Groundplates and accessories

Grounding plates are a critical component of any boat's electrical system. Their primary function is to create a zero-potential reference point for connecting all metallic masses on the vessel (engine, hull, masts, etc.). This allows galvanic currents to safely discharge into the sea, preventing electrolytic corrosion of submerged metals. Proper grounding is also essential for protecting onboard electronic equipment from surges and lightning strikes.

For an efficient system, you'll also need tinned copper grounding straps of the appropriate gauge to connect the various components. Tinned copper offers superior corrosion resistance compared to bare copper, ensuring a reliable connection over time.

Noise filters also play an important role, particularly for radio and navigation equipment. These filters eliminate electrical noise that can interfere with signal reception.

Nautica Basile's Expert Advice

• Regularly inspect the grounding plate and connections for signs of corrosion. Corrosion can compromise the effectiveness of the grounding system.


• Always use tinned copper of the appropriate gauge for all connections. An undersized cable can overheat and cause problems.


• Install a high-quality noise filter to protect sensitive electronic equipment.


• If you have any doubts about your electrical system, consult a qualified professional. A non-compliant system can be dangerous.

You might also be interested in our section of marine-grade electrical cables and waterproof connectors to complete your installation.

Frequently Asked Questions

What size grounding plate should I choose for my boat?

The size of the grounding plate depends on the size of the boat and the power of the electrical system. In general, a plate of at least 100 cm² is recommended for boats up to 10 meters, and at least 200 cm² for larger boats. Always consult the manufacturer's specifications for the correct choice.

How do I install a grounding plate?

The grounding plate should be installed in a location on the hull that is always submerged, preferably near the waterline. It should be connected to all metallic masses on the vessel using tinned copper grounding straps of the appropriate gauge. Ensure that the connections are tight and protected from corrosion.

Can I use an aluminum grounding plate instead of copper?

No, it is not recommended to use aluminum grounding plates. Aluminum is less conductive than copper and more prone to corrosion in the marine environment. Tinned copper is the best material for grounding plates.

What are galvanic currents and how does the grounding plate prevent them?

Galvanic currents are electrical currents that are generated between dissimilar metals immersed in saltwater. These currents can cause electrolytic corrosion of the less noble metals. The grounding plate, connected to all metallic masses on the vessel, creates a zero-potential reference point, minimizing the potential differences between the metals and preventing corrosion.

What size grounding plate should I choose for my boat?

The size of the plate depends on the size of the boat and the power of the electrical system. In general, a plate of at least 100 cm² is recommended for boats up to 10 meters, and at least 200 cm² for larger boats. Always consult the manufacturer's specifications for the correct choice.

How do I install a grounding plate?

The plate should be installed in a location on the hull that is always submerged, preferably near the waterline. It should be connected to all metallic masses on the vessel using tinned copper grounding straps of the appropriate gauge. Ensure that the connections are tight and protected from corrosion.

Can I use an aluminum grounding plate instead of copper?

No, it is not recommended to use aluminum plates. Aluminum is less conductive than copper and more prone to corrosion in the marine environment. Tinned copper is the best material.

What are galvanic currents and how does the grounding plate prevent them?

Galvanic currents are electrical currents that are generated between dissimilar metals immersed in saltwater. These currents can cause electrolytic corrosion of the less noble metals. The grounding plate, connected to all metallic masses on the vessel, creates a zero-potential reference point, minimizing the potential differences between the metals and preventing corrosion.