Mixing batteries? - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance
 Not a Member? 
  #1  
Old 12-31-2008
JSailer's Avatar
Member
 
Join Date: Mar 2005
Location: Stuart, FL
Posts: 99
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 10
JSailer is on a distinguished road
Mixing batteries?

Hello,
I need to know if it is ok to replace an existing (bad) 12v wet cell battery with 2 golf cart batteries while still keeping a 12v wet cell starting battery?
If so, is there any particular wiring issue or simply put the 2 6v in series?
Thanks.
Reply With Quote Share with Facebook
  #2  
Old 12-31-2008
Barking Dog
 
Join Date: Nov 2005
Location: Boston
Posts: 236
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 9
KindOfBlue is on a distinguished road
Do a search on this site for battery and you will find a thousand different configurations, most of which are supported/correct. I think that the answer depends on how you plan or if you plan to have the existing wet cell connected to the golf cart (also wet cell) batteries.

I don't think that you can simply just slide the 2 new new batteries in series into place as it charges at a different rate than the existing battery.
__________________
Craig

Last edited by KindOfBlue; 12-31-2008 at 06:21 PM.
Reply With Quote Share with Facebook
  #3  
Old 12-31-2008
Senior Member
 
Join Date: Jul 2001
Posts: 1,174
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 14
k1vsk will become famous soon enough
the simple answer is that you are fine if you isolate the new batteries as a house bank and use your good 12 V as a start battery and don't try charging them as a group unless your charger is properly configured to differentiate.

Some chargers can't tell what or how many batteries are in line and charges them regardless of their individual state.
Reply With Quote Share with Facebook
  #4  
Old 12-31-2008
chucklesR's Avatar
Senior Member
 
Join Date: Sep 2007
Location: Pasadena Md - Magothy side
Posts: 5,977
Thanks: 10
Thanked 30 Times in 30 Posts
Rep Power: 9
chucklesR is a jewel in the rough chucklesR is a jewel in the rough chucklesR is a jewel in the rough
In the should and could category, you SHOULD have a bank of batteries that are composed of the same type and same capacity, ideally the same age batteries.
You could mix them up, doing so will cause them to charge and discharge badly (meaning damage them).
Reply With Quote Share with Facebook
  #5  
Old 12-31-2008
Senior Member
 
Join Date: Aug 2006
Location: wherever
Posts: 5,258
Thanks: 8
Thanked 17 Times in 16 Posts
Rep Power: 11
xort has a spectacular aura about xort has a spectacular aura about xort has a spectacular aura about
What you should do is buy Nigel Calders book; complete guide to sailboat maintenance and repair. He goes into great depth on battery use, charging, configuration, etc. etc. etc. Everything you'll need to know. Well laid out in detail with all the facts and figures.

find out the real experts opinion.
Reply With Quote Share with Facebook
  #6  
Old 12-31-2008
chucklesR's Avatar
Senior Member
 
Join Date: Sep 2007
Location: Pasadena Md - Magothy side
Posts: 5,977
Thanks: 10
Thanked 30 Times in 30 Posts
Rep Power: 9
chucklesR is a jewel in the rough chucklesR is a jewel in the rough chucklesR is a jewel in the rough
xort,
I just parrotted Nigel's opinion. He is my source of knowledge for all things electrical and mechanical on a boat.
Reply With Quote Share with Facebook
  #7  
Old 12-31-2008
camaraderie's Avatar
moderate?
 
Join Date: May 2002
Location: East Coast
Posts: 13,878
Thanks: 0
Thanked 2 Times in 2 Posts
Rep Power: 15
camaraderie is a jewel in the rough camaraderie is a jewel in the rough camaraderie is a jewel in the rough
I am assuming the 6v batteries are wet cells as well.
You may simply substitute them for the dead 12V battery and wire them in series. There is NO issue as the regulator sees them as the same 12V load.
This assumes the existing starting battery is is excellent shape. It is not a good idea to combine a battery on its' last legs with new batteries.
__________________
No longer posting. Reach me by PM!
Reply With Quote Share with Facebook
  #8  
Old 12-31-2008
sailingdog's Avatar
Telstar 28
 
Join Date: Mar 2006
Location: New England
Posts: 43,291
Thanks: 0
Thanked 9 Times in 9 Posts
Rep Power: 13
sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice
Should be fine.
__________________
Sailingdog

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
Reply With Quote Share with Facebook
  #9  
Old 12-31-2008
JSailer's Avatar
Member
 
Join Date: Mar 2005
Location: Stuart, FL
Posts: 99
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 10
JSailer is on a distinguished road
Wow, you guys are fast. Way to end the year!!!
Thanks.
Reply With Quote Share with Facebook
  #10  
Old 01-02-2009
JSailer's Avatar
Member
 
Join Date: Mar 2005
Location: Stuart, FL
Posts: 99
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 10
JSailer is on a distinguished road
Ok, I guess I'm not quite done with this...
After reading more on the deep cycle batteries and going through Don Casey's book, I have further questions:
I will be using the house battery for the usual day sail requirements and occasional weekend overnight (anchor lights, water pump and eventually car stereo) in South Florida.
Since my motoring time is very short, I am worried I won't be recharging the battery enough between overnights (I currently do not have a way to chahrge the batteries at the dock). I do not know my alternator's capacity but will check on it later on. (Atomic 4, on a 30' O'day).
So, should I look into other types of batteries? I'm looking at the Dual Purpose batteries sold at WM.
Also, is an AGM for house ok if I have a wet cell Starting battery? I'm thinking not but I want to make sure as many batteries I see advertised seem to be AGM.
Reply With Quote Share with Facebook
Reply


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
Mixing 6-volt and 12-volt Batteries? captainfrank Gear & Maintenance 3 11-08-2008 11:33 AM
Paralleling Batteries dave.verry Gear & Maintenance 79 11-27-2006 11:19 AM


All times are GMT -4. The time now is 08:19 PM.

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.