6v or 12v batteries - SailNet Community
Reply
 
LinkBack Thread Tools
post #1 of 13 Old 05-04-2014 Thread Starter
Senior Member
 
Join Date: Mar 2013
Posts: 173
Thanks: 12
Thanked 11 Times in 9 Posts
Rep Power: 3
 
6v or 12v batteries

My house batteries have lasted us pretty well as full time liveaboards spending a lot of time at anchor (all summer)
It is now time to change them and I am slightly confused.
We have 4 x 260 amp our batteries which are six volts.
We need more battery power if possible.
What is the best way to get as much power storage as possible?
would it be to go with 4x 6v batteries of 260amp hours or to get 4 x 12v batteries.
The batteries we have are normal wet cell batteries which seem to be the best value for money and as we have a very limited budget we will go the same way.
Are the better know batteries genuinely better than cheaper less well know brands.
Thank you for any advice.

The sea pronounces something, over and over, in a hoarse whisper; I cannot quite make it out..


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Nostrodamus is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 13 Old 05-04-2014
Senior Member
 
celenoglu's Avatar
 
Join Date: Dec 2008
Posts: 672
Thanks: 0
Thanked 14 Times in 13 Posts
Rep Power: 7
 
Re: 6v or 12v batteries

Physically 12 V or 6 V batteries will take nearly the same amount of volume for the same amount of energy. 12V batteries are two 6V batteries connected in the same box.
celenoglu is offline  
Quote Quick Reply Share with Facebook
post #3 of 13 Old 05-04-2014 Thread Starter
Senior Member
 
Join Date: Mar 2013
Posts: 173
Thanks: 12
Thanked 11 Times in 9 Posts
Rep Power: 3
 
Re: 6v or 12v batteries

Quote:
Originally Posted by celenoglu View Post
Physically 12 V or 6 V batteries will take nearly the same amount of volume for the same amount of energy. 12V batteries are two 6V batteries connected in the same box.
Thanks Celenoglu.. there is not too much difference in the price between a 6v and a 12 v so it seems more sense to go for the 12v?

The sea pronounces something, over and over, in a hoarse whisper; I cannot quite make it out..


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Nostrodamus is offline  
Quote Quick Reply Share with Facebook
post #4 of 13 Old 05-04-2014
Senior Member
 
Join Date: Sep 2012
Location: Bremerton, Washington
Posts: 216
Thanks: 5
Thanked 0 Times in 0 Posts
Rep Power: 3
 
6v or 12v batteries

There are tons of threads on this (these) exact topics on SailNet and other forums, so you might do some googling.

I think you will find that 6 volt batteries will give you more AH for your money, as well as being better suited for deep cycling service. As far as cost, consensus seems to be that warehouse batteries (Costco, Sam's Club) are just about as good as the name brands (like Trojan), but for substantially less cost.

1981 Spirit 28 "Bonnie Lass"
Bremerton, Washington

Last edited by Rusty123; 05-04-2014 at 11:08 AM.
Rusty123 is offline  
Quote Quick Reply Share with Facebook
post #5 of 13 Old 05-04-2014
Master Mariner
 
capta's Avatar
 
Join Date: Jun 2011
Location: somewhere in the Windward or Leeward Islands
Posts: 2,242
Thanks: 34
Thanked 110 Times in 105 Posts
Rep Power: 5
 
Re: 6v or 12v batteries

Two 6 volt batteries will give you considerable more amps (hp) than 2 12 volt batteries and you were mentioning that you wanted more power (like Tim, the tool man Taylor?), right? You may be able to find larger capacity 6v batteries with the same footprint, if you look around. If you went to 12 volt batteries, the connections would not be the same as the 2X6v. Caution.

"Any idiot can make a boat go; it takes a sailor to stop one." Spike Africa aboard the schooner Wanderer in Sausalito, Ca. 1964.

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

facebook.com/svskippingstone
Our Videos;

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


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


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
capta is online now  
Quote Quick Reply Share with Facebook
post #6 of 13 Old 05-04-2014
Senior Member
 
Maine Sail's Avatar
 
Join Date: Jan 2003
Location: Maine Coast
Posts: 5,887
Thanks: 20
Thanked 222 Times in 169 Posts
Rep Power: 16
       
Re: 6v or 12v batteries

Quote:
Originally Posted by Nostrodamus View Post
there is not too much difference in the price between a 6v and a 12 v so it seems more sense to go for the 12v?
On the contrary, there are HUGE differences between typical 12V "marine batteries" and 6V deep cycle batteries.

When buying batteries one must consider well beyond just Ah capacity. The most critical aspect to longevity will be the cycle life or how many cycles to 50% DOD you can pull off.

Most all 12V "deep cycle" marine batteries are imposters including top end brands like the Trojan 12V G-24, G-27 & G-31... They are not a true deep cycle battery and will yield far less cycles than a 6V GC2 battery.

Some brands will give more cycles than others in these group sizes but none compete directly with a GC2 in terms of cycle life..

You are not just buying Ah capacity you are buying cycle life. There are 12V golf cart batteries such as the Trojan T1275, and they do have the same cycle life as a 6V, but they are also taller, like the 6V, and a built to use the same plates as a GC2 battery. Group 24, 27 & 31 batteries simply do not have the plate thickness a GC2 battery does.....

For example in the Deka / Sea Volt / West Marine line you have starting, dual purpose and deep cycle G-24, 27 & 31 12V batteries which all share the same case.

However, they are only really deep cycle when compared to the starting or dual purpose batteries which share the identical case. They are not deep cycle when compared to the GC2 or other true deep cycle batteries..

