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BoatHowTo · video

Simplifying COMPLEX CHARGING SYSTEMS on Boats 🔧 | Ask The Expert with NIGEL CALDER

27 May 2026 · 3 min · 3K views

Nigel Calder explains boat charging system with diagram

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What this video covers

Jan Attenstedt and Nigel Calder evaluate a boat charging system that uses an alternator connected to a three-output battery isolator.▶ 0:25 This configuration feeds a DC-DC charger for a lithium-ion-phosphate house bank and direct lines to AGM engine, generator, and bow thruster batteries.▶ 0:35 The system lacks a Balmar APM, but the presence of connected AGM batteries prevents an open circuit and subsequent voltage spike if the lithium-ion battery management system disconnects.▶ 0:55 However, the setup suffers from voltage losses across the isolation diodes and requires heavy-gauge wiring to the bow thruster to handle the alternator's full output.▶ 0:01 Replacing the isolator with dedicated DC-DC converters for each bank would allow for current limiting, enable the use of smaller conductors, and provide more precise charging algorithms.▶ 2:37 The current configuration is considered outdated and overly complex compared to modern alternatives.▶ 0:00

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ONE SWITCH for TWO PUMPS?? (Pontoon Boat Setup) | Ask The Expert with NIGEL CALDERJul 2026OIL LEAKS at the Crankshaft... | Ask The Expert with NIGEL CALDERJul 20261-2-both switch - Cost effective charging system on small boats? 🤔 Ask The Expert with NIGEL CALDERJun 202648V or 24V - What makes more sense on a Boat? | Ask The Expert with NIGEL CALDERJun 2026

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Not navigation advice · © 2026