Good Sam Club Open Roads Forum: Tech Issues: 12v to 6v review?
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

 > 12v to 6v review?

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 8  
Prev  |  Next
Vintage465

Prunedale CA.

Senior Member

Joined: 05/02/2015

View Profile


Offline
Posted: 05/04/21 05:09pm Link  |  Quote  |  Print  |  Notify Moderator

ktmrfs wrote:

JimK-NY wrote:

Vintage465 wrote:




Yup that is true you would have only 235ah in a two 6-sixer set up. But you'd only have 200ah in two-12er set up and they both have the same "safe draw down to 50%". The weight is about the same, the sixers being about 2 pounds heavier. The 12's will take up more space as their foot print is a little larger.
......


I found 2 batteries that compared closely for AH ratings. The first was a 6 v Duracell @235/2=117 and the second was an Apex 12 v with 115 AH. Two of each would be comparable. The weight for each was identical @ 68#. The 6 v took 794 cu in of space and the 12 v tool less at 729 cu in. The biggest difference is in height of the batteries. Typically 6 volt batteries are higher, in this case by almost 3". My battery box will not accommodate the extra height so for me there is no choice but to stick with a pair of 12v batteries. At least I found a pair totally 300 AH that will just fit.


the height increase with GC2 is an issue with a fair number of applications. And couple that with few vented boxes for GC2 use in 5th wheels.

However for tongue storage there are many nice boxes made for two GC2's either end to end or side to side configuration if you have enough clearance to get to batteries in. But that assumes the TT battery location on the tongue has enough height, and on many new trailers that can be an issue.


In my case,(and everyone's situation is different)the height is not nearly as much an issue as is the foot print. It would be nearly impossible to get the amount amp/hour with 12v batteries and get them where my 6's are.


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!

MEXICOWANDERER

las peñas, michoacan, mexico

Senior Member

Joined: 06/01/2007

View Profile


Offline
Posted: 05/04/21 07:06pm Link  |  Quote  |  Print  |  Notify Moderator

If automotive batteries were sufficient, golf cars, electric forklifts and submarines would have been powered by car batteries.

I'll repeat it. A group 27 battery was fitted with GC220 plates. It had 220 CCA and died from acid starvation. Designer: Me. Vendor ABC BATTERY Los Angeles.

wopachop

Who run bartertown

Senior Member

Joined: 11/17/2006

View Profile


Offline
Posted: 05/06/21 08:38am Link  |  Quote  |  Print  |  Notify Moderator

SabreCanuck wrote:

Currently have 2-12v 7ear old batteries that appear to be getting weak. Am thinking of replacing with 2-6v GC batteries (or maybe 4).
Anyone have experience or real world review of moving to the 6’s?
Where do you camp? I didnt read the 4 pages sorry if answered.

mr_andyj

Georgia

Senior Member

Joined: 11/13/2004

View Profile



Posted: 05/07/21 08:19am Link  |  Quote  |  Print  |  Notify Moderator

MEXICOWANDERER wrote:

If automotive batteries were sufficient, golf cars, electric forklifts and submarines would have been powered by car batteries.

I'll repeat it. A group 27 battery was fitted with GC220 plates. It had 220 CCA and died from acid starvation. Designer: Me. Vendor ABC BATTERY Los Angeles.

and remember when it's too hot to park in the sun, roof top solar panels are useless.

Ummm, umm, I'll repeat, ummm.. You lost me there. Too hot? I don't think so, solar works in the sun. And, the battery "you" designed failed? That tells me more than I need to know...

Boon Docker

Mountain Foothills of Southern Alberta

Senior Member

Joined: 10/30/2015

View Profile



Posted: 05/07/21 02:57pm Link  |  Quote  |  Print  |  Notify Moderator

mr_andyj wrote:

MEXICOWANDERER wrote:

If automotive batteries were sufficient, golf cars, electric forklifts and submarines would have been powered by car batteries.

I'll repeat it. A group 27 battery was fitted with GC220 plates. It had 220 CCA and died from acid starvation. Designer: Me. Vendor ABC BATTERY Los Angeles.

and remember when it's too hot to park in the sun, roof top solar panels are useless.

Ummm, umm, I'll repeat, ummm.. You lost me there. Too hot? I don't think so, solar works in the sun. And, the battery "you" designed failed? That tells me more than I need to know...


Let me help you out here.

