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 second battery hook-up with switch		  New Topic  Topic Locked
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dave holtgrave
Captain

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USA
427 Posts
Initially Posted - 12/06/2001 :  18:31:50  Show Profile
as i sit on the beaches in destin for a week i started to think of all the projects for my catalina 25 next year.
i went to west marine and got a switch for adding a second battery.
i have an electric start that i will also want to add to the switch
do
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andy p
1st Mate

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55 Posts
Response Posted - 12/06/2001 :  21:58:23  Show Profile
The West Marine catalog had a "West Advisor" on this topic. You can probably get the same info (and an exact diagram) from their web site. Their solution is very good: "A" battery is exclusively for the starter and "B" for the cabin service and a simple
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Champipple
Master Marine Consultant

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USA
6855 Posts
Response Posted - 12/07/2001 :  08:23:55  Show Profile  Visit Champipple's Homepage
Dave,

The Battery switch (a-b, a , b or off) works fine with for selecting which battery you wish to use. There are a bunch of electrical engineers on this board and since I don't want to make a mistake I will leave responee this simple and let them fi
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andy p
1st Mate

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55 Posts
Response Posted - 12/07/2001 :  10:41:17  Show Profile
The main problem with the A-B-Off-Both switch is that you can easily destroy expensive onboard electronics with the switch set incorrectly. Here's part of what West Marine says about it (see their web site for the rest)...

"We strongly recommend that
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Bristle
Admiral

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USA
834 Posts
Response Posted - 12/07/2001 :  15:35:30  Show Profile
Without an A-B switch, how do you charge either or both batteries--for example, off the outboard alternator? Is it best just to switch to parallel for charging?

Dave Bristle, 1985 C-25 SR-FK #5032 "Passage" in CT
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Champipple
Master Marine Consultant

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USA
6855 Posts
Response Posted - 12/07/2001 :  17:06:16  Show Profile  Visit Champipple's Homepage
<BLOCKQUOTE id=quote><font size=1 face="Verdana, Arial, Helvetica" id=quote>quote:<hr height=1 noshade id=quote>
Without an A-B switch, how do you charge either or both batteries--for example, off the outboard alternator? Is it best just to switch to pa
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Champipple
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6855 Posts
Response Posted - 12/07/2001 :  17:07:17  Show Profile  Visit Champipple's Homepage
<BLOCKQUOTE id=quote><font size=1 face="Verdana, Arial, Helvetica" id=quote>quote:<hr height=1 noshade id=quote>
The main problem with the A-B-Off-Both switch is that you can easily destroy expensive onboard electronics with the switch set incorrectly.
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andy p
1st Mate

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55 Posts
Response Posted - 12/07/2001 :  17:59:57  Show Profile
More from West Advisor...

"Your "ideal" system may or may not require all of these components. What's important is that the
total system meets your daily electrical needs with sufficient battery capacity and charging ability.
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n/a
deleted

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31 Posts
Response Posted - 12/07/2001 :  23:17:14  Show Profile

I know this is useless without specific information but unless I misread the instructions on my battery charger it states both batteries must be charged at once with the selector on both. Charging only one would damage the charger....I've got to dig th
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andy p
1st Mate

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55 Posts
Response Posted - 12/08/2001 :  10:52:47  Show Profile
Perhaps some civic minded electrical engineer on the forum could use their lunch break to sketch out the exact circuit (maybe one using the A-B-Off-Both switch and another using the West 3-switch plan) that included...

1) Two batteries
2) Starter moto
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Doug
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USA
457 Posts
Response Posted - 12/08/2001 :  12:48:41  Show Profile
I have a bit more basic question: What is everyone running that requires two batteries? We liberally run lights, VHF, and wind/depth gauges and the battery can easily do a 14 day trip without a charge.
Also, where is that second battery stored?

Doug
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n/a
deleted

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31 Posts
Response Posted - 12/08/2001 :  17:15:49  Show Profile
Doug. You are obviously the self assured..nothing can go wrong type. I like the 2nd battery so I can run my lights, radio ect. without the danger of running the battery down and not being able to use my electric starter. I know it starts with the pull
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Leon Sisson
Master Marine Consultant

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USA
1893 Posts
Response Posted - 12/08/2001 :  19:43:15  Show Profile  Visit Leon Sisson's Homepage

For Andy P., who asked:
<BLOCKQUOTE id=quote><font size=1 face="Verdana, Arial, Helvetica" id=quote>quote:<hr height=1 noshade id=quote>... use their lunch break to sketch out the exact circuit (maybe one using the A-B-Off-Both switch and another using
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Champipple
Master Marine Consultant

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USA
6855 Posts
Response Posted - 12/10/2001 :  08:19:06  Show Profile  Visit Champipple's Homepage
<BLOCKQUOTE id=quote><font size=1 face="Verdana, Arial, Helvetica" id=quote>quote:<hr height=1 noshade id=quote>
I have a bit more basic question: What is everyone running that requires two batteries? We liberally run lights, VHF, and wind/depth gauges a
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andy p
1st Mate

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55 Posts
Response Posted - 12/10/2001 :  09:31:50  Show Profile
Thank you, Leon.
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
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