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Old 30-06-2005, 11:19   #1
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Some interesting tutorials at:
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~ Cruising Considerations:
~ What are Amp Hours:
~ Calculate 12 volt Requirements:
~ Wind Generator Comparison:
~ High Output Alternators:
~ For the easiest way to charge your starter battery read the Simpler Solution:

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Old 01-07-2005, 10:32   #2
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i like the simplicity of just a diode for charging the starter battery from the house battery but i don't like the idea of if the alternator fails and your out to sea it seems that both banks of batteries will be drained. i would want something that would totally isolate each bank unless the alternator was putting out.

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Old 01-07-2005, 11:48   #3
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Dave, I am not sure why a failed alternator would cause both banks to drain if your alternator died. You have to throw the bypass switch if you want to use your house bank to start the engine. Remember if you're out cruising you will most likely have wind, solar and/or a diesel generator to supply juice to your house bank.

Please let me know your thoughts as I am curious if there is something I am missing - which is always a possibility !
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Speranza - Lagoon 410
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Old 01-07-2005, 16:43   #4
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A better alternitive to the diode is a combiner. I use one for my windless battery up fwd and it stays up all the time. There is no draw unless the the altenator is putting out. With a diode a low battery on the down side will draw from the up side. Id=10001&productId=5461&keyword=143268&y=14&x=17&s toreId=10001&ddkey=SiteSearch

Not advertising for WM, just an idea of cost and a larger unit.
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Old 02-07-2005, 00:54   #5
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paulmar your right. i was worried about the diode connectiing across both banks but i can see now that the diode would block the discharge of the starter battery. the nicest system i've installed in the past is one that has a solenoid that only energizes when the main batteries are showing charged. it then closes the solenoid and charges the other bank hooked up with the solenoid. when the main bank loses a certain set voltage,say 12.5v, it disconnects the solenoid. the nice thing about this is there is no voltage drop in the curcuit unlike a alternator splitter.
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