Choosing an electric outboard motor is a critical step in preparing for navigation, and the duration and comfort of your fishing or cruising is crucial. tractor It's designed to be able to run in low-current discharge for long periods of time, and if you're wrong about the type or the capacity, you're at risk of being left in the middle of the pond long before your scheduled return time.
The current market offers many solutions, ranging from the available lead-acid models to the advanced lithium-iron-phosphate systems. battery During operation, it will help you avoid premature failure of equipment, and a well-chosen engine-battery bundle will ensure stable traction and predictable behavior of the boat on the water.
In this article, we will discuss in detail the technical specifications, methods for calculating autonomy and the rules for the operation of various types of energy storage devices. You will learn why conventional car batteries are categorically not suitable for this task and how to properly service specialized batteries. traction-carryingThe right approach to choice will save significant money in the long run.
Principal differences of traction batteries from starter
The main difference is the design of the plates and the chemistry of the electrolyte. The starter batteries we're used to seeing in cars have many thin lead plates, which provide a huge contact area and the ability to instantly recoil hundreds of amperes to start the internal combustion engine. However, this design is extremely vulnerable to deep discharge: if you remove more than 20% of the capacity, the plates begin to collapse and crumble.
Traction batteries, by contrast, have fewer thicker plates, often with special alloying additives, which allows them to slowly and evenly release energy over long periods of time, withstanding hundreds of deep discharge cycles. Depth of discharge (DoD) These batteries can reach 80% or more without critical damage to life, making them ideal for electromobility and outboard motors.
⚠️ Warning: Installing a conventional starter battery on an electric motor will cause it to deteriorate rapidly, and after 10 to 15 deep discharge cycles, the battery will lose most of its capacity and become unusable.
Also, it's important to consider the operating conditions. On water, vibrations and tilts of the boat hull are common. Traction models often have a reinforced hull, other internal junction design that prevents short circuits when rolling. AGM or GEL The technology allows the battery to be completely sealed and safe even when rolling over.
The main types of batteries for water technology
Two main technologies dominate the water transport segment today: lead-acid (including AGM and GEL) and lithium (LiFePO4). AGM The Absorbent Glass Mats are the most popular because of their affordable price and proven manufacturing technology, where the electrolyte is bound in fiberglass separators, which excludes straits and allows you to work in any position.
Gel batteries (GEL) use a thickened electrolyte, which makes them even more resistant to deep discharges and vibrations, but they are extremely sensitive to charge modes. Overcharging or using an inappropriate charger can cause the shell to bloat and irreversible damage.
- 🔋 AGM Optimal balance of price and reliability, is not afraid of shaking, quickly charges.
- 🧪 GEL maximum depth of discharge, but requires precise charge voltage and is afraid of frost.
- ⚡ LiFePO4 Lithium-iron-phosphate batteries, lightweight, with a huge cycle life, but expensive.
Lithium batteries type LiFePO4 They're the pinnacle of evolution in this field, and they weigh 2 to 3 times less than lead at the same capacity, which is critical for inflatable boats, where every kilogram counts, and they give away almost 100 percent of their declared capacity, while lead boats only give away 60 to 70 percent of their efficiency to avoid damage.
Why is LiFePO4 more expensive when buying?
The high initial cost of lithium batteries is due to the complex management system of BMS and the cost of raw materials, but if you recalculate the price per charge-discharge cycle, lithium is 3-4 times more profitable than lead in the long run.
Calculation of the required capacity and time of autonomous operation
Determining the required capacity is a mathematical problem that must be solved before buying equipment. The current consumption of a boat electric motor depends on the chosen speed and the load on the screw. At maximum speed, the motor can consume 40-50 amps, whereas on an economical course it can only consume 5-10 amps. For planning fishing, usually focus on average consumption values.
To calculate the time of work, use the formula: Capacity (Ah) divided by Current consumption (A) equals Time (h). pakert For lead batteries, which says that when you run high discharge currents, the actual battery capacity decreases. For lithium batteries, this effect is virtually nonexistent, and they give off the passport capacity at almost any current.
| Motor type (thrust) | Medium current (A) | Operating hours from 100 Ah (AGM) | Operating time of 100 Ah (LiFePO4) |
|---|---|---|---|
| 30 lbs (about 360 watts) | 30 A | ~2 hours | ~3.2 hours |
| 40 lbs (about 480 watts) | 40 A | ~1.5 hours | ~2.4 hours |
| 55 lbs (about 660 watts) | 55 A | ~1 hour | ~1.8 hours |
When planning a power reserve, always leave 20-30% capacity It's going to save you in the event of wind or currents that are unforeseen, which can increase your energy consumption, and even if you're completely zero, you're not good for traction models, you're going to have to reduce their overall life.
