dividing the battery capacity by the current consumption of the motor. For example, an 80 lbs motor at maximum speed consumes about 40-50 Amps at 24 volts. Consequently, a 100 Ah battery will run out in about 2 hours. However, on fishing, maximum gas is rarely used; by 30-40% of the power consumption falls to 10-15 Amps, which greatly increases the power consumption. autonomy.
How to extend the life of the battery?
Don't discharge lead batteries below 50% and lithium batteries below 10%. Always keep the batteries fully charged in a cool place. Using the Battery Management System (BMS) in lithium batteries will automatically protect against overdischarge and overheating.
Comparison of popular brands and models
The market for electric outboard motors is represented by several key players, each of which offers its own solutions for replacing 5-horsepower gasoline units. Min KotaThe Ulterra and Fortrex series set the standard for reliability and functionality, and their engines are characterized by quiet operation and advanced i-Pilot anchoring systems.
Chinese manufacturers, such as Haswing and FladenOsapian or Cayman models often copy the leaderboard design, providing similar traction specifications for half the price, and for a beginner or weekend fisherman, this can be the optimal entry into the world of electric motors without unnecessary costs.
- ⚓ Min Kota Endura C2 80: Classic genre, time-tested, simple mechanics, reliable clamp.
- 🚀 Haswing Cayman B 12V/24V: Excellent price-quality ratio, the presence of a trolley in the kit at some dealers.
- 🇷🇺 Waterman Pro: Localized assemblies adapted to our conditions, availability of spare parts.
When choosing a brand, it is important to consider not only the price, but also the availability of service. Electric motor The device is complex, and the presence of sealed glands that require replacement or specific electronics can become a problem in remote regions. Motor Guide They are also worth noting for their compactness and ergonomics.
☑️ Pre-purchase check
Installation and preparation for the first launch
Installing an electric motor on a boat requires care and safety, and unlike a gasoline-powered unit, an electric unit doesn't require exhaust ventilation, but it's afraid of the water in the electric circuits. battery-chamberThe battery must be securely fixed to prevent the center of gravity from shifting and the terminals from short circuit.
The motor and battery are connected by sea cables of at least 10-16 mm2 (depending on the length and current) and thin wires will cause a voltage drop and heat. A safety lock or circuit breaker is installed on the plus wire, designed for maximum motor current plus 20% of the reserve, which will protect the boat from fire in the event of a breakdown.
⚠️ Warning: Before first turning on, make sure that the propeller is fully submerged in water. Dry operation of the motor for even a few seconds can damage the oils and bearings.
After mechanical attachment and electrical switching, you need to check the control system. Scroll the screw with your hand (with the power off!) to make sure that there are no jamming. The first run is better done at minimum speeds, controlling the heating of the terminals and no extraneous noise. Adjustment of the depth of immersion The screw is carried out experimentally: if the screw is a funnel of air, lower the engine below.
Proper installation and calibration of the depth of the screw immersion increases the efficiency of the engine by 15-20% and reduces noise.
Service and extension
Electric motors require minimal but regular maintenance, and the main enemy of the mechanism is sand and dirt, which abrasively affect the moving parts. After every fishing trip, especially in salt water, the unit must be rinsed with fresh water. lower unit and the exit point of the shaft.
Once a season, it is recommended to carry out prevention: lubricate mobile compounds with silicone lubrication, check the condition of the osteoils and clean the contacts. Lithium batteries can be stored half-discharged, while lead batteries can be stored in half-discharged. AGM/GEL battery Requires constant charge maintenance through a smart charger, and storage of a discharged lead battery leads to sulfation of the plates and irreversible loss of capacity.
In winter, it is better to store the engine in a warm dry room. If this is not possible, make sure that there is no moisture inside the body, which can damage plastic elements when frozen. Regularly checking the tightening of the screws of the mounting of the rooster and lower unit will help to avoid unpleasant situations on the water, when vibration can weaken the connections.
Can an electric motor be used against a strong current?
Yes, motors with thrust from 70-80 lbs (the equivalent of 5 hp) are able to overcome moderate currents. However, energy consumption increases by 3-4 times. For rivers with fast currents, it is recommended to have a thrust reserve or reduce speed.
Which battery is better: lithium or gel?
Lithium (LiFePO4) is lighter, lasts longer (2000+ cycles) and gives off full capacity; gel is cheaper, heavier and afraid of deep discharge; For frequent use of lithium, it is economically more profitable in the long run.
Do I need to register a boat with an electric motor?
In Russia, boats weighing up to 200 kg and an engine up to 8 kW (about 10 hp) are not subject to registration. the 5 hp electric motor (about 3-4 kW) fits into these norms if the total weight of the boat with equipment does not exceed 200 kg.
What to do if the motor is dropped in the water?
Remove immediately, rinse with fresh water and dry. Don't try to turn on! Let dry for at least 2-3 days in the heat. Before turning on, check the insulation resistance if possible.