The essentials in 30 seconds
- Three families coexist in 2026: classic mechanical circuit breakers (BEP, Blue Sea, the standard for recreational boating), CZone (Navico, B&G/Simrad/Mastervolt integration), EmpirBus (Mastervolt, full MasterBus integration).
- Advantages of digital switching: consumption monitoring per circuit (fridge, autopilot, etc.), smartphone control, scenario automation (Night = everything off except navigation), data history.
- Disadvantages: hardware cost 3–5× higher, configuration complexity, electronic dependency (CPU failure = total failure), training required for after-sales service.
- Workshop verdict: classic BEP for 70% of 30–45 ft recreational sailboats. CZone for 45+ ft newbuild yachts already equipped. EmpirBus for 50+ ft yachts with a complete Mastervolt ecosystem.
The electrical switchboard is the energy nerve center of the sailboat. It distributes power to circuits, protects against short circuits, and allows switching loads on and off. The digital generation (CZone, EmpirBus) adds monitoring and automation but costs 3–5× more. This article distinguishes the use cases.
The three families of switchboards
Classic — mechanical circuit breakers
Recreational boating standard since the 1970s. Thermal-magnetic circuit breakers (Blue Sea, BEP) mounted on a panel with ammeter/voltmeter. Robust, simple, economical.
CZone — Navico digital
Navico digital switching system, integrated with B&G/Simrad/Mastervolt ecosystems. Distributed I/O modules + central interface via chartplotter or dedicated display.
EmpirBus — Mastervolt digital
Complete Mastervolt digital system, integrating switchboard + battery monitoring + equipment control. Proprietary MasterBus architecture.
Classique BEP — standard pleasure boating
Skysat distributes the BEP range (Blue Sea sub-brand) with 6-12-24 circuit breaker panels:
- 12V DC 8-circuit vertical breaker panel.
- 12V DC 12-circuit horizontal breaker panel.
- CSP6 PTC 6-way waterproof breaker panel for cockpit use.
- Color DC monitor with shunt for consumption monitoring.
CZone — Navico/Mastervolt ecosystem
Distributed architecture: I/O modules near loads + central interface on Zeus/Vulcan chartplotter or dedicated COI display.
- COI Combination Out Interface for 8 controllable outputs module.
- 6/12/24-way I/O modules.
- Central interface via Zeus 3S or dedicated display.
- iOS/Android smartphone app for remote control.
EmpirBus — complete MasterBus integration
Mastervolt system for high-end yachts with full Mastervolt ecosystem (Alpha Pro alternator, MultiPlus, MLi Ultra).
- NXT Touch modules (integrated display), NXT Lighting (lighting), NXT Switching (outputs).
- Native MasterBus integration: lithium bank monitoring + switchboard in a single interface.
Technical comparison table
| Criteria | Classic BEP | CZone | EmpirBus |
|---|---|---|---|
| Power consumption/post consumption monitoring | No (global shunt) | Yes | Yes (MasterBus integrated) |
| Smartphone control | No | Yes (B&G/Simrad app) | Yes (Mastervolt app) |
| Scenario automation | No | Yes | Yes |
| CPU failure = total failure | No (mechanical) | Yes (manual backup possible) | Yes |
| Target program | Pleasure sailboat 30-45 feet | Yacht 40-55 feet | Yacht 50+ feet Mastervolt |
Workshop verdict by program
Pleasure sailboat 30-45 feet — Classic BEP
Skysat workshop standard. Panel with 12 circuit breakers + separate battery monitoring shunt (BMV-712). Robust, easy to maintain.
New 40-55 feet yacht already equipped with CZone — keep
If the yacht is delivered with CZone by the builder (Bénéteau, Jeanneau, Hanse), keep it and enhance it during refit. Switching to Classic means loss of integration and heavy work.
50+ feet yacht with Mastervolt ecosystem — EmpirBus
If doing a full refit with MLi Ultra + MultiPlus + Alpha Pro, EmpirBus provides perfect integration. Relevant only with a majority Mastervolt ecosystem.
Installation and configuration
Workshop rules — panel installation
- Accessible position: standing, at hand height, near the saloon.
- Ventilation: 5-15 W dissipated depending on active loads. Not in a closed locker.
- Consistent wiring: strict color code (red = positive, black = negative, yellow = ground), labeling on each circuit.
- Final documentation: annotated electrical diagram, user manual, emergency procedure (cut main battery).
FAQ — Electrical panel
Can a classic panel be converted to CZone?
Yes, but it’s heavy work. Remove classic panel + install distributed I/O modules + central integration + software configuration. Allow 4-6 days for a 40-foot sailboat. Often not relevant compared to a full winter refit.
What to do if a CZone module fails?
CZone offers a "manual backup" mode (physical bypass switch) on certain modules. Otherwise, module replacement takes 1–2 days. Plan for continuity if heavily dependent.
Real energy savings with digital switching?
Yes, on an annual basis. Per-circuit monitoring reveals hidden consumption (e.g., fridge cycling too often, screens left on overnight). Typical savings: 15–25% of total consumption.
Is a smartphone genuinely useful day-to-day?
Yes for three cases: (1) remote shutdown after leaving the boat, (2) dockside monitoring to check battery state in winter, (3) simple automation (e.g., turning on the fridge two hours before boarding).
6, 8, 12 or 24-circuit breakers?
30-foot sailboat: 8 circuits. 35–40 feet: 12 circuits. 45+ feet: 16–24 circuits. Always allow 20% spare capacity for future upgrades (new equipment).
Skysat distributes BEP, CZone and EmpirBus.
