I am designing an electrical system
for a 65' catamaran
that will use 2 Yanmar
6BY260 engines. Yanmar
is supplying these only with 12 volt systems, and a lot of the innards of these new Tier 2 engines use electricity--the injectors are "magnetic," which I assume means electric
injection, a computer controls everything, and who knows what else besides sensors is electrical
. I think the reason Yanmar won't supply a 24 volt version is that it is a marinized car engine
I want to run a 24 volt boat, with two 24 volt alternators bolted to the engines in addition to the stock 12 volt alternators, so I want to completely separate the house bank from the starting bank. All I want to connect to the system running on 12 volts are the engines, starting batteries, and their harnesses.
All of the sample circuit drawings show one connected system, so I don't have much to go on. Do I need to connect the grounds of the two systems for safety
? Does it matter that they are working at different voltages?
I don't have any use for a 220 volt AC system, as this boat will live on a mooring
buoy, and I don't intend to operate any equipment
that uses AC power. I'll operate the bridge's electronic stuff that doesn't come in 24 volts from a little 24v DC to 12v DC converter.
(Answers to FAQ-It's a big boat, and needs 24v power for big loads with long runs; yes, you can get 24v in almost any piece of equipment
; no, it's not very complicated if you start out as a 24v boat as opposed to adding 24v to a 12v boat.)