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Connecting a DC main negative bus to a sacrificial anode is not a requirement for a standard grounded DC system.1:27 Nigel Calder explains that the DC system’s ground, typically established through the engine or a ground plate, functions independently of the galvanic protection system.1:08 Sacrificial anodes exist solely to prevent galvanic corrosion on underwater metals like propeller shafts, propellers, and through-hull fittings.1:40 While zinc remains the traditional choice for salt water and magnesium for fresh water, specialized aluminum alloys now offer a versatile alternative suitable for both environments.2:57 Aluminum anodes last longer and produce fewer harmful byproducts as they dissolve.3:20 Never mix different anode materials within the same system, as they will cause accelerated corrosion of one another.3:30 Replace anodes once they are 50% consumed, as their protective effectiveness decreases proportionally with their remaining surface area.4:13 Anodes within an engine's internal cooling system are considered separate from the hull's external bonding system and may use different materials.3:30

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