Question about unevenly-sized battery banks - 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 > Electrical Systems
 Not a Member? 
  #1  
Old 10-31-2012
Senior Member
 
Join Date: Feb 2011
Location: San Francisco Bay area
Posts: 2,296
Thanks: 2
Thanked 45 Times in 45 Posts
Rep Power: 4
MarkSF is on a distinguished road
Question about unevenly-sized battery banks

With the modern distributed-power chargers (I have a Xantrex TrueCharge 20A) is it acceptable to have unevenly-sized banks?

I would like to have two group 24s on one bank, and a group 27 on the other.

I currently have two 24s and two 27s which are on their last legs. To save some weight I would like to ditch one of the batteries. (adding a 60lb outboard to the stern rail so losing one battery would keep her on her lines)

Mostly daysailing so don't need a ton of capacity.
__________________
1984 Bristol 31.1
Alameda, California, USA
Reply With Quote Quick reply to this message Share with Facebook
  #2  
Old 10-31-2012
asdf38's Avatar
Senior Member
 
Join Date: Jul 2010
Posts: 724
Thanks: 1
Thanked 8 Times in 8 Posts
Rep Power: 5
asdf38 is on a distinguished road
Re: Question about unevenly-sized battery banks

You already had unevenly sized banks when you had two G27 and two G24s. The batteries in a bank are hard wired together and appear to the charger as a single large battery. The fact that you have one battery in one bank and two in the other is unknown and irrelevant to the charger. Also since you're going down in capacity you'll be fine. The more complicated scenario is if you had different battery chemistry (ie gel in one bank and lead-acid in another), but uneven bank capacity should be fine.
Reply With Quote Quick reply to this message Share with Facebook
  #3  
Old 10-31-2012
Maine Sail's Avatar
Senior Member
 
Join Date: Jan 2003
Location: Maine Coast
Posts: 5,530
Thanks: 13
Thanked 147 Times in 113 Posts
Rep Power: 15
Maine Sail is just really nice Maine Sail is just really nice Maine Sail is just really nice Maine Sail is just really nice
Re: Question about unevenly-sized battery banks

Quote:
Originally Posted by MarkSF View Post
With the modern distributed-power chargers (I have a Xantrex TrueCharge 20A) is it acceptable to have unevenly-sized banks?

I would like to have two group 24s on one bank, and a group 27 on the other.

I currently have two 24s and two 27s which are on their last legs. To save some weight I would like to ditch one of the batteries. (adding a 60lb outboard to the stern rail so losing one battery would keep her on her lines)

Mostly daysailing so don't need a ton of capacity.
Not an issue the current will flow where it is needed. However, despite having two outputs you still only have one charger and one voltage.

Because you only have one charger, mixing lead acid battery types such as GEL and Flooded or a battery that needs 14.8V, such as some Trojan deep cycles, and a battery that only wants 14.4V becomes problematic and you either over charge one or under charge the other. If the batteries take the same voltage, no worries..
__________________
______
-Maine Sail / CS-36T


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




© Images In Posts Property of Compass Marine Inc.


Reply With Quote Quick reply to this message Share with Facebook
  #4  
Old 10-31-2012
Senior Member
 
Join Date: Feb 2011
Location: San Francisco Bay area
Posts: 2,296
Thanks: 2
Thanked 45 Times in 45 Posts
Rep Power: 4
MarkSF is on a distinguished road
Re: Question about unevenly-sized battery banks

Thanks for the replies. good to know.
__________________
1984 Bristol 31.1
Alameda, California, USA
Reply With Quote Quick reply to this message Share with Facebook
Reply

Quick Reply
Message:
Options

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:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

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

 
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 banks must be the same or can be different? edwmama Electrical Systems 6 11-16-2010 03:39 AM
Battery Banks islands50 Gear & Maintenance 2 04-19-2010 09:52 AM
Battery Chargers for Multiple Battery Banks btrayfors Electrical Systems 5 11-15-2009 12:57 PM
Battery Banks 1 or 2 SimonV Gear & Maintenance 9 10-25-2007 10:25 PM
Mother of All Battery Banks? Shack Gear & Maintenance 9 09-09-2006 06:52 PM


All times are GMT -4. The time now is 01:27 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.