Steve and I have been working on a Hatteras motor yacht recently with lots of different flavors of DC. The house/start batteries are 32v, there are many 24v add ons, and all of the electronics are 12v. This weeks work has been replacing the fried 12 volt batteries and old ferro resonant charger with new Mastervolt AGMs. The boat now has 3 batteries in the 12volt house supply, 1 for the genset starter, with a new Mastervolt battery charger. THe big issue though is that unless you have shore power or run the genset underway to provide AC power, the 12volt battery banks are not kept charged. AS the owner found out several weeks ago all the electronics - Chartplotter, Radar, Sounders, Autopilot, etc died shortly after underway.
We've neared completion on a solution using a Newmar 32v - 12 volt converter, a diode isolator and a solid state relay to turn the converter on when the engines are running.
Hope to finish up early next week - wating for a special order heat sink for the solid state relay. Pictures to follow.
Now I have to go throw my clothes away - the 32v battery bank was a very wet configuration of Wet Cells!
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