SailNet Community - Reply to Topic
Thread: Battery Switch Reply to Thread
Send Trackbacks to (Separate multiple URLs with spaces) :
Post Icons
You may choose an icon for your message from the following list:

Register Now

In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

  Additional Options
Miscellaneous Options

Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below

  Topic Review (Newest First)
08-29-2013 04:41 PM
Re: Battery Switch

Thanks everyone for replying. Thanks especially, Stu, for the article references. The Main Sail "article" was especially helpful.

This is one of the best things about this forum. Friendly folk offering good advice and personal experience. Thanks again!
08-28-2013 08:42 PM
Stu Jackson
Re: Battery Switch

Basic Battery Wiring Diagrams This is a very good basic primer for boat system wiring: Basic Battery Wiring Diagrams

This is another very good basic primer for boat system wiring: The 1-2-B Switch by Maine Sail (brings together a lot of what this subject is all about)
1/BOTH/2/OFF Switches Thoughts & Musings -

You might also be interested in this one, too

Electrical Systems 101 Electrical Systems 101
08-28-2013 04:53 PM
Re: Battery Switch

On our Tanzer 28 we had two deep cycle batteries. One was "1" and the other was "2". When we came down we started it on "both" and then left it there.

Like Johnny - on our IC34 we have two deep cycle in parallel and a third, a "spare" (only if we need it battery). The two in parallel are "1" and the spare is "2".
08-28-2013 02:01 PM
Re: Battery Switch

You can have either two batteries (or banks of batteries) - each one capable of running your house 12v systems and starting the engine; or have one battery for the house and one battery dedicated for starting the engine. Deep discharge batteries are preferable for house needs and starting batteries are preferable for starting the engine.

I recently had two identical large deep cycle batteries on my boat - one was battery 1 and the other was battery 2. Couple of years ago, I wired these two batteries togther, effectively making one double-sized battery and installed another dedicated starter battery.
08-28-2013 01:56 PM
Battery Switch

Okay, this is obviously a newb question, but here goes:
My S2 has a place for two batteries and a switch with positions for 1, 2, 1 and 2 , and off. Should I be using one of the batteries for the "house" battery (lights, etc) and the other just for starting the engine? Should the batteries be the same type and size? How do others have their batteries set up and use this switch?

Thanks. I have a lot to learn.

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

For the best viewing experience please update your browser to Google Chrome