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Sizing main battery cables and fuses depends on the total electrical load of the vessel rather than the battery bank's amp-hour capacity or cold cranking amps.2:56 Nigel Calder explains that the feeder conductor must handle the maximum simultaneous load, which is determined by calculating the sum of all active appliances.1:11 Once the total amperage is identified, the conductor's ampacity must meet or exceed that number, and the fuse rating at the battery end must be sized accordingly.1:45 If high-draw equipment like a bow thruster creates a peak load that exceeds the fuse rating, the system requires reconfiguration, such as installing a dedicated battery for the thruster or upgrading both the fuse and the feeder cable to match the higher demand.1:57 ABYC standards provide the framework for these calculations.1:29 While battery capacity is critical for energy balance and runtime, it does not dictate the sizing of the primary feeder cables or protection devices.2:42

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