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post #11 of 14 Old 04-17-2012 Thread Starter
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Re: Battery Switch

The boat is on the hard. I don't launch for a few weeks assuming the new heat exchanger arrives.

I'm leaning towards two std deep cycles. Your summation sounds right, but others have cautioned about changing the battery switch from any position with the engine running. They mentioned momentary movements through the contacts may damage the alternator.

I really need to get my hands around how the boat is wired. The weekend is suppose to be raining so that will give me the opportunity to start pulling wires.

Thanks

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post #12 of 14 Old 04-17-2012
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Re: Battery Switch

I would use a start battery as the start/emergency battery. A dual purpose is just a glorified start battery, not a cycling battery like a true deep cycle.

A deep cycle battery or batteries in the house bank would be my choice, with the least expensive group 24 start battery as the start/emergency battery.
I would start on the house bank. Deep cycle batteries do not have as many cranking amps but in a larger bank or larger battery it is not an issue.

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post #13 of 14 Old 04-17-2012
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Re: Battery Switch

Quote:
Originally Posted by njadventure View Post
I'm leaning towards two std deep cycles. Your summation sounds right, but others have cautioned about changing the battery switch from any position with the engine running. They mentioned momentary movements through the contacts may damage the alternator.

I really need to get my hands around how the boat is wired. The weekend is suppose to be raining so that will give me the opportunity to start pulling wires.

Thanks
If the addition I mentioned - either ACR or Echo Charge - is added and the charging all goes to the house battery the switch can be put in any position including "off" without an issue.

Starting a small diesel can be accomplished easily with almost any size house bank so switching to start is not necessary. It creates the simplest system possible and switching will not cause any issues while the engine is running.

Brian
Living aboard in Victoria Harbour

Last edited by mitiempo; 04-17-2012 at 01:26 PM.
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post #14 of 14 Old 04-17-2012
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Re: Battery Switch

Quote:
Originally Posted by njadventure View Post
I'm leaning towards two std deep cycles. Your summation sounds right, but others have cautioned about changing the battery switch from any position with the engine running. They mentioned momentary movements through the contacts may damage the alternator.
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It's easy to see if changing the battery switch from 1 to 2 or both, etc. will damage the alternator. Just turn on a few cabin lights and then change the switch. If the lights blink off or dim when you change the switch, the alternator can get damaged. If the lights do not change, then the alternator will be fine. This is because some (most) switches are called 'make before break' meaning that they MAKE the new connection before BREAKING the old connection. This means the electric circuit is continued the entire time. Some switches (I have never seen or heard of one but they could be out there) are 'break before make' meaning they BREAK the old connection before MAKING the new connection. In this case, there is no circuit for some time and the alternator power will have no where to go and could damage a diode.

Good luck,
Barry

Barry Lenoble
Deep Blue C, 2002 C&C 110
Mt. Sinai, NY

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