Trailer Life Magazine Open Roads Forum: Two 6 volt batteries or two 12 volt batteries ??
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 Travel Trailers

Open Roads Forum  >  Travel Trailers  >  General Q&A

 > Two 6 volt batteries or two 12 volt batteries ??

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 10  
Prev  |  Next
Sponsored By:
SoundGuy

S Ontario

Senior Member

Joined: 02/11/2015

View Profile



Posted: 02/08/18 12:28pm Link  |  Quote  |  Print  |  Notify Moderator

lawrosa wrote:

Are there any single 12 volters that are true deep cycle that will fit in the space of two 24's?


I wouldn't get too hung up on what forum pundits define as "true" deep cycle - even Trojan Battery refers to their RV/Marine series as "deep cycle", including their infamous T-105. As to size, sure there are 12 volts with a foot print no bigger than a pair of GC-2s like the T-105 which is 10.3" long or ~ 21" for a pair. If you've got the height a Trojan J185H-AC which is just 15" long would easily fit where a pair of T-105s would fit. Other possibilities may exist in AGM and with other brands - just make sure though you have a means of properly recharging the battery (or batteries) you intend to buy, especially Trojans. [emoticon]

lawrosa

Horry County

Senior Member

Joined: 10/06/2013

View Profile



Posted: 02/08/18 12:38pm Link  |  Quote  |  Print  |  Notify Moderator

SoundGuy wrote:

lawrosa wrote:

Are there any single 12 volters that are true deep cycle that will fit in the space of two 24's?


I wouldn't get too hung up on what forum pundits define as "true" deep cycle - even Trojan Battery refers to their RV/Marine series as "deep cycle", including their infamous T-105. As to size, sure there are 12 volts with a foot print no bigger than a pair of GC-2s like the T-105 which is 10.3" long or ~ 21" for a pair. If you've got the height a Trojan J185H-AC which is just 15" long would easily fit where a pair of T-105s would fit. Other possibilities may exist in AGM and with other brands - just make sure though you have a means of properly recharging the battery (or batteries) you intend to buy, especially Trojans. [emoticon]


123lbs...lol... Who is lifting that??? Im old and weak...Ha ha

http://www.trojanbattery.com/product/j185h-ac/


Mike L ... N.J.

2006 Silverado ext cab long bed. 3:42 rear. LM7 5.3 motor. 300 hp 350 ft lbs torgue @ 4000 rpms
2018 coachmen Catalina sbx 261bh


SoundGuy

S Ontario

Senior Member

Joined: 02/11/2015

View Profile



Posted: 02/08/18 01:18pm Link  |  Quote  |  Print  |  Notify Moderator

lawrosa wrote:

Are there any single 12 volters that are true deep cycle that will fit in the space of two 24's?


SoundGuy wrote:

If you've got the height a Trojan J185H-AC which is just 15" long would easily fit where a pair of T-105s would fit.


lawrosa wrote:

123lbs...lol... Who is lifting that??? Im old and weak...Ha ha


Hey, you asked. [emoticon] Whether one big battery or two smaller ones it takes this kind of weight in total if you want a 220 AH rating at your disposal. [emoticon]

lawrosa

Horry County

Senior Member

Joined: 10/06/2013

View Profile



Posted: 02/09/18 01:43am Link  |  Quote  |  Print  |  Notify Moderator

Good read

http://yarchive.net/car/rv/golf_cart_batteries.html


http://yarchive.net/car/rv/battery_resistance.html

SoundGuy

S Ontario

Senior Member

Joined: 02/11/2015

View Profile



Posted: 02/09/18 10:23am Link  |  Quote  |  Print  |  Notify Moderator



My comments are exactly the same as I posted in your own concurrent thread on this same topic, as follows.



