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  #11  
Old 12-24-2011
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Originally Posted by mitiempo View Post
Bill

With a 1/2/both switch each bank can be a house bank so I believe both should be fused.
Brian,

Definitely. But the start circuit fuse needs to be larger than a house fuse in order to avoid nuisance blows when starting the engine. On a small diesel, I believe 300-400A is appropriate.

And, if you're going to regularly start the engine using the BOTH position (i.e., from the house battery bank), then you'll also need a large 300-400A fuse in that circuit.

Cheers,

Bill
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Old 12-24-2011
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I would try not to fuse above the wire's ampacity, although up to 150% of that is ok. ANL fuses are unique in blow point though. 2/0 as an example is good for about 280 in engine spaces. A 275 amp ANL has a blow point of 420 amps after 500 seconds and much more for shorter periods of time. That should not have nuisance blows. I haven't had any issues with nuisance blows fusing starting circuits.

I would never start from the BOTH position. If one battery can't start the engine switch to the other - especially with AGM batteries.
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Brian,

Yes, I know about the ANL fusing delays and ratings. Still, I'd go with a larger one, since I have personally blown a 150A or 250A ANL on my 4-108....can't remember which. No problems since I've started using a 400A ANL over 5 years ago, and my wiring is 2/0.

Look at Maine's circuit diagram. If you're going to use the house batteries for starting, you HAVE to use the BOTH postion (and leave the ON-OFF switch OFF, isolating the start battery).

Bill
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If you use the extra switch Maine suggested you are correct - I just use the 1/2/both switch and skip the extra switch.

400 amps is less than 150% of 2/0 wire's ampacity if it works for you.
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Old 12-25-2011
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Thanks Bill, Brian, Maine, everyone, and Merry Christmas. It sounds like the Echocharge is a better fit for what I want to do. I'll also pick up another battery switch to use for the starting circuit as drawn by Maine.

The 2 existing batteries will be wired in parallel to make the house bank and I'll get a new starting battery. I'm going to try and sneak out there later today and take some pictures and measure things. As I get closer to a final layout I'll try to post a drawing.

Thanks again

Fitz
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Sounds like a good plan. Merry Christmas.
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Here's a reference that supports what Bill, Brian and Maine Sail have been saying (I just put it all in one place ):

Basic Battery Wiring Diagrams
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Thanks Stu. That's a great link. I'm going with option 2 and the Echocharge.

I did get some pictures today and have some research to do now on the existing alternator (Motorola?) and regulator (spa creek?) to try and figure out what kind of output it has.

My shore charger is a Xantrex "Truecharge 10 amp TB". It looks almost new and has 8AWG wires going to the house bank location.

I'll use 2/0 for all the high current/starting runs and ANL fuses as suggested.

Thanks for all the help everyone. It's going to be a lot of expensive wire, (and lugs, and fuses, and busses, and switches...) but like most of these projects, in the end, I'll have learned some things I didn't know I didn't know!
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The best place to buy wire, cables, and lugs is Genuinedealz > Marine Wire, Boat Wire, Boat Cable, Marine Grade

If you don't have the proper crimp tool they will install lugs on the 2/0 for $1 labor each. The only disadvantage is that you have to measure the proper lengths when ordering.
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Old 12-25-2011
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Quote:
Originally Posted by Fitz87 View Post
Thanks Stu. That's a great link. I'm going with option 2 and the Echocharge.

I did get some pictures today and have some research to do now on the existing alternator (Motorola?)

Thanks for all the help everyone. It's going to be a lot of expensive wire, (and lugs, and fuses, and busses, and switches...) but like most of these projects, in the end, I'll have learned some things I didn't know I didn't know!
curious as to your current cost estimate.
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