Operation of the vessel directly depends on the state of the onboard network, and the key element here is the battery. Marine environment Salt water, constant vibration, fuel and oil sprays can instantly disable expensive electronics or the power supply itself, which is why a competent boat owner, whether it is a PVC engine or a full-fledged boat, first of all thinks about a reliable battery container.
Purchase of specialized battery-box This is not just a whim, but a necessity dictated by the harsh reality of the operation of equipment on the water. According to the rules of GIMS, all batteries on small vessels must be protected from water and reliably fixed to avoid displacement during rolling. The market offers many options, but choosing a truly quality product that will last for years can be difficult without a deep dive into the technical details.
In this article, we will look at all aspects of choosing, installing and operating safety boxes, how plastic models differ from metal ones, why ventilation is important, and how to properly secure a structure so that it does not cause an accident, and we will also look at the common mistakes that beginners make when equipping their vessel.
Materials of manufacture: plastic or metal?
The first thing that customers face is the choice of the material of the case, and the vast majority of modern boxes are made of impact-resistant plastic, usually made from a high-impact plastic. polypropylene or ABS plasticThese materials are highly chemically resistant, do not corrosion from salt water and are capable of withstanding considerable mechanical stress. polymeric It will not crack when hitting the side and will not get wet from constant contact with moisture.
Metal boxes are less common and are painted or galvanized structures, their main advantage is the ability to self-manufacture to the non-standard size of the niche in the boat. However, the metal requires perfect painting and processing, as any scratch will become a focus. corrosionIn the long run, plastic benefits from a combination of factors: weight, cost and no maintenance.
It's important to pay attention to the thickness of the wall. Cheap models often have thin walls that can deform when fasteners tighten or heat up in the sun. A good box must keep in shape even when there is no internal strut.
- 🛡️ Impact resistance: the ability to withstand heavy objects falling.
- 💧 Moisture resistance: full tightness of the lower part of the body.
- ☀️ UV Stability: The material should not break down under the sun.
Critical design features
Just a box with a lid is not enough to protect the whole thing, and a quality box should be designed to drain gases, and when you charge, especially lead acid batteries, you get a discharge. rattle-gas If it accumulates in a confined space, it can explode when a spark occurs.
Therefore, the presence of ventilation holes in the upper part of the lid or on the sides (but protected from direct spray) is a requirement. valve or pipes for connecting a ventilation hose, which is especially important if the box is installed in a closed lock.
Why is ventilation important?
When the battery is charged, the water in the electrolyte is electrolyzed; the hydrogen released is lighter than air and rises upwards; without ventilation, the concentration of gas will reach an explosive concentration (from 4% in the air).
Another important element is the mounting system, which requires that the bottom of a quality box have special protrusions ("ears") or bolt holes, which allows the box to be rigidly fixed to the floor of the boat, eliminating its displacement even in case of severe excitement, and the absence of attachment turns a heavy box into a dangerous projectile that can damage the board or injure passengers.
- 🔋 Compatibility: the dimensions must correspond to the type of battery (55, 60, 75, 90 Ah).
- 🔌 Access to terminals: The cover should allow wires to be connected without removing the box itself.
- 🔒 Cover fixation: reliable latches or screws that exclude spontaneous opening.
Size and compatibility with batteries
Before you buy a box, you need to know exactly the dimensions of your battery. Standard car and boat batteries have different sizes. Most often, there are models of the BCI group (Battery Council International), for example, the group 24 or 27. Incorrectly selected size will lead to the fact that the battery will hang inside, which can damage the battery body and short circuit.
The table below shows the approximate dimensions of popular batteries and recommended internal dimensions of the boxes. Always leave a small margin (1-2 cm) in height for ease of extraction.
| Type size of AKB | Capacity (roughly) | Length (mm) | Width (mm) | Height (mm) |
|---|---|---|---|---|
| Group 24 | 70-85 Ah | 260 | 173 | 225 |
| Group 27 | 85-100 AH | 305 | 173 | 225 |
| Group 31 | 100-130 AH | 330 | 173 | 240 |
| European Standard | 55-65 AH | 242 | 175 | 190 |
Please note that some manufacturers are box-box This allows you to use the same box model for different battery sizes, which is very convenient if you plan to upgrade equipment in the future.
