Extra Boat Battery Storage: Creative Solutions For Electronics

When it comes to boats, batteries are essential. But what happens when your battery runs out? This is where extra batteries come in handy. In this article, we will discuss the importance of having additional batteries on board and provide a step-by-step guide to installing them. We will also offer tips on maintaining your batteries to ensure optimal performance and longevity. By the end, you should feel confident in your ability to manage your boat's power supply effectively.

Battery boxes

When selecting a battery box, it is important to choose one that is made from durable, marine-grade materials. The box should be ruggedly constructed to withstand the harsh conditions at sea. One option is to use a polypropylene battery box, which is designed to securely hold batteries in place. These boxes are often available in different sizes to accommodate different battery types.

It is also important to consider the location of the battery box. Batteries should be kept in a cool, dry place, away from direct sunlight and extreme temperatures. The battery box should be easily accessible for maintenance and inspection. It is recommended to mount the battery box in a well-ventilated area, as batteries can emit explosive gases during charging.

When installing the battery box, it is crucial to follow safety guidelines. Batteries contain a significant amount of energy and can be dangerous if not handled properly. Always disconnect the batteries before performing any work and wear protective gear, such as safety glasses and gloves. Ensure that the battery box is securely mounted to the boat's structure, using appropriate fasteners and following the manufacturer's instructions.

Additionally, it is important to consider the wiring and connections associated with the battery box. The cables should be of sufficient gauge to handle the electrical load and be properly crimped and insulated to prevent short circuits. The positive and negative terminals should be clearly marked, and the battery box should have a cover to prevent accidental contact with the terminals.

Battery switches

When choosing a battery switch, it is important to consider the number of batteries and engines in your boat. For example, single-battery single-engine boats will typically use a Blue Sea 6006 or Bluewater ON-OFF Battery Switch. Two-battery single-engine boats will usually use either a Blue Sea 6007 or Bluewater 1-2-BOTH, or a Blue Sea 6011 or Bluewater ON-OFF-COMBINE Battery Switch.

It is also important to consider the amperage ratings of the battery switch, as these indicate the amount of continuous and intermittent use the switch can handle. Most battery switch ratings range from 100A to 450A continuous.

Additionally, look for a battery switch with an alternator field disconnect to protect your boat's alternator. This feature disconnects the alternator's field when the battery switch is turned off, preventing damage to the alternator's diodes.

Finally, when installing a battery switch, it is important to select a location that is easily accessible and as close to the batteries as possible, in accordance with American Boat and Yacht Council (ABYC) standards.

Battery wiring

There are various kinds of battery setups for boats, including single and dual battery options. A dual battery setup is ideal for a fishing boat as it allows for separate power sources that can give you the most efficient level of energy needed for starting the boat and operating tools. With this setup, one battery acts as the starter battery, which starts the engine, and a second battery is used to power all the tools you need onboard, like fish finders and GPS systems.

When wiring a dual battery setup, you will need the following tools:

• Lithium batteries: two batteries for the dual setup
• Cables: multiple cables to connect batteries and start bank terminals
• Cable cutters: to adjust the size of the cables being used
• Wrench: an adjustable wrench to secure the connections
• Grease: to protect electrical components
• Swagging tool: to adjust tubing fit for securing brazed connections

To wire a dual battery setup, you can choose between a series wiring option and a parallel wiring option. Series wiring is suitable for high-powered applications such as large boats with high voltage, while parallel wiring is used in most other situations.

For series wiring, you will need 2 to 4 similar batteries in terms of age, size, type, and manufacturer. The batteries are connected by joining the negative terminal of one battery to the positive terminal of another. A link or cable is then connected from the negative terminal of the first battery to the application, and another from the positive terminal of the last battery to the application.

For parallel wiring, you will also need 2 or more similar batteries. One wire is run from the positive terminal of one battery to the positive terminal of another, and another wire is run between the negative terminals. Finally, a lead is connected to the positive and negative terminals of one battery.

It is important to note that the conductor gauge must be compatible with the battery size to avoid safety hazards, and an overcurrent protection device like a circuit breaker must be used to protect the boat's energy system.

