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Go Back   SailNet Community > On Board > Gear & Maintenance > Electrical Systems
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  #21  
Old 11-03-2010
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The single output is a better choice, regardless of the opinion of the Guest tech. With an ACR the dual defeats the purpose.

Fuse sizing is not critical. You are fusing for short circuit, not overload. Here's the link that explains it well. See short circuit protection just below the chart.
Choosing Circuit Protection - Resources - Blue Sea Systems

Here's an explanation of fusing batteries Blue Seas re ABYC E-11

In the diagram you posted notice the fuses after the switch. The source of any problem will be the batteries. If they are fused close (within 7") the possible problem is solved at the source.
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Last edited by mitiempo; 11-03-2010 at 08:00 PM. Reason: add
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Old 11-07-2010
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Brian, would you agree that with the switch on "C" the fuses will blow when I start the engine? The idea, then, is to always use either 1 or 2, but not "Both". "Both" is used only during charging so both banks charge. 2 is just a reserve battery, to be used when 1 is out. Right?
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Old 11-07-2010
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They shouldn't blow under any normal circumstances with the correct fuse chosen. Size isn't real critical as you are fusing for a short circuit rather than overload. Fuse size can be up to 150% of the wire rating. I have fused start batteries without any problems.
Blue Seas ANL fuses are a good choice. The 150 amp ANL fuse will blow at 250 amps current at the 500 second mark. Your engine cranking should only last 15 or 20 seconds at the most.
Here's the link to circuit protection at Blue Seas. Short circuit fusing is described just below the chart.
Choosing Circuit Protection - Resources - Blue Sea Systems
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Old 11-07-2010
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Quote:
Originally Posted by SouthBrooklyn View Post
Brian, would you agree that with the switch on "C" the fuses will blow when I start the engine? The idea, then, is to always use either 1 or 2, but not "Both". "Both" is used only during charging so both banks charge. 2 is just a reserve battery, to be used when 1 is out. Right?
Nope. Please think of how it works and which way the electrons flow.

The outboard is connected directly to the house bank. To start, the switch could be off. The battery powers the outboard to start and once started, that's it unless you have an alternator on the outboard in which case the electrons flow the other way and charges the house bank. The ACr parallels the banks.

The ONLY thing coming off the switch is the distribution panel, and the switch TAKES power from whichever battery bank you choose.

No need to use Both since the ACR does that automatically.

I'm going to go back to the last diagram and check it again.
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Quote:
Originally Posted by SouthBrooklyn View Post
Brian, would you agree that with the switch on "C" the fuses will blow when I start the engine? The idea, then, is to always use either 1 or 2, but not "Both". "Both" is used only during charging so both banks charge. 2 is just a reserve battery, to be used when 1 is out. Right?
Nope. Please think of how it works and which way the electrons flow.

The outboard is connected directly to the #1 bank. To start, the switch could be off. The battery powers the outboard to start and once started, that's it unless you have an alternator on the outboard in which case the electrons flow the other way and charges the #1 bank. The ACR parallels the banks.

The ONLY thing coming off the switch is the distribution panel, and the switch TAKES power from whichever battery bank you choose.

No need to use Both since the ACR does that automatically.

I'm going to go back to the last diagram and check it again.
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Old 11-10-2010
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I am interested in this topic and especially how to add a solar panel... however that's another thread. Now, to SouthBrooklyn, this word from a newbie: Long Island is, well, long. Along the south shore are few harbors / inlets. But if the sky is clear, the shooting stars can be wonderful. We navigated twice at night, once in accordance with plan, and once to take advantage of lesser headwinds.
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