Electrical system

The marine electrical system includes cables, protection devices, lighting, battery management, and 12 V and 24 V power distribution. When choosing, it is best to start with the type of circuit to be protected or powered — navigation, anchor windlass, lighting, charging — and the cable gauge or the rated current of the fuses. Leggi la guida

Batteries, chargers, inverters

Lights and headlights

Cables, outlets, switches

Le marche di Electrical system

Osculati Trem Fni Electra A.a.a.T-power Hella marine Blue Sea Egis Victron Energy Quick Marco Marinco Cbe Easy Led Plastimo

How to choose the components for the onboard electrical system

Marine electrical cables: cross-section and insulation

Cables intended for marine use must withstand moisture, vibration, and salt spray: super-insulated PVC insulation and tinned copper conductivity are basic requirements. The cross-section must be sized based on the maximum current of the circuit and the length of the run, to contain the voltage drop. For power circuits such as the anchor windlass, generous cross-sections are required; for instrumentation or courtesy lights, smaller cross-sections are sufficient.

Fuses and protection: ANL, ATO/ATC, AMI/MIDI and glass

The choice of fuse depends on the rated current of the circuit and the type of fuse holder already on board. ANL fuses are used on high-current circuits such as the main battery cables; ATO/ATC and AMI/MIDI cover auxiliary circuits and multiple distribution panels. Glass fuses remain common in older installations. Blue Sea and Quick offer fuse holders and fuses designed specifically for the marine environment.

Switches and battery disconnects

Magneto-hydraulic circuit breakers protect without degrading with the temperature variations typical of the marine environment. The two-pole battery disconnect completely isolates the system when the boat is not in use, preventing accidental discharges and short-circuit risks. Blue Sea, Osculati and Egis offer solutions for different rated currents and battery configurations.

Navigation lights, lanterns and LED lighting

Navigation lights must comply with navigation regulations based on the length of the vessel and the type of use. LED lanterns reduce consumption compared to incandescent versions and extend the life of the optics. For interior lighting, stainless steel ceiling lights with polycarbonate lenses are suitable for the humid environment; Hella Marine courtesy lights are among the most sought-after products for passageways. Underwater LED lights for stern mirrors and hulls require watertight connections and materials resistant to galvanic corrosion.

Batteries, battery chargers and inverters

Onboard power management involves choosing the type of battery (AGM, gel, lithium), the Ah capacity appropriate for actual consumption, and a battery charger compatible with the battery chemistry. Victron Energy and Mastervolt are established references for multi-stage battery chargers and inverters. A battery test panel allows monitoring of the state of charge; the battery box mechanically protects the battery from moving while sailing.

Domande frequenti

Che differenza c'è tra un fusibile ANL e un fusibile AMI/MIDI?

I fusibili ANL sono progettati per correnti molto elevate e si usano tipicamente come protezione principale sul cavo batteria. I fusibili AMI e MIDI coprono correnti intermedie e si trovano spesso su circuiti ausiliari o pannelli di distribuzione secondari. La scelta dipende dalla corrente massima del circuito da proteggere.

Come si sceglie la sezione del cavo elettrico per un'installazione marina?

La sezione si calcola in base alla corrente massima assorbita dall'utenza e alla lunghezza totale del percorso andata-ritorno, per mantenere la caduta di tensione entro valori accettabili. In ambiente marino è preferibile sovradimensionare leggermente la sezione per compensare le condizioni di temperatura e umidità.

Cosa significa staccabatteria bipolare e quando è necessario?

Un interruttore staccabatteria bipolare interrompe sia il polo positivo che il polo negativo, isolando completamente la batteria dall'impianto. È consigliato quando la barca rimane ferma per periodi prolungati, per evitare scariche dovute a carichi passivi e come misura di sicurezza antincendio.

Le luci di via LED sono adatte alla navigazione notturna?

Sì, a condizione che siano indicate per la lunghezza dell'imbarcazione e il tipo di navigazione previsto. I produttori come Hella Marine e Osculati riportano nelle specifiche il settore angolare e la portata visiva, parametri da verificare in base alle normative applicabili alla propria imbarcazione.

Nella stessa sezione

Blanket and leg warmers Onboard comfort Plumbing and Toilets Mooring and anchoring Engine Electronics Maintenance and hardware Inflatables, trolleys and sports Onboard safety