Additionally, when working with batteries, safety precautions should be taken, such as wearing safety glasses and having a water hose nearby to flush battery acid if it comes into contact with the skin or eyes.

Battery charging

Charging a boat battery is an essential skill for every boater. It is important to note that boat batteries are not the same as car batteries. Boat batteries are responsible for additional power needs, such as lights, gauges, pumps, and other electronics on board.

• Choose the Right Charger: Match your charger to your boat battery's chemistry and voltage. If you have multiple batteries on board, ensure the charger can accommodate all of them. There are two types of boat battery chargers: onboard and portable. Onboard chargers are more convenient as they are already connected to the battery system, while portable chargers are more affordable and can be used anywhere.
• Select the Right Time: The optimal charging temperature for ionic lithium batteries is above freezing, but they can be charged at temperatures as low as -4°F to -131°F without causing damage.
• Clean the Battery Terminals: Grimy battery terminals can disrupt the charging process, so clean them before charging.
• Connect the Battery Charger: Connect the red (positive) cable to the red terminal and the black (negative) cable to the black terminal. Plug in the charger and turn it on. If using a smart charger, you can set it and forget it.
• Disconnect the Charger: Once the battery is fully charged, disconnect the charger by unplugging it, then remove the cables in the reverse order: black, then red.

Additionally, here are some important considerations when charging a boat battery:

• Charging Time: A marine battery typically takes about four to six hours to charge from 0% to 80% when using a charger designed specifically for it.
• Charging on the Water: You can charge your boat's battery while it's afloat using portable chargers.
• Battery Life: How long a battery holds its charge depends on factors such as the type and make/model of the battery. Generally, a marine battery will hold its charge for about six months.
• Maintenance Costs: The cost of a marine battery charger ranges from $100 to $500, and batteries last three to four years, with replacement costs between $100 and $500.

For those looking to install a second battery, here are some key points:

• Battery Types: Starting batteries are similar to automotive batteries and supply a lot of current for a short time. Deep-cycle batteries can handle repeated deep discharging and recharging without damage. Dual-purpose batteries combine these abilities but have lower storage capacity.
• Safety: Batteries contain a lot of stored energy, so always remove positive battery cables from terminals when working on the electrical system to prevent short circuits and electrocution.
• Battery Location: Batteries are temperature-sensitive and need ventilation. They should be placed in an area that is comfortable for a person. Pre-manufactured, acid-proof battery boxes are recommended to securely anchor the batteries.
• Battery Connections: Use low-resistance, tinned copper wire and tin-plated copper connectors for the best electrical resistance and corrosion protection. Ensure all connections are clean and tight to prevent voltage drop and heat generation.
• Charging Lithium Batteries: Lithium batteries, which are gaining popularity, offer shorter charge times, lower weights, deeper discharges, and longer lifespans than lead-acid batteries. They do not suffer damage if not fully charged and have a greater depth of discharge, allowing longer times away from shore.

By following these instructions and considerations, you can effectively charge your boat battery and ensure you have reliable power for your boating adventures.

Battery maintenance

Well-maintained boat batteries can last for six to eight years. Here are some tips to ensure your batteries are in good condition:

• Avoid deep discharges. Discharging below 50% of total capacity significantly reduces battery life.
• Fully charge your batteries occasionally.
• Periodically charge your batteries over the winter, even if the boat isn't in use.
• Use a digital multimeter to check the charge of your battery.
• If you have a lead-acid battery, use a battery hydrometer to obtain an accurate reading of the battery's health.
• Ensure that your batteries are correctly mounted and secured in an acid-proof box or tray to contain spills and prevent physical harm.
• Keep your batteries properly charged. All batteries will self-discharge if left dormant.
• Use a marine smart battery charger to avoid overcharging or undercharging.
• If you have a flooded lead-acid battery, top up the electrolyte levels with distilled water.
• Keep the battery compartment well-ventilated. Gases escaping from the battery, particularly from overcharged lead-acid batteries, can be explosive.
• Keep the battery and terminals clean, dry, and corrosion-free.
• Isolate your batteries when you leave the boat by turning off the battery master switch.
• Clean the tops of the batteries as part of routine servicing.
• When hooking up a battery, ensure that you connect the terminals correctly.

Frequently asked questions