Dual Battery Installation - SailNet Community

   Search Sailnet:

 forums  store  

Quick Menu
Boat Reviews  
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Hatches and Portlights
Interior And Galley
Marine Electronics
Other Items
Plumbing and Pumps
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here

Go Back   SailNet Community > On Board > Gear & Maintenance
 Not a Member? 
Old 03-25-2002
Junior Member
Join Date: Jan 2002
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
Urband is on a distinguished road
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?

Reply With Quote Share with Facebook
Old 03-25-2002
Join Date: Feb 2002
Posts: 57
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 13
Peter_pan is on a distinguished road
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
Reply With Quote Share with Facebook

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Battery Charger / Maintainer Tree Gear & Maintenance 6 10-26-2004 10:53 PM
Battery loses charge svzephyr44 Gear & Maintenance 1 09-28-2004 02:20 PM
Battery Switch johar Gear & Maintenance 4 04-08-2003 04:28 PM
Adding 2nd Battery...help redbeard58 Gear & Maintenance 2 03-03-2003 06:13 PM
Inverter Installation MSam Gear & Maintenance 2 04-07-2002 04:14 PM

All times are GMT -4. The time now is 05:16 AM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.