For lead batteries, usable capacity is only 60-70% of the nominal value, while for LiFePO4, you can count on 90-95%.
Rules of charging and maintenance on water and in the off-season
Proper charging is the key to the longevity of your battery. Lead acid batteries require a three-stage charge cycle: primary charge, absorption and maintenance. Using simple chargers without microprocessor control can lead to undercharging (plate sulfation) or overcharging (boiling electrolyte). AGM and GEL Batteries must be selected with appropriate profile chargers.
Lithium batteries are equipped with built-in control system BMS Battery Management System, which self-balances cells and protects against overloads, however, they also prefer to use specialized chargers that will not supply voltages above 14.6V, which can cause an emergency BMS shutdown.
☑️ Daily maintenance of AKB
In the off-season, when the boat is in storage, lead batteries require special attention. They are subject to self-discharge, so they must be recharged every 1-2 months or kept on a special device in storage mode (see below).Storage ModeLithium batteries are much more convenient in this regard: their self-discharge is minimal, and they can be stored at a charge of 50-60% for several months without losing properties.
⚠️ Warning: Never store a fully discharged lead battery at negative temperatures. The electrolyte in the discharged state has a low density and can freeze, rupturing the body.
Protection from moisture, vibration and installation in the boat
The aqueous environment is aggressive not only to metal, but also to electrical contacts, even if the battery is sealed. IP67The oxidation of the contacts leads to a drop in voltage and heating of the connections. It is recommended to use special sprays-dielectrics or silicone lubricants to protect the connections, and also tightly close the terminal pads.
Battery attachment in the boat must be rigid and reliable. When moving along the wave, a battery weighing 20-30 kg becomes a dangerous projectile that can penetrate the side or injure the angler. Use special plastic boxes or metal brackets with reliable fixation. It is important to ensure ventilation, especially if you use batteries that are theoretically capable of gassing when recharged.
- 🛡️ Install the fuse on the plus wire as close as possible to the battery terminal.
- 🔩 Use wires with a margin of section to avoid a voltage drop over a long distance.
- 🌊 Lift the battery box above the bottom of the boat to exclude contact with water when slapping waves.
Special attention should be paid to wiring. The cable from the battery to the motor should be as short and thick as possible. Thin wires will warm, losing precious energy that should go to the propeller. For powerful motors (from 12V 50A and above), the wire cross section should be at least 10-16 mm2 (copper).
To protect the terminals from salt water (if fishing at sea or in estuaries), lubricate them with lithium lubricant or wear special plastic caps treated inside with anticor.
Cost of ownership comparison: lead vs. lithium
When you first look at the price tags in the store, the choice seems obvious: a lead battery costs 3-4 times less than a lithium counterpart. However, economic calculations only make sense taking into account the life and number of cycles. A lead traction battery can withstand an average of 300-500 discharge cycles to lose 50% of capacity, whereas a lead traction battery can withstand an average of 300-500 discharge cycles to lose 50% of capacity, whereas LiFePO4 It can easily go through 2000-3000 cycles.
Weight also has to be considered. To achieve the same autonomy on lead, you'll need a 30 kg battery, whereas lithium weighs only 10-12 kg. For lightweight inflatable boat owners, this is a significant argument that affects the load capacity and speed of assembly and disassembly of the kit, and in terms of one lithium cycle, it turns out to be more profitable.
If you fish rarely, a couple of times a month, and are not ready for a large one-time investment, high-quality fishing is a good idea. AGM The battery would be a reasonable trade-off, and it would last for several seasons with care, and for professionals and those who spend every weekend on the water, the investment in lithium would pay off in 2-3 years of active use.
Can a traction battery be charged with a conventional car charger?
Technically, it is possible to apply current, but it is highly recommended not to do it regularly. Car "chargers" often have a mode of desulfation with high currents or pulses, which can damage the delicate structure of traction plates or disrupt the operation of BMS in lithium batteries.
Which battery is best for winter fishing?
Lithium-iron-phosphate (LiFePO4) is preferred in winter, because it works better in the cold than lead. However, they can only be charged at a cooler temperature. Lead AGM batteries lose up to 40% of their capacity in the cold and become very fragile, but they can be charged in the heat. The main thing is not to leave them discharged in the cold.
Do I need to maintain traction batteries?
Airtight batteries (AGM, GEL, LiFePO4) are Maintenance Free (unmaintained) and cannot and should not be filled with water. The whole maintenance is about keeping the case clean, checking the tension of the terminals and timely charging. Breaching the tightness of the housing leads to the disposal of the device.
What happens if the electric motor stops developing its full power?
First of all, check the voltage on the battery terminals under load. If the voltage drops below 10.5V (for 12V system), then the battery is dead or has a defect in one of the cells. Also check the contacts: oxidation or poor contact gives the same effect as "subsidence" of voltage.