Join Date: Jul 2001
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From the reading I've completed the recommendation is that with the battery combiner you don't need a battery switch. You install a separate parallel switch between the two positives from each battery (which each have switches)which allows the batteries to be combined or substituted in an emergency. House and starter circuits are independent. Alternator charges the house battery. My guess is that your amp draws would be much higher than mine so I guess yours wold be overkill for my simple lower amp requirements.
You may not be understanding the concept of the 1-2-B switch. Simplicity in itself.
Amp draws have nothing to do with switching concepts, only wire and fuse sizing.
Your "idea" is not new, and was proposed 15 years ago by West Marine. Back then I thought it was nuts and still do. Why replace one simple 1-2-B switch with three switches? Few people have used that idea because of its complexity.
We've kinda given you all the modern thinking on this issue based on your original question. What you choose to do with it is up to you. Your boat, your choice, but I can't think of anything easier to wire, understand and use than Option 1 in my links to you.
The one that Brian showed is Option 2.
You might want to think about it some more.
Stu Jackson, Catalina 34, 1986, M25 engine, Rocna 10 (22#), Maple Bay, BC, Canada
Last edited by Stu Jackson; 01-03-2012 at 12:46 AM.