How the ground plate in the hull works – and why it is crucial for your boat

Optimize the onboard electrical system with the right grounding plate and proper earthing for safety and performance.

For anyone using advanced electronics onboard – from navigation systems to powerful inverter solutions – a good grounding system is essential. A grounding plate, or "earthing plate," creates an effective connection between the boat’s electrical system and the sea, providing stability, safety, and optimal performance.

What does a grounding plate do?

A grounding plate acts as a bridge between the boat’s electrical system and the water. It dissipates electrical interference and static electricity, which is especially important for:

• Radio and antenna systems: To achieve optimal signal and reduce noise.
• Navigation equipment: To avoid incorrect readings.
• Protection against galvanic corrosion: By creating a stable reference point for electrical circuits.
• Power units such as inverters and combination units: To ensure proper protective earth (PE), stable operation, and correct functioning of residual current devices (RCDs).

How does it work?

Modern grounding plates, such as those from Glomex, are made of sintered bronze – a material consisting of millions of microspheres. This provides an effective surface up to ten times larger than the actual plate size. The large surface improves heat dissipation and ensures a stable electrical contact with the water.

The plates are mounted on the hull with corrosion-resistant bronze bolts and rubber spacers, guaranteeing long life and high resistance to marine environments.

Earthing Victron Energy devices (Inverter, MultiPlus, Quattro)

Victron Energy products such as Inverter, MultiPlus, and Quattro are the heart of many modern onboard electrical systems. For these to operate safely and efficiently, proper earthing is required:

• Protective earth (PE): All Victron devices have a PE connection that should be linked to the boat’s grounding system. This reduces the risk of electric shock and protects against fault currents.
• Neutral-to-earth connection: When using inverter mode, an internal connection between neutral and earth is often created to meet safety requirements. This ensures RCDs function correctly.
• Grounding plate as a reference point: By connecting PE from Victron devices to the grounding plate on the hull, you get a stable reference to the sea, which is important to avoid interference and galvanic issues.
• Extra protection when using shore power: When connecting shore power, ensure the earthing is properly integrated with the boat’s system to avoid ground loops.

Installing a grounding plate and ensuring Victron devices are properly earthed is not just a technical detail – it’s an investment in the boat’s functionality and safety. Tip: Use heavy-duty cables and corrosion-resistant connections for the grounding wire. Regularly check that the grounding plate is clean and free from deposits for best performance.

Why should you invest in a grounding plate and proper earthing?

• Better performance for electronics: Stable signal and less interference.
• Increased safety: Protection against electrical faults and corrosion.
• Optimal function for Victron systems: Safe operation and correct RCD functionality.
• Long-term durability: Materials and design that withstand harsh conditions.

Explore our range of grounding plates for a safe and stable onboard electrical system

At Digital Skipper, you’ll find high-quality grounding plates that provide an optimal grounding system for your boat. Our products reduce electrical interference, protect against galvanic corrosion, and ensure proper earthing of electrical systems and power units. Click here to see the full range!