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Old 09-26-2011
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anderbra is on a distinguished road
Switching Batteries

A couple of years ago I fried an alternator by switching from the starter to the house batteries while the engine was running, even though I went thru "both". Before replacing the switch which could be faulty, I, since then, start the engine with the switch set on "both". It has worked well for me so far.

Now that I've retired and will anchor for longer periods (on house battery only) I'm wondering; if the house batteries are too low, placing the switch on "both" position will level the power between the house and starter batteries before I get the engine running? and therefore leaving me without enough power to start the engine.

For the record; I have two 6V = 12V for house and one 12V for starter. It's obvious that electrical is foreign to me, so please KISS.

Tank you for any feedback.
SV Strudel, Niagara 31
Not all who wander are lost.
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Old 09-26-2011
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KISS = Just start your engine and do everything on the house bank.

You have plenty of juice there to do that so long as you're not dropping the bank below 50% state of charge. This is much easier than constantly switching back and forth..
-Maine Sail / CS-36T

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Old 09-26-2011
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HI Andr

on my bene 390 I have the alternator charg going to the start battery and then i have a battery disconect switch which connects the house bank.
When i want to put charge in the house bank i just connect the banks together with the switch. in this way the alternator can never get disconnected. This way is simple and reliable but you do have to remember to turn the switch off when you shut the engine off.

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