Marine Electrical

Marine Electrical Supplies, Components & Power Systems

Power your boat safely and reliably with marine electrical supplies and components from West Marine. Whether you're replacing a battery, upgrading your charging system, installing new wiring, adding shore power, or rebuilding an electrical panel, find the marine-grade equipment you need for dependable onboard power. Shop marine batteries, battery chargers, inverters, marine wire, wiring components, electrical distribution equipment, shore power supplies, lighting, battery boxes, connectors, switches, circuit protection, and more.

Explore Marine Electrical Equipment

Marine Batteries

Marine batteries provide power for starting engines, running onboard electronics, operating accessories, and supporting house electrical systems. Choose from starting, deep-cycle, dual-purpose, AGM, lithium, and other marine battery options based on your boat's electrical demands and charging system.

Marine Battery Chargers

Maintain and recharge your batteries with a marine battery charger designed for onboard use. Marine chargers are available for single- and multi-bank battery systems and can help keep starting and house batteries properly charged while your boat is connected to shore power or another compatible power source.

Marine Inverters

Marine inverters convert DC battery power into AC power for compatible appliances and electronics aboard your boat. Depending on your system, an inverter can help power outlets, chargers, appliances, and other AC equipment when shore power or a generator is unavailable.

Marine Wire & Cable

Build and repair your boat's electrical system with marine-grade wire and cable. Marine wire is designed to withstand the vibration, moisture, salt, heat, and corrosion commonly found in boating environments. Shop primary wire, battery cable, duplex and triplex wire, specialty cable, and other marine electrical wiring for installation and repair projects.

Marine Wiring Components

Complete electrical installations with marine wiring components including terminals, connectors, heat-shrink products, cable ties, bus bars, terminal blocks, plugs, receptacles, and other electrical accessories. Using components designed for marine environments can help create more durable and reliable connections aboard your boat.

Marine Electrical Distribution

Manage and protect electrical circuits with marine electrical distribution equipment. Shop circuit breakers, fuse blocks, battery switches, switch panels, bus bars, electrical panels, and other components used to distribute power throughout your boat while helping protect connected circuits and equipment.

Marine Shore Power

Connect your boat to dockside AC power with marine shore power equipment. Find shore power cords, adapters, inlets, plugs, receptacles, connectors, and related equipment for supplying AC power to compatible onboard systems while your boat is at the dock.

Marine Lighting

Upgrade visibility, convenience, and ambiance aboard your boat with marine lighting. Shop navigation lights, deck lights, cabin lighting, underwater lights, spotlights, courtesy lights, and other marine-grade lighting designed for use in demanding boating environments.

Boat Battery & Charging Systems

Starting vs. Deep-Cycle Marine Batteries

Starting batteries are designed to provide a strong burst of power for engine starting, while deep-cycle batteries are designed to provide sustained power for onboard electrical loads. Dual-purpose batteries combine characteristics of both. Choose a battery type based on how it will be used within your boat's electrical system.

Lithium Marine Batteries

Lithium marine batteries can provide high energy density, reduced weight, and deep-cycle performance for compatible boat electrical systems. Before upgrading to lithium, confirm that your charger, alternator, battery management system, wiring, and other electrical components are compatible with the battery chemistry you select.

Onboard Battery Chargers

An onboard marine battery charger can manage one or more battery banks while the boat is connected to an appropriate power source. Choose a charger based on battery chemistry, bank count, battery capacity, charging requirements, and the electrical system installed on your vessel.

Marine Wiring, Circuit Protection & Electrical Panels

Marine-Grade Electrical Wiring

Boat wiring must withstand conditions that are much harsher than those found in many household electrical systems. Marine-grade electrical wire, terminals, heat-shrink connectors, and corrosion-resistant components are designed to help provide reliable electrical connections in wet and high-vibration environments.

Marine Circuit Breakers & Fuses

Marine circuit breakers and fuses help protect wiring and connected equipment from excessive current. Proper circuit protection is an essential part of a boat electrical system and should be selected based on wire size, circuit requirements, and the equipment being protected.

Marine Battery Switches

Marine battery switches help control connections between batteries and onboard electrical systems. Depending on the configuration, a battery switch can allow boaters to isolate battery banks, select between batteries, or disconnect power when the vessel is not in use.

