Cruisers Forum

  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
Thread Tools Search this Thread Rate Thread Display Modes
Old 09-08-2010, 06:02   #1
Registered User

Join Date: May 2010
Posts: 40
Best Value AGM Battery Configuration

I've more or less decided on a particular brand of battery however just pondering the number, AH and voltage to get. I have a large battery box so thats not really a limitation. I'm looking at between 400 and 600AH total for a house bank. I thought I'd be paying the same $ per AH but the cost varies significantly depending on the battery model selected.
Option 1 - 2 x 400AH 6v (400AH total) $942 ($2.36 AH)
Option 2 - 4 X 120AH (480AH total) 12v $1340 ($2.79 AH)
Option 3 - 2 x 260AH (520AH total) 12v $1608 ($3.09 AH)

Per AH having 260AH batteries are just over 30% more expensive than the 400AHs in option 1. Is there any reason to pay the additional 30% per AH for the 12v 260AH batteries? I've heard that if a cell fails in a battery in series the whole bank fails where as a bank in parallel is more forgiving but is that risk worth paying 30% more.
Or is going with option 2 where you have more batteries in parallel a better option. At least would be a easier to lift in and out of the boat.
Also the 400AH 6v batteries provide 3.5AH per kg where as the 260AH provide 2.9AH per KG.
On the face of it the 6v batteries in series are significantly cheaper and lighter than the 12v batteries on an AH basis.
Am I missing something? Is there some other issue with 6v batteries. For this particular company they must be cheaper to manufacture and more efficient than 12v batteries.
bobox is offline   Reply With Quote

agm, battery

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not 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 Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
AGM Battery / Charging Issues Captain Bill Electrical: Batteries, Generators & Solar 13 05-10-2010 15:53
AGM Batteries and Battery Box Steve Kidson Electrical: Batteries, Generators & Solar 14 18-05-2010 06:30
AGM Battery Bank Failure - Help ! svladybug Electrical: Batteries, Generators & Solar 7 16-05-2010 18:18
Berth Configuration? NotJustDreaming Multihull Sailboats 1 20-02-2010 19:14
charger for AGM battery Hehghse12 Electrical: Batteries, Generators & Solar 3 31-12-2008 11:46

Advertise Here

All times are GMT -7. The time now is 19:50.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2022, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2022, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.