Good Sam Club Open Roads Forum: 2 6v batters VS 2 12v
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 Class A Motorhomes

Open Roads Forum  >  Class A Motorhomes  >  All

 > 2 6v batters VS 2 12v

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 2  
Next
Cocky_Camper

Rock Hill, SC

Senior Member

Joined: 12/02/2006

View Profile


Offline
Posted: 09/04/19 06:24am Link  |  Quote  |  Print  |  Notify Moderator

I just replaced the house batteries in our Sea Breeze after getting 8 years out of them. It had to 6v in it. Just curious, why do some people run two 6 volts instead of parallel 12v?


2004 Sea Breeze by National RV - 8341

Former Coaches:
2006 Keystone Zeppeline 291 - TT
2000 Aerolite Cub F21 - Hybrid TT
1991 Coleman Pop Up

Formerly known as: hybrid_camper

harley-dave

ummm, where are we again..

Senior Member

Joined: 10/19/2011

View Profile





Offline
Posted: 09/04/19 06:37am Link  |  Quote  |  Print  |  Notify Moderator

Mostly because 2 large six volt batteries in series gives you more amp-hours than the 12 V batteries do. For example Our 6V Interstates have a rating of 220 AH (amp/hour) each where a 12V might give 80-90 AH each for a total of only 160-180 AH (example). Plus the deep cycle battery handles deep discharge and recharge better.

Dave


2005 Winnebago-Itasca Sundancer 31C
2010 Harley-Davidson Soft tail Deluxe
2014 Harley-Davidson Street Glide Special
1999 Chevrolet Tracker 4X4
SKP # 121272


2oldman

Ca

Senior Member

Joined: 04/15/2001

View Profile


Offline
Posted: 09/04/19 07:13am Link  |  Quote  |  Print  |  Notify Moderator

6v v 12 2018
6v v 12 2017
6v v 12 2017
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

phemens

Montreal, Canada

Senior Member

Joined: 09/18/2006

View Profile


Offline
Posted: 09/04/19 07:51am Link  |  Quote  |  Print  |  Notify Moderator

It might also depend on your use case. I initially started with a bank of 6v Trojan T-125's, but wasn't satisfied with the voltage drop on heavy inverter draw. I switched to Rolls-Surrette high capacity 12v (210AH) to help mitigate that issue for me.


2012 Dutchman Denali 324LBS behind a 2006 Ford F-250 V10 out of Montreal
1 DW, 1 DD, 1 DS, 2 HD (Hyper Dogs)
1Kw solar, 500 AH LIFePO4, Yamaha EF2000 gen, Samlex 3000w Inverter

pianotuna

Regina, SK, Canada

Senior Member

Joined: 12/18/2004

View Profile


Offline
Posted: 09/04/19 08:27am Link  |  Quote  |  Print  |  Notify Moderator

2oldman thanks for the links.

If a large inverter may be in use, 12 volt jars may have a slight advantage. Part of that may be due to the external series connection required for a 6 volt pair. Another part is 12 volt jars totaling up to the same amp-hour capacity have double the cell count, so each cell is working 1/2 as hard.

The downside is that as cell count rises the possibility of failure rises, too.

True deepcycle 12 volt may be more expensive per amp-hour.

Add some solar panels and your batteries may last even longer.

I'm a fan of AGM jars.


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp hours of AGM in two battery banks 12 volt batteries, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

tropical36

Southwest Florida_USA

Senior Member

Joined: 07/11/2004

View Profile


Offline
Posted: 09/04/19 10:16am Link  |  Quote  |  Print  |  Notify Moderator

harley-dave wrote:

Mostly because 2 large six volt batteries in series gives you more amp-hours than the 12 V batteries do. For example Our 6V Interstates have a rating of 220 AH (amp/hour) each where a 12V might give 80-90 AH each for a total of only 160-180 AH (example). Plus the deep cycle battery handles deep discharge and recharge better.

Dave

Good answer, but keep in mind that pure deep cycle also comes in 12v sizes.


"We are often so caught up in our destination that we forget to appreciate the journey."

07 Revolution LE 40E_Spartan MM_06 400HP C9 CAT_Allison 3000.

Dinghy_2010 Jeep Wrangler JKU ISLANDER.

1998 36ft. National Tropi-Cal Chevy Model 6350 (Sold)


tropical36

Southwest Florida_USA

Senior Member

Joined: 07/11/2004

View Profile


Offline
Posted: 09/04/19 10:29am Link  |  Quote  |  Print  |  Notify Moderator

Cocky_Camper wrote:

I just replaced the house batteries in our Sea Breeze after getting 8 years out of them. It had to 6v in it. Just curious, why do some people run two 6 volts instead of parallel 12v?

