Advantage 6V Series vs 12V Parrallel Bank - 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 > Electrical Systems
 Not a Member? 
Old 08-30-2011
Join Date: Jul 2011
Location: Hampton Roads, VA
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
Wanderer2011 is on a distinguished road
Advantage 6V Series vs 12V Parrallel Bank

Ok, what is the Pro's/Con's of 6V Series or 12v Parrallel Battery bank setup, other than price.

Looking at this:
Bank 1: 2 T-125 (6v) in Series 240AH total


Bank 1: 2 SCS200 (12v) in Parrallel 230 AH total

Second bank will be built later with the same configuration as Bank 1
BMV600 will monitor Bank 1.
Xantex battery charger will be setup to charge both battery banks, through EchoCharger
One bank will be on Port side (1) the other STarboard side (2).

I have a load plan for the electrical an this will meet my needs, and I'll be using the bank to start a M18 diesel engine.

Thanks in advance.
Reply With Quote Quick reply to this message Share with Facebook
Old 08-30-2011
night0wl's Avatar
Senior Member
Join Date: Mar 2006
Location: Fort Lauderdale
Posts: 1,409
Thanks: 0
Thanked 18 Times in 18 Posts
Rep Power: 9
night0wl is on a distinguished road
If you can only fit 2 batteries, then I would go with a Bank of the SCS200 (12v) in parallel.

Here is the reason. If you're using this as your one and only bank, and a single cell goes bad (which ruins the battery that the cell is in), then in your first setup (6v in series), you will lose the *ENTIRE* battery bank as most electronics require 12v.

In a 2 x 12v battery in parallel setup (your second scenario) if you lose a battery due to a bad cell, at least you have 1 additional battery that is capable of putting out 12v allowing you to limp home. Sure your capacity is diminished, but this is an emergency situation...and a prudent sailor tries to prepare.

Ideally, in a long term cruising scenario, I would have 4 x 6v batteries wired in series/parallel. This would give me 2 x 12 banks totalling ~400 amp hours. This is a lot of weight and the cabling and charging equipment can be expensive and require upgrades, as well as the ongoing battery maintenance....however I would have the most peace of mind with that setup that my bank(s) can provide the capacity and redundancy I seek.
S/V Jendai
Beneteau 343

Last edited by night0wl; 08-30-2011 at 02:10 PM.
Reply With Quote Quick reply to this message Share with Facebook
Old 08-30-2011
mitiempo's Avatar
Senior Member
Join Date: Sep 2008
Location: Victoria B.C. Canada
Posts: 7,284
Thanks: 0
Thanked 79 Times in 70 Posts
Rep Power: 8
mitiempo will become famous soon enough mitiempo will become famous soon enough
While the above post is true, the 6 volt "golf cart" type batteries have thicker plates and will outlast most 12 volt batteries by quite a large margin.

A good solution would be a bank of two 6 volt golf carts in series (or 4 in series/parallel) and a separate 12 volt battery for engine starting or emergency use.
Living aboard in Victoria Harbour
Reply With Quote Quick reply to this message Share with Facebook
Old 08-30-2011
Senior Member
Join Date: Aug 2006
Location: Arlington, VA
Posts: 1,813
Thanks: 0
Thanked 4 Times in 4 Posts
Rep Power: 10
btrayfors will become famous soon enough btrayfors will become famous soon enough
+1 what Brian said.

Also, don't wait too long to get the second bank. And, when you do, consider linking them all together as one big house bank. With a separate start battery, as Brian suggested, maintained by an EchoCharge.

Reply With Quote Quick reply to this message 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

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
4 solar panels - series, parallel or series-parallel ArgleBargle Gear & Maintenance 1 04-26-2011 09:27 AM
The unthought advantage of a wing keel KindOfBlue General Discussion (sailing related) 4 07-25-2009 07:19 PM
Boat as Second Hone Tax Advantage? CapnSantiago General Discussion (sailing related) 20 07-24-2007 11:07 PM
Sailing: Britons must consolidate advantage (Daily Telegraph) NewsReader News Feeds 0 01-26-2007 09:15 PM

All times are GMT -4. The time now is 08:08 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) LLC 2000-2012

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