Boat Electrical Panels

Organize and control onboard circuits with marine electrical panels and switch panels. Electrical panels can provide centralized switching and circuit protection for lighting, pumps, electronics, accessories, and other equipment aboard your boat.

Marine Shore Power & AC Electrical Systems

Shore Power Cords & Adapters

Connect compatible onboard AC systems to marina power with marine shore power cords and adapters. Select equipment based on the electrical service available at the dock and the shore power system installed aboard your boat.

Marine Inverters & Inverter Chargers

Inverters allow compatible AC equipment to operate from your boat's DC battery bank. Some systems combine inverter and battery-charging functions in a single unit, providing both AC power conversion and battery charging as part of an integrated marine electrical system.

How to Choose Marine Electrical Equipment

Determine Your Boat's Power Requirements

Start by identifying the electrical loads aboard your boat, including engine starting requirements, electronics, pumps, refrigeration, lighting, communications equipment, and other accessories. Understanding how much power your boat uses can help you select batteries, chargers, wiring, circuit protection, and other electrical components.

Use Marine-Grade Components

Choose electrical products designed for marine environments whenever required. Boats expose electrical systems to moisture, salt, vibration, heat, and corrosion, so components designed for marine use can provide greater durability and reliability than unsuitable alternatives.

Match Wire Size to the Circuit

Correct wire sizing depends on circuit amperage, wire length, voltage, and allowable voltage drop. Undersized wire can lead to excessive voltage drop and heat. Follow applicable marine electrical standards and equipment manufacturer recommendations when designing or modifying a boat electrical system.

Check Battery & Charger Compatibility

Battery chemistry and charging requirements vary. Before installing AGM, flooded lead-acid, lithium, or other batteries, confirm that your battery charger, alternator, inverter charger, and other charging equipment are compatible with the selected battery type.

Frequently Asked Questions About Marine Electrical Systems

What is the difference between marine wire and regular wire?

Marine wire is designed for the wet, corrosive, and high-vibration conditions found aboard boats. Depending on the product, marine-grade wire may use stranded, corrosion-resistant conductors and insulation designed for marine electrical installations.

What type of battery is best for a boat?

The best marine battery depends on its purpose. Starting batteries are designed for engine starting, deep-cycle batteries support sustained onboard loads, and dual-purpose batteries can perform both functions. AGM and lithium batteries offer additional options depending on your boat's electrical system and charging equipment.

What size marine battery charger do I need?

The appropriate marine battery charger depends on battery capacity, battery chemistry, number of battery banks, and desired charging time. Select a charger that is compatible with your batteries and electrical system and follow manufacturer recommendations for charger sizing.

What does a marine inverter do?

A marine inverter converts DC power from a battery bank into AC power that can operate compatible household-style electrical devices and outlets aboard a boat. The inverter size should be selected based on the equipment you plan to power and the capacity of your battery system.

What is shore power on a boat?

Shore power allows a boat to connect to an external AC electrical source while docked. It can provide power for onboard AC equipment and battery chargers through compatible shore power cords, inlets, distribution equipment, and circuit protection.

Why do boats need circuit breakers and fuses?

Fuses and circuit breakers help protect electrical wiring and equipment from excessive current. Properly selected circuit protection is an important part of a safe and reliable boat electrical system.

Can I replace my boat batteries with lithium batteries?

Some boat electrical systems can be upgraded to lithium batteries, but the entire charging and electrical system should be evaluated for compatibility. Chargers, alternators, battery management systems, wiring, circuit protection, and other components may need to meet specific requirements for lithium batteries.

What electrical supplies should I keep on my boat?

Useful electrical supplies can include spare fuses, replacement circuit breakers where appropriate, terminals, connectors, heat-shrink tubing, electrical tape, spare bulbs or lights, basic electrical tools, and other components suited to your boat's electrical system.

Shop Marine Electrical Supplies at West Marine

Shop marine electrical supplies, components, and parts at West Marine for powerboats, fishing boats, sailboats, cruisers, and other vessels. Find marine batteries, battery chargers, inverters, marine wire, electrical distribution equipment, circuit protection, shore power supplies, wiring components, lighting, battery boxes, and more. Whether you're making a simple electrical repair or upgrading your boat's entire power system, find the marine electrical equipment you need at West Marine.