Quote: "when it's too hot to park in the sun, roof top solar panels are useless"

[emoticon]

JimK-NY

NY

Senior Member

Joined: 05/12/2010

View Profile



Good Sam RV Club Member

Offline
Posted: 05/07/21 04:00pm Link  |  Quote  |  Print  |  Notify Moderator

When it is too hot to park in the sun, then it is time to move on.

MEXICOWANDERER

las peñas, michoacan, mexico

Senior Member

Joined: 06/01/2007

View Profile


Offline
Posted: 05/07/21 04:18pm Link  |  Quote  |  Print  |  Notify Moderator

OK I'll lower the bridge to fit the ship...

When it's too hot to park in the sun, it means for you. The panels can care less. Of course someone *could* insist on 135 degrees inside just because the batteries wouldn't charge if he didn't. This is referred to as prettyfartsmeller planning.

There is zero comparison between golf car battery construction and automotive battery with rope handles and weird terminals construction. I attempted to describe exactly why this is true. But once again the bridge seemingly was too high for the boat? Pull all the books on celestial mechanics and phasor algebra off the shelf?

I am a Battery Council International certified design engineer the last I checked. That should satisfy any "you designed" questions. Membership in the BCI is expensive. So I let it lapse. It wasn't paying me a nickel.

One member posted there was "no proof" that there was a difference between golf car and automotive battery lifespan. There is a pregnant pause after that statement.

mr_andyj

Georgia

Senior Member

Joined: 11/13/2004

View Profile



Posted: 07/26/21 06:48pm Link  |  Quote  |  Print  |  Notify Moderator

Mexicowanderer, im not sure you are writing whet you mean and getting your point across. Hot under the sun?
I dont think anyone here, I hope not, would ever consider using an automotive battery, this is pure nonsense, that has not even been discussed in this thread that I recall.

I think the general consensus is that 6 volt batteries are better for RV use simply because they have thicker plates. If the 12s had thicker plates then we would not be discussing. Most will buy batteries at an automotive shop or walmark where they are easy to get and easy to warranty and easy to find exact replacements for, so we are mostly discussing flooded lead acid batteries. The differences being the 12s are Marine and the 6s are Golf cart; compromise batteries vs a true deep cycle batt.
the 12s have to be paired with same age/same voltage SOC while the 6s don't care.

Yes, for large, high current, high amp draws the automotive battery will deliver, once or twice, the Marine batt will do pretty good as it is able to surge more amps to high draw appliances, but not take as many discharge/recharge cycles at a true deep cycle batt,
BUT overall for most RVers the true deep cycle (the 6s) will give the longest life and the best preformance for most RV needs.

MEXICOWANDERER

las peñas, michoacan, mexico

Senior Member

Joined: 06/01/2007

View Profile


Offline
Posted: 07/26/21 09:25pm Link  |  Quote  |  Print  |  Notify Moderator

There are a lot more differences than mere thicker plates. I have related the story of the ABC 6 cell battery built with .080" plates. 40 amp hours and instant acid starvation. It's cycle life was measured in days.

Or a customer in a bus with one of the first Trace Engineering 2524 SB inverters purchased solely for his microwave oven. I set him up with four group 31 Delco calcium/Calcium 1100 CCA batteries. The longest cycle was 3 minutes. I lost track of the man from La Mesa 5 years later with the batteries still going strong.
Beyond GC batteries the 6 cell scrubber batteries have even thicker plates the same as L16s, then 2 volt cells. My military built Rolls batteries have .300" plates but I had to parallel them for a total of 24 batteries in order to get enough CCA for a Trace 4024 inverter. It had to start a 7½ HP well pump under head pressure.
Auditing and engineering is the key. Find the best fit then stick with it.
But keep in mind a six hundred dollar drum of plate paste cannot equal a twenty seven hundred dollar drum of plate paste. And a .30 cent separator is not an eighty cent separator. Virgin lead is far superior to reclaimed lead but twice as expensive.
So pointing toward a YUGO then a RR Phantom and stating "same" because they have 4 wheels and a motor, is foolish.

time2roll

Southern California

Senior Member

Joined: 03/21/2005

View Profile



Good Sam RV Club Member


Posted: 07/26/21 10:13pm Link  |  Quote  |  Print  |  Notify Moderator

Boon Docker wrote:

Let me help you out here.

Quote: "when it's too hot to park in the sun, roof top solar panels are useless"

[emoticon]
If the roof is getting sun.... you don't have enough solar panels.


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

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 8  
Prev  |  Next

Open Roads Forum  >  Tech Issues

 > 12v to 6v review?
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.