Keep in mind that two 6's in series, is just one big 12 and granted, it's big, but then if you only have room for four batteries, you now have just two big 12's, rather than four smaller 12's.
Usually and unless you find some really large 12's that will fit, the four 6's will still have more capacity.
They they found this out, with putting four 12's in golf carts for awhile and have since went back to using six 8's, so again, pure deep cycle comes in multiple voltages.
Then we have the AGM's and my preference and even though expensive, they're maintenance free and don't expel gas. Also the ones that I have, came with a 60 month, replacement warranty, so we'll see how that goes, in a couple of more years.
Mine are four 12v AGM's, neatly connected in parallel obviously and the main reason for going this route, was for keeping it OEM, like the connection diagram on the compartment door and not like we boon dock for days on end, anyway. No matter what, you'll need to run your genset occasionally to keep them up, anyway.

theoldwizard1

SE MI

Senior Member

Joined: 09/07/2010

View Profile


Offline
Posted: 09/04/19 03:44pm Link  |  Quote  |  Print  |  Notify Moderator

harley-dave wrote:

Mostly because 2 large six volt batteries in series gives you more amp-hours than the 12 V batteries do. For example Our 6V Interstates have a rating of 220 AH (amp/hour) each where a 12V might give 80-90 AH each for a total of only 160-180 AH (example). Plus the deep cycle battery handles deep discharge and recharge better.

Despite what the distributors and retail establishments tell you, marine/dual purpose 12V batteries are NOT true deep cycle batteries. The only commonly available TRUE deep cycle batteries are 6V golf cart batteries.

(12V deep cycle batteries DO EXIST, but they are hard to locate (typically special order) and very expensive)

Lwiddis

Los Angeles area :(

Senior Member

Joined: 08/12/2016

View Profile



Good Sam RV Club Member

Offline
Posted: 09/04/19 03:50pm Link  |  Quote  |  Print  |  Notify Moderator

Trojan isn’t a distributor or retailer, wizard. The T1275 is a true deep cycle 12 volt battery.

http://www.trojanbattery.com/product/t-1275/


Winnebago 2101DS TT & 2020 Chevy Silverado 1500 LTZ Z71, 300 watts solar-parallel & MPPT, Trojan T-125s. TALL pole for flags. Prefer USFS, COE, BLM, NPS, TVA, USF&WS, state & county camps. Bicyclist! 14 year Army vet - 11B40 then 11A - (MOS 1542 & 1560)


tropical36

Southwest Florida_USA

Senior Member

Joined: 07/11/2004

View Profile


Offline
Posted: 09/04/19 04:17pm Link  |  Quote  |  Print  |  Notify Moderator

theoldwizard1 wrote:

harley-dave wrote:

Mostly because 2 large six volt batteries in series gives you more amp-hours than the 12 V batteries do. For example Our 6V Interstates have a rating of 220 AH (amp/hour) each where a 12V might give 80-90 AH each for a total of only 160-180 AH (example). Plus the deep cycle battery handles deep discharge and recharge better.

Despite what the distributors and retail establishments tell you, marine/dual purpose 12V batteries are NOT true deep cycle batteries. The only commonly available TRUE deep cycle batteries are 6V golf cart batteries.

(12V deep cycle batteries DO EXIST, but they are hard to locate (typically special order) and very expensive)

Where did you get this idea of 6v only, when you can go to Sam's or Cosco, and buy 8v golf cart batteries, all day long? Same for 12 golf cart batteries, but not so much now, since the industry quit using them for OEM. I'll take a look at Rural King, the next time I'm there for these, as well. As an added note, they haven't made 36v golf carts for years, but there's still many of them out there, including mine, for feeding the battery industry. With the four 12's golf carts, many have since installed the today's standard of six 8's.
Now, gels, are especially good and wouldn't mind having four 12's like these, installed in our coach.... 12v deep cycle gel
You're absolutely correct about marine batteries, not being true deep cycle, in any sense of the word.

* This post was edited 09/04/19 04:36pm by tropical36 *

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 2  
Next

Open Roads Forum  >  Class A Motorhomes  >  All

 > 2 6v batters VS 2 12v
Search:   Advanced Search

Search only in Class A Motorhomes


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

Adjust text size:

© 2019 CWI, Inc. © 2019 Good Sam Enterprises, LLC. All Rights Reserved. | Terms of Use | PRIVACY POLICY | YOUR PRIVACY RIGHTS