Dual Battery Installation - SailNet Community
LinkBack Thread Tools
post #1 of 2 Old 03-25-2002 Thread Starter
Junior Member
Join Date: Jan 2002
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
Dual Battery Installation

I currently own a 7.3 S2 sloop with a Johnson 9.9 Outboard. There are times I go on an overnite and the single house battery I have will not last two full days. Is there any way that I can use my outboard to charge my single battery? If there isn''t, I would like to hook up a second battery. I have another main switch I can install that has the option for using the #1 battery, the #2 battery or both. My current GUEST battery charger is only a single bank charger. I assume I will need to get a charger that can charge two banks at one time.

1.) Are there any suggestions on how I should wire in the second battery?
2.) How about feedback on the type of charger I should get?
3.) Is there some special hints in hooking up some type of diode to prevent the inadvertant discharge of one of the baterries?
4.) Are there any references I can use to evaluate wiring/hook-up options?

Urband is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
post #2 of 2 Old 03-25-2002
Join Date: Feb 2002
Posts: 57
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 14
Dual Battery Installation

I''ll try to keep it clear. I don''t think a 9.9 O/B has an alternator unless it has a battery starter. If it does then it can be used to charge both batteries. Wal-Mart and most auto parts stores have battery isolaters. They''re the same as tho one''s at marine suppliers but are usually a little less money. They''re pretty simple to hook in. If you have no alternator. Install the switch. You can set the switch to all and your charger will charge both batteries simultaniously. I suggest at least a 30 amp automatic charger as a smaller one will take all day and all night to top off most deep cycle batteries. I use a D8 for the house. It lasts more than a night or two for sure. I seperate my house from the Nav lighting and Nav equipment too. Perko has an over-kill sized switch for a system your size that most boats use with multiple batteries. They too come with simple instructions for installation. I''ve never seen a failsafe system for the inadvertant. If all your using your batt''s for is lighting and Nav equipment you don''t need any wire larger than 10 gauge to hook it all in with.
Hope I helped.
Ole Pete
Peter_pan is offline  
Quote Quick Reply Share with Facebook

Quick Reply

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

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.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

Similar Threads
Thread Thread Starter Forum Replies Last Post
Battery Charger / Maintainer Tree Gear & Maintenance 6 10-26-2004 11:53 PM
Battery loses charge svzephyr44 Gear & Maintenance 1 09-28-2004 03:20 PM
Battery Switch johar Gear & Maintenance 4 04-08-2003 05:28 PM
Adding 2nd Battery...help redbeard58 Gear & Maintenance 2 03-03-2003 07:13 PM
Inverter Installation MSam Gear & Maintenance 2 04-07-2002 05:14 PM

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
Trackbacks are On
Pingbacks are On
Refbacks are On

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