More than a "good read", rather both are great articles from someone who understands much more than the masses here on this forum about the intricacies of deep cycle battery use for RVs, and which is summarized nicely in this statement which I've copied because most won't want to read through either of these links in their entirety. It sums up what a few of us have been trying to explain anytime this subject comes up - why 12 volt jugs in parallel are often the better choice than 6 volt jugs in series for RV use.

"Brian, if you have any large 12 volt loads such as an inverter I predict you will be disappointed with the golf cart batteries. I'll explain.

Two years ago I accepted the advice here in this group without thinking too much about it and replaced my two paralleled group 27 batteries with a pair of golf cart batteries. I immediately noticed several differences. One, anytime I operated a heavy load the voltage sagged MUCH more than it did with the old batteries. My inverter would trip off long before the batteries were discharged because of this. I'm speaking of terminal voltage and not at the other end of a length of wire. I could no longer fast charge them. The internal impedance was so high that they simply would not accept a fast charge without heating. My cordless battery charger could charge the old pair in an hour. It took several hours with the new one. Cranking the genny would drop the voltage so much that the inverter would trip. I got in the habit of hitting the interconnect switch before cranking so that the start battery could do the job.

I did some research like I should have done in the beginning. I learned that golf cart batteries are optimized for long, moderate rate discharges and are NOT designed for heavy loads. This is a mis application. In RVs that don't have heavy loads and don't need to fast charge it is not a problem."


And this has been just my point anytime this discussion comes up - adapting deep cycle 6 volt batteries that were originally designed for moderate, intermittent long term draw in golf carts is not the best choice when one of the main tasks of those batteries in an RV application is to supply power for short duration, heavy load inverter draws. These 2 articles you've linked to are the best I've seen that explains this in terms that are easy to understand, even for the "6 volt or go home crowd". [emoticon]

ktmrfs

Portland, Oregon

Senior Member

Joined: 06/22/2005

View Profile


Offline
Posted: 02/09/18 11:00am Link  |  Quote  |  Print  |  Notify Moderator

SoundGuy wrote:



My comments are exactly the same as I posted in your own concurrent thread on this same topic, as follows.



More than a "good read", rather both are great articles from someone who understands much more than the masses here on this forum about the intricacies of deep cycle battery use for RVs, and which is summarized nicely in this statement which I've copied because most won't want to read through either of these links in their entirety. It sums up what a few of us have been trying to explain anytime this subject comes up - why 12 volt jugs in parallel are often the better choice than 6 volt jugs in series for RV use.

"Brian, if you have any large 12 volt loads such as an inverter I predict you will be disappointed with the golf cart batteries. I'll explain.

Two years ago I accepted the advice here in this group without thinking too much about it and replaced my two paralleled group 27 batteries with a pair of golf cart batteries. I immediately noticed several differences. One, anytime I operated a heavy load the voltage sagged MUCH more than it did with the old batteries. My inverter would trip off long before the batteries were discharged because of this. I'm speaking of terminal voltage and not at the other end of a length of wire. I could no longer fast charge them. The internal impedance was so high that they simply would not accept a fast charge without heating. My cordless battery charger could charge the old pair in an hour. It took several hours with the new one. Cranking the genny would drop the voltage so much that the inverter would trip. I got in the habit of hitting the interconnect switch before cranking so that the start battery could do the job.

I did some research like I should have done in the beginning. I learned that golf cart batteries are optimized for long, moderate rate discharges and are NOT designed for heavy loads. This is a mis application. In RVs that don't have heavy loads and don't need to fast charge it is not a problem."


And this has been just my point anytime this discussion comes up - adapting deep cycle 6 volt batteries that were originally designed for moderate, intermittent long term draw in golf carts is not the best choice when one of the main tasks of those batteries in an RV application is to supply power for short duration, heavy load inverter draws. These 2 articles you've linked to are the best I've seen that explains this in terms that are easy to understand, even for the "6 volt or go home crowd". [emoticon]



agree completely. I've advised many friends to NOT use a GC when they don't dry camp much and like to run microwaves, toaster etc. on the inverter. Each battery type has advantages and disadvantages. I think some people are oblivious to the disadvantage of a GC. At many RV shows, I've talked to Trojan reps about batteries. Just a "what battery should I use" and EVERY time the first question is "do you like to run a microwave, or electric tea pot etc." then followed by some other use questions. In every case they have said if high current draw is important, then use a 12V deep discharge battery NOT a GC.