Here's the data across the Deka / East Penn / West Marine line up:

Flooded Batteries - Group 24, 27, 31 & 6V GC2

12V Starting - Cycles to 50% = Not Rated
12V Dual Purpose - Cycles to 50% = 200
12V Deep Cycle - Cycles to 50% = 350
6V Golf Cart - Cycle to 50% = 700-1000


*Note: The above are LAB RATED cycles. Expect at least 50% less in the real world..


As you can see the 12V "deep cycle" battery is only a "deep cycle" when compared to the starting or dual purpose batteries it shares a case with. If you absolutely must buy a 12V Group 24, 27 or 31 buy the deep cycle version. In many cases this is all that will fit. It is easy to see that these are NOT deep cycle when compared to a real deep cycle battery.

The only ones that have lab rated cycles the same or close, to their own brands 6V batteries, are Lifeline and the US Battery DCXC 12V series (at least those are the claims). I know of no other brand that will rate their G-24, G-27 or G-31 at even half the cycles of their GC2 6V batteries. The Deka / East Penn / WM product is less than half and these are by far the most popular marine batteries out there....

______
-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.


Maine Sail is offline  
Quote Quick Reply Share with Facebook
post #7 of 13 Old 05-04-2014
Reward for lost Kraken!
 
hellosailor's Avatar
 
Join Date: Apr 2006
Posts: 11,544
Thanks: 6
Thanked 137 Times in 134 Posts
Rep Power: 11
   
Re: 6v or 12v batteries

"What is the best way to get as much power storage as possible?"
I'm glad you asked that question.

The best way far and away the best way, is for you to give me all of your money, all the gold, all the cattle, all the women too, and I'll send you back some batteries. That's best for both of us.

Now, if you have any constraints, this is the time to say them. Any constraints on space, restricting battery size or height? Any requirements for, say, total capacity versus budget? And do intend to keep your outstanding, or obsolete, charging system? Or perhaps, switch to Lithium in order to get the most amps in the least space, while investing a lot more money in the batteries AND a new charging system and BMS to go with them?

Don't worry, we can discuss these things at length, while the women and gold and cattle are in transit. That's "best", really.
hellosailor is offline  
Quote Quick Reply Share with Facebook
post #8 of 13 Old 05-04-2014 Thread Starter
Senior Member
 
Join Date: Mar 2013
Posts: 173
Thanks: 12
Thanked 11 Times in 9 Posts
Rep Power: 3
 
Re: 6v or 12v batteries

Quote:
Originally Posted by hellosailor View Post
"What is the best way to get as much power storage as possible?"
I'm glad you asked that question.

The best way far and away the best way, is for you to give me all of your money, all the gold, all the cattle, all the women too, and I'll send you back some batteries. That's best for both of us.

Now, if you have any constraints, this is the time to say them. Any constraints on space, restricting battery size or height? Any requirements for, say, total capacity versus budget? And do intend to keep your outstanding, or obsolete, charging system? Or perhaps, switch to Lithium in order to get the most amps in the least space, while investing a lot more money in the batteries AND a new charging system and BMS to go with them?

Don't worry, we can discuss these things at length, while the women and gold and cattle are in transit. That's "best", really.
Sounds a good deal, I have no gold, no cattle and a woman that castrates me on a monday and sows it back on on Sunday so she can do the same again. She does this as she knows I will do at least one thing wrong every minute (even when I sleep). She is on her way to you ... I presume my Lithium batteries are in transit.

The sea pronounces something, over and over, in a hoarse whisper; I cannot quite make it out..


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Nostrodamus is offline  
Quote Quick Reply Share with Facebook
post #9 of 13 Old 05-04-2014
Senior Member
 
mitiempo's Avatar
 
Join Date: Sep 2008
Location: Victoria B.C. Canada
Posts: 7,509
Thanks: 0
Thanked 96 Times in 87 Posts
Rep Power: 8
   
Re: 6v or 12v batteries

Agree with Mainesail totally.

If you have room use six 6 volt golf cart batteries to make a bank 1.5 times as large as before. If you have height you could go with 4 L-16 6 volt batteries - about 370 AH each for a total of 740 AH. They are built as well as smaller golf cart batteries but are a little longer and almost 18" high.

Trojan Battery Company

Brian
Living aboard in Victoria Harbour
mitiempo is offline  
Quote Quick Reply Share with Facebook
post #10 of 13 Old 05-05-2014 Thread Starter
Senior Member
 
Join Date: Mar 2013
Posts: 173
Thanks: 12
Thanked 11 Times in 9 Posts
Rep Power: 3
 
Re: 6v or 12v batteries

Quote:
Originally Posted by mitiempo View Post
Agree with Mainesail totally.

If you have room use six 6 volt golf cart batteries to make a bank 1.5 times as large as before. If you have height you could go with 4 L-16 6 volt batteries - about 370 AH each for a total of 740 AH. They are built as well as smaller golf cart batteries but are a little longer and almost 18" high.

Trojan Battery Company
Thank you to every one for their help and advice. Looking at the options and room available I think the best thing for me would be to go with the T105's 6v and increase the batteries from 4 to 6 to give me the extra power.
Again thank you for all your replies and advice.

The sea pronounces something, over and over, in a hoarse whisper; I cannot quite make it out..


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Nostrodamus is offline  
Quote Quick Reply 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:
OR

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
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Use for 12V Batteries? ericb760 Gear & Maintenance 12 02-27-2014 12:00 PM
12v Fans......? F15EWSO Cruising & Liveaboard Forum 17 05-15-2013 12:06 PM
12V Panel help labestia Bavaria 3 07-29-2011 03:51 AM
Changing 6V to 12V Batteries kevandraper General Discussion (sailing related) 6 10-25-2010 01:20 PM
Buying 12V Batteries in Europe salsman Gear & Maintenance 8 03-04-2007 04:46 PM

Posting Rules  
You may post new threads
You may 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome