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Epic Navigator · video

This video will save your batteries. Energy management on board a boat

22 February 2026 · 3 min · 3K views

Lagoon 42 exterior with 220V shore power at marina

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What this video covers

Energy management on a Lagoon 42 catamaran is the focus, covering how the boat's three 220V power sources — shore power, generator, and inverter — interact with the battery bank and where failures occur.▶ 0:05 The battery bank has a maximum continuous draw of around 2,000W; exceeding that limit damages both the batteries and connected equipment.▶ 1:02 A key failure mode is leaving a high-draw appliance — such as a hair dryer — running on inverter power overnight, which can destroy the battery bank.▶ 1:38 Before switching on any 220V source, the inverter must be turned off first to prevent an automatic switchover that hits the batteries under heavy load.▶ 1:38 A coffee grinder can run briefly on the inverter; sustained high-draw appliances cannot.▶ 1:38 The 220V circuit on a Lagoon 42 is wired directly to shore power or the generator only — not through the batteries — which protects the bank from heavy loads.▶ 2:49 When connected to shore power, only one or two circuits should be active, not all simultaneously.▶ 2:49 Always confirm the inverter is off before adding any high-draw device to the circuit.▶ 2:49

Boats in this video

Lagoon 42Reviewed

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