I see my original post caused some confusion. I think of going 120 AC for the entire house bank, except for the instruments that require 12 DC. I think I can acquire 120 marine grade, although I wire a bunch of my outbuildings with wire that is submerged for most of the time. I would used a smaller Beta generator (5KW) to keep the large battery bank for both propulsion and house bank, along with solar. I am thinking around 50 KW ah. The generator would be able to power the house bank and or the aux motor directly. Of course an inverter would take the battery bank to 110. Whatever voltage the motor requires, it would be able to take it directly from the batteries.
Generator---->AC/DC converter --------->propulsion
shore power battery-^----> inverter-----housepower
either power-------------------------------------------^--------------------------------^
Its really quite a simple system, and the only thing I can see wrong with it is that the inverter would have to be on as long as you are using any of the house powered systems.
Newt
Not sure what you are exactly thinking of, but if you are saying why not use a 120V AC motor for propulsion?The reason would be efficiency. If you are converting from DC (Batteries) through an Inverter(90% Efficiency) to an AC Motor(75-90% Efficiency), that is not as efficient as Batteries directly to a Brushless DC Motor(92% Efficiency).Also, on boats, you should not use residential wiring or connectors... you have to use marine grade everything.Typically on a sailboat, you would have a big propulsion battery bank, and have a DC to DC converter, to go from your say 74 Volt propulsion battery bank to 12 volt house power. And most likely have a small 12 volt battery bank that is charged by the DC to DC converter and Solar. Then you would have an inverter for any 110 volt house loads, like a microwave, tv, computer...Hi all,I monitor this group a lot but rarely contribute. That's going to change. While powering over a current over a bar here in Oregon, my v drive ended with a loud bang followed by a grinding noise and no power to the prop. Well I will use this opportunity to go electric. In talking to the thunderstruck guys, they suggest 18 or even 24 kw (40 ft Valiant) . I thought why not just use their reduction drive and go with 120 for the house and the aux?Advantages...More power to auxStandardized wiring (cheaper)Home appliances (cheap)Solar to 120, gen to 120 easy to do.DisMarine stuff is mostly 12 volt. So will need step down for instruments, radar etcWhat do you think...anybody done this? Why not?
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