Galvanic isolation

Just hauled out for hurricane season and noticed the zincs are pretty worn on the saildrive and hull.

Thanks

That being said, my 458 came with 4 AGM’s - 1 95ah up front for the bow thruster, 2 165ah for the house bank in the salon and one more 95ah under the companionway steps for an engine start battery. I have the one galvanic isolator behind the port cabin for incoming shore power. The engine start battery is hooked to the engine starter and alternator. The house batteries provide power to the generator starter through the high load DC bus under my nav table. The bow battery only is used to operate the bow thruster.

The banks are connected this way:

Start bank and house bank through battery combiner when either bank is receiving charge voltage.

House bank and bow battery through a DC/DC charger which is also a galvanic isolator. It switches on at 13v and will switch off at 12v in the 3 stage charging mode. It passes through 20 amps.

I haven’t had any unusual rust or corrosion anywhere. The system as set up works. It needs more batteries for a boat this size, but it works as installed.