2011 Keystone Outback 295RE
2004 14' bikehauler with full living quarters
2015.5 Denali 4x4 CC/SB Duramax/Allison
2004.5 Silverado 4x4 CC/SB Duramax/Allison passed on to our Son!


2oldman

Blanding UT

Senior Member

Joined: 04/15/2001

View Profile


Online
Posted: 02/09/18 11:03am Link  |  Quote  |  Print  |  Notify Moderator

SoundGuy wrote:

.. replaced my two paralleled group 27 batteries with a pair of golf cart batteries. I immediately noticed several differences. One, anytime I operated a heavy load the voltage sagged MUCH more than it did with the old batteries.
For heavier draws, 4 or 6 batteries are much better.

SoundGuy

S Ontario

Senior Member

Joined: 02/11/2015

View Profile



Posted: 02/09/18 12:45pm Link  |  Quote  |  Print  |  Notify Moderator

SoundGuy wrote:

.. replaced my two paralleled group 27 batteries with a pair of golf cart batteries. I immediately noticed several differences. One, anytime I operated a heavy lo[emoticon]ad the voltage sagged MUCH more than it did with the old batteries.


2oldman wrote:

For heavier draws, 4 or 6 batteries are much better.


Isn't that self evident? [emoticon] The fact remains that whether one uses six 6 volt GC-2s wired in series / parallel or three 12 volt G31s wired in parallel voltage drop under heavy inverter load will be less with the 12 volts than with the 6 volts. The second fact is that by using GC-2s which were specifically designed for golf cart use one is adapting batteries to RV use ... adapting, not using a battery specifically designed for the task at hand. [emoticon]

Westcoasting

westcoast

Full Member

Joined: 03/25/2012

View Profile


Offline
Posted: 02/09/18 10:07pm Link  |  Quote  |  Print  |  Notify Moderator

SoundGuy wrote:

SoundGuy wrote:

.. replaced my two paralleled group 27 batteries with a pair of golf cart batteries. I immediately noticed several differences. One, anytime I operated a heavy lo[emoticon]ad the voltage sagged MUCH more than it did with the old batteries.


2oldman wrote:

For heavier draws, 4 or 6 batteries are much better.


Isn't that self evident? [emoticon] The fact remains that whether one uses six 6 volt GC-2s wired in series / parallel or three 12 volt G31s wired in parallel voltage drop under heavy inverter load will be less with the 12 volts than with the 6 volts. The second fact is that by using GC-2s which were specifically designed for golf cart use one is adapting batteries to RV use ... adapting, not using a battery specifically designed for the task at hand. [emoticon]


What about dry camping for four days... only battery use is lights at night, and the water pump. Do you think two 12v for this application as well? What do you recommend for the best battery to buy?

Boon Docker

Mountain Foothills of Southern Alberta

Senior Member

Joined: 10/30/2015

View Profile



Posted: 02/09/18 10:14pm Link  |  Quote  |  Print  |  Notify Moderator

^ Two GC-2 (6v) batterys connected in series. Best bet for boon docking (dry camping).

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 10  
Prev  |  Next

Open Roads Forum  >  Travel Trailers  >  General Q&A

 > Two 6 volt batteries or two 12 volt batteries ??
Search:   Advanced Search

Search only in Travel Trailers


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

Adjust text size:

© 2018 CWI, Inc. © 2018 Good Sam Enterprises, LLC. All Rights Reserved. | Terms of Use | PRIVACY POLICY | YOUR PRIVACY RIGHTS