Good Sam Club Open Roads Forum: Tech Issues: 6v series vs. 12v parallel
Open Roads Forum Already a member? Login here.   If not, Register Today!  |  Help

Newest  |  Active  |  Popular  |  RVing FAQ Forum Rules  |  Forum Posting Help and Support  |  Contact  

Search:   Advanced Search

Search only in Tech Issues

Open Roads Forum  >  Tech Issues

 > 6v series vs. 12v parallel

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 4  
Next
Vintage465

Prunedale CA.

Senior Member

Joined: 05/02/2015

View Profile


Offline
Posted: 05/06/17 12:59pm Link  |  Quote  |  Print  |  Notify Moderator

I have the standard 6v/series system on my trailer and find that with 300w of solar and a 30a controller all is good. Reading this article posted below it states that you don't gain amp/hr with 6v series but 12v wired in parallel gives you twice the amp/hr. So why did I spend extra money for the 6v set up when it seems as though you'd get more bang for buck with a couple of 12v deep cycles in parallel? What is it that I'm missing here? There has to be some reason that golf cart manufacturers use the 6v series system.
[image]


V-465
2013 GMC 2500HD Duramax Denali. 2015 CreekSide 20fq w/450 watts solar and 465 amp/hour of batteries. Retired and living the dream!

wnjj

Cornelius, Oregon

Senior Member

Joined: 01/11/2007

View Profile


Offline
Posted: 05/06/17 01:05pm Link  |  Quote  |  Print  |  Notify Moderator

While the article is correct about series and parallel amp-hours, the examples they used are not even close.

A typical group 27 12V battery is around 100 Ah and the 6V of similar size is more than 200. So usually you gain a little going to 6V.

I think the reason golf carts prefer 6V is because the same case only has 3 (2V) cells and therefore the plates are thicker and more rugged.

2oldman

NM

Senior Member

Joined: 04/15/2001

View Profile


Offline
Posted: 05/06/17 01:16pm Link  |  Quote  |  Print  |  Notify Moderator

wnjj wrote:

A typical group 27 12V battery is around 100 Ah and the 6V of similar size is more than 200. So usually you gain a little going to 6V.
x2

The 12v example above is true, but misleading. You are not likely to find a 12v battery (that you can lift) of much over 100ah.

time2roll

Southern California

Senior Member

Joined: 03/21/2005

View Profile



Good Sam RV Club Member


Posted: 05/06/17 01:38pm Link  |  Quote  |  Print  |  Notify Moderator

Misleading to compare GC2 and 8D [emoticon]


2001 F150 SuperCrew
2006 Keystone Springdale 249FWBHLS
675w Solar pictures back up

RoyB

King George, VA

Senior Member

Joined: 04/13/2008

View Profile



Good Sam RV Club Member


Posted: 05/06/17 01:41pm Link  |  Quote  |  Print  |  Notify Moderator

You can get more bank for the bucks up to a point. Thanks to the golf cart world you can find 6vdc 220AH batteries fro around $70-$80 each. Of course you will need two of these 220AH batteries in series to give the 12VDC you need for the trailer. Two 6V 220AH batteries in series will give you 12VDC at 220AHs capacity for $140-$160... Try buying two 12VDC 110Ah Batteries to connect in parallel to give you the 220Ahs capacity for #140 - $160...

You also will see the two 6vDC batteries will weigh more then the two 12VDC batteries which means they will have larger cores inside. This almost directly gives you more RESERVE POWER to use time wise...

That was the way I justified it in my mind...

Personally I would rather have 12VDC batteries in parallel just for the possible rare occasion I have a 6VDC battery failure which would put me dead in the water...

Roy Ken


My Posts are IMHO based on my experiences - Words in CAPS does not mean I am shouting
Roy - Carolyn
RETIRED DOAF/DON/DOD/CONTR RADIO TECH (42yrs)
K9PHT (Since 1957) 146.52M
2010 F150, 5.4,3:73 Gears,SCab
2008 Starcraft 14RT EU2000i GEN
2005 Flagstaff 8528RESS


2oldman

NM

Senior Member

Joined: 04/15/2001

View Profile


Offline
Posted: 05/06/17 01:49pm Link  |  Quote  |  Print  |  Notify Moderator

RoyB wrote:

Personally I would rather have 12VDC batteries in parallel just for the possible rare occasion I have a 6VDC battery failure which would put me dead in the water...
If you plan on running your batteries into the ground before replacement, then 12v is a better choice because one will surely fail first. Catastrophic premature battery failure is extremely unlikely.

You will sacrifice AH capacity for that choice however.

jharrell

Safety Harbor, FL

Full Member

Joined: 10/09/2016

View Profile


Offline
Posted: 05/06/17 01:49pm Link  |  Quote  |  Print  |  Notify Moderator

Lead Acid batteries have basically the same energy density regardless of voltage. A 6V and a 12V of the same size and weight will have basically the same watt-hours. So the 6V will have twice the AH of the 12V at the same size, A*V=W after all.

Not sure why we measure batteries in AH, if you look at Lithium packs for electric cars its all KWH because voltage varies and watt-hours are what matters.


2016 Winnebago Vista 31be - Blue Ox Rear Track Bar - Centramatic Wheel balancers
2016 Jeep Wrangler Unlimited Rubicon Toad - Readybrute Elite Towbar


time2roll

Southern California

Senior Member

Joined: 03/21/2005

View Profile



Good Sam RV Club Member


Posted: 05/06/17 01:53pm Link  |  Quote  |  Print  |  Notify Moderator

I would guess 12v house batteries die suddenly with a shorted cell or something 10x more often than GC2.

I will take my chances on GC2 any day. Besides no one is really on a expedition. Just pick up a new battery on the road if needed.

landyacht318

Near a large body of salty water

Senior Member

Joined: 07/11/2007

View Profile



Posted: 05/06/17 02:10pm Link  |  Quote  |  Print  |  Notify Moderator

[image]

Deep cycle duty calls for deep cycle batteries, not just a sticker on a car jar size 12v battery that says deep cycle.



http://www.pbase.com/mainecruising/deep_cycle_battery&page=1

2oldman

NM

Senior Member

Joined: 04/15/2001

View Profile


Offline
Posted: 05/06/17 02:19pm Link  |  Quote  |  Print  |  Notify Moderator

We've had just a few discussions about this over the years:

12v vs 6v.. which charge faster? 2014
12v or 6 Dec 2013
2- 12v or 6v June 2013
12v vs 6v batteries 2013
12v vs 6v batteries 2006
More 12v vs 6 2006
12v vs 6v 2010
Why 2 6? 2006

Anybody had one 6v fail?2010

maybe 12v is better 2010
12v vs 6v Feb 2010

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 4  
Next

Open Roads Forum  >  Tech Issues

 > 6v series vs. 12v parallel
Search:   Advanced Search

Search only in Tech Issues


New posts No new posts
Closed, new posts Closed, no new posts
Moved, new posts Moved, no new posts

Adjust text size:




© 2021 CWI, Inc. © 2021 Good Sam Enterprises, LLC. All Rights Reserved.