Protecting your boat's electronics from lightning: new technology worth knowing about

Lightning is one of the more sobering hazards for anyone spending time on the water. A direct strike packs an average of 300 million volts and 30,000 amps, enough to destroy every piece of electronics on board and leave the owner facing a very expensive rebuild. But even a near miss carries serious risk, as a bolt landing close to a vessel can discharge a massive current into an iron keel, which then travels through the boat’s structure and fries the wiring.

Italian company Euthalia, which has been manufacturing anti-lightning devices for over 70 years and protects many of Italy’s most famous buildings, has developed a layered system specifically designed to address this near-miss problem at sea.

The system works in stages. A passive cone fitted at the masthead disrupts the upward electrical charge that tends to attract lightning in the first place, encouraging strikes to go elsewhere. A series of large fuses connected to the keel absorb current trying to travel through the hull, protecting thrusters, stabilisers and their control electronics. The final layer is a set of small 12V powered sensors connected directly to individual pieces of equipment, such as chart plotters, radar units and network hubs. These act as intelligent fuses, sensing a surge and cutting power to the device before damage can occur.

It is a timely development given how much modern boats depend on integrated electronics, particularly during the kind of bad weather that tends to produce lightning in the first place.

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A notable endorsement of the system comes from the Ferrari Hypersail project, a carbon fibre yacht due to launch this year that will run entirely on renewable energy. The project has selected Euthalia as its lightning protection partner, a strong signal of confidence in the technology.

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For more information, see the original IBI News report at the link below, and visit Euthalia’s own boat lightning protection page for technical detail on the full system.