When measuring the battery, consider not only the body itself, but also the height of the terminals and the handle for carrying. Sometimes it is the handle that prevents you from closing the lid of a standard box.
Water Protection and Safety Requirements
The main function of boxing is to protect against water, but it is worthwhile to understand the difference between waterproof.waterproof) and water-resistant (water-resistantThere are practically no fully sealed battery boxes (due to ventilation requirements), so the design must be designed to allow water to enter but not flood the terminals.
⚠️ Warning: Never use conventional shipping containers without modification to install the battery in the boat. They have no ventilation and can cause gas explosions.
The cover should fit tightly to the body around the perimeter, often using a rubber seal or a special shape of the edges (see below).labyrinth), which prevents the penetration of spray even when the heel is strong, it is also important to check the quality of the material: it must not tan in the cold, otherwise the leakage will be disturbed.
The interior space must be dry and clean. If water does get inside (for example, during a boat wash or a strong storm), it must be removed immediately.
- 🌊 The height of the sides: should be sufficient to exclude the overlap of waves over the edge.
- 🧪 Chemical Resistance: The material should not react to the spilled electrolyte.
- 🔥 Fire Resistance: Materials with additives that make burning difficult are preferred.
☑️ Installation safety check
Rules of installation and installation DIY
Installation of the box is a process that requires carefulness. First, determine the place of installation. It should be easily accessible for maintenance, but away from fuel tanks and possible sparks (for example, engine starters), the floor of the boat at the mounting site should be flat and reinforced.
Use stainless bolts, washers and nuts to fasten the bolt. Normal ferrous metal will rust in one season. Under the head of the bolt, it is advisable to put a rubber washer for additional vibration. If the boat floor is wooden, make sure that the drilling sites are carefully treated with moisture retardants.
Sequence of action:1. Mark the holes under the fastener.
Drill holes (drill diameter = bolt diameter + 0.5 mm).
3. Treat the ends of the hole with sealant.
4. Set the box and insert the bolts.
5. Tighten the nuts through the washers.
Pay special attention to the laying of wires. They must pass through special holes in the drawer (if provided) or carefully exit from under the lid, without disturbing its tight fit. corrugated to protect the wires from rubbing on the edge of the plastic.
The main principle of installation is: "Seven times measure, one cut." An improperly drilled hole in the bottom of the boat is a risk of flooding, which cannot be corrected without serious repairs.
Common mistakes in selection and operation
One of the most common mistakes is to buy a drawer by eye, which results in the battery either not fitting in or floundering, and the second mistake is to ignite the ventilation, and some owners, fearing water, deliberately seal the holes, which is strictly forbidden.
⚠️ Warning: Do not place the box upside down or sideways unless designed. The electrolyte can leak out through the vents.
Regular maintenance is also often overlooked; it is periodically necessary to open the lid, check the electrolyte level (if the battery is serviceable), clean the terminals of oxides and remove condensate. Dirt and salt accumulated inside can create a conductive bridge between the terminals, causing self-discharge.
You don't have to skimp on quality by buying the cheapest Chinese thin plastics, and they often have a pungent smell that doesn't wear off for a long time, and they can crack when they hit you hard. battery-boxing It is an investment in the safety and durability of your equipment.
Frequently Asked Questions (FAQ)
Can I use a car box for a boat?
Technically, it can be as long as it's sizeable and ventilated, but car boxes often don't have a reinforced attachment to the floor, which is critical for a boat, and they can be less resistant to UV light.
Do I need to lubricate the terminals inside the box?
Use a special lithium lubricant or technical petroleum petroleum petroleum jelly to protect against oxidation, which in the humid conditions of the boat will prolong the life of the contacts.
What to do if the box is broken?
You can't operate a boat with a damaged box, it's a safety violation, you can use a thick plastic film temporarily for insulation, but you have to replace the box as soon as you can.
Is the box suitable for LiFePO4 batteries?
Yes, the dimensions are usually the same as lead batteries. However, lithium batteries are less demanding to ventilation, but protection from mechanical damage and water is just as important for them.