DUAL 6 VOLT BATTERIES

Submitted: Saturday, May 09, 2009 at 09:26
ThreadID: 68658 Views:4721 Replies:6 FollowUps:16
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Hi All,
Why do most people use 2x12volt and not 2x6volt batteries.I do believe the later to be a better set up and give you better battery life.I am using 2x225ah trojans.I was watching a caravan show were a rep from a battery manufacturer said this is the better option as the batteries equalise better and do not have the same problems that 2x12volt hooked in parrellel do(one fails sooner than the other).I have not come across many campers using the 6volt option .WHY
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Reply By: Member - Malcolm (Townsville) - Saturday, May 09, 2009 at 09:41

Saturday, May 09, 2009 at 09:41
2 x 6 volt batteries hooked in series = 12 Volt.

I use this setup with 220 A/Hr batteries.

Malcolm
living the 'good life'

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AnswerID: 363968

Reply By: 3F62 - Saturday, May 09, 2009 at 09:46

Saturday, May 09, 2009 at 09:46
I as well use 2 x 6v 220 amp hr Apollo's.....works well for my use with trailblaza fridge & lights etc.......charge via solar, vehicle or 15amp smart charger.


Cheers
AnswerID: 363970

Follow Up By: travelguy62 - Saturday, May 09, 2009 at 12:29

Saturday, May 09, 2009 at 12:29
Hi 3F62.
What size are your solar panels.
Thanks Guy
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FollowupID: 631663

Follow Up By: 3F62 - Saturday, May 09, 2009 at 19:30

Saturday, May 09, 2009 at 19:30
Single 80 watt BP panel......which is very borderline for my consumption, however it's not fixed and on 8 mtrs of H/duty twin core flex so I move through out the day. In hindsight would have gone with a 120 watt.

Cheers
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FollowupID: 631742

Reply By: RV Powerstream P/L - Saturday, May 09, 2009 at 09:51

Saturday, May 09, 2009 at 09:51
It is rare to get two 12V batteries that are exactly equal and one will normally get to charge before the other with the potential of the weaker battery continaully suffering charge which has the potential to cause premature failure of the battery.

Using two 6 Volt batteries gives you smaller voltage working together to obtain the terminal voltage of 12V and is more efficent and gives you greater capacity.

The parallel syndrome and charging deficiency can now be overcome with the use of the new Pro Split R zero volt drop that takes the alternator power and supplies individual batteries or banks with individual charge and control and safeguards.

To get maximum efficiency it is better to buid to a terminal voltage with smaller voltage batteries than use equal termianl voltage batteries that fight each other for charge.

We use 2V 4V and 6V to build banks to a terminal voltage.

Ian
AnswerID: 363971

Follow Up By: travelguy62 - Saturday, May 09, 2009 at 13:06

Saturday, May 09, 2009 at 13:06
Hi Ian,
Great information,should help a few out to understand battery systems.
Thanks Guy
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FollowupID: 631670

Follow Up By: fisho64 - Sunday, May 10, 2009 at 01:03

Sunday, May 10, 2009 at 01:03
"The parallel syndrome and charging deficiency can now be overcome with the use of the new Pro Split R zero volt drop that takes the alternator power and supplies individual batteries or banks with individual charge and control and safeguards."

so why cant you do that with 12 volt batteries then?

I dont see why using 6 volt batteries has ANY advantage over 612 volt? all the arguments and solutions apply to both?
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FollowupID: 631777

Follow Up By: travelguy62 - Sunday, May 10, 2009 at 06:50

Sunday, May 10, 2009 at 06:50
Hi Fisho64,
The Pro Split R zero is for 12volt batteries.If you read what Ian has written above.It is very difficult to get perfectly identical batteries,so one is always stronger that the other and slowly robbs the other while charging and the weaker battery will die eventually.The Pro Split R zero charges the batteries(12v) indivdually to compensate for this problem.Hope this helps you.
Cheers Guy
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FollowupID: 631782

Follow Up By: RV Powerstream P/L - Sunday, May 10, 2009 at 07:50

Sunday, May 10, 2009 at 07:50
Fisho6
The Marine electrical scenario is way ahead of the land electrical scenario out of necessity and good quality Marine charging is done by splitting up the batteries as much as possible to charge them and that is achieved with mutiple bank charging systems .

ProMariner for instance is a major OEM supplier to the boat building industry in USA and all their dru mount chargers and sport fishing chargers are mutiple bank chargers even the 10A in 2 bank.

The largest is a twin 60A on a frame that gives 120A with 6 banks which can be used for twin engine crankers a house bank and a bow thruster.

The ProSplitR is doing the same with multipe banks but using the alternator to supply the power.

The picture used as a logo is actually a two bank ProSplit R and they come in both 12V and 24V in various amp and bank capacity even 2 alternator 4 bank.

Ian

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FollowupID: 631788

Follow Up By: travelguy62 - Sunday, May 10, 2009 at 13:09

Sunday, May 10, 2009 at 13:09
Hi Ian,
Have you had much to do with the Pro Split R zero.Are they readily available and are they exspensive.Do these units work with solar panels or are they not needed in this situation.
Thanks Guy
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FollowupID: 631831

Follow Up By: RV Powerstream P/L - Sunday, May 10, 2009 at 15:07

Sunday, May 10, 2009 at 15:07
Guy
If you contact me by email I will send you a brochure on them.
The brochure states they are A solution for all applications mso that does not exclude solar.
info@powerstream.com.au
Ian
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FollowupID: 631852

Reply By: Member - Allan B (QLD) - Saturday, May 09, 2009 at 10:47

Saturday, May 09, 2009 at 10:47
Hang on ..... am I missing something here?

Every lead acid battery is comprised of 2 volt cells connected in series (usually by the manufacturer). 3 cells for a 6 volt battery, 6 cells for a 12 volt battery etc.

So what is the difference between a 12v battery of 6 cells and a pair if 6v batteries of 6 cells. Both are 12 volts, charged together by a 12v alternator and consumed together by 12v loads. Put either arrangement inside a cardboard box out of sight and you could not detect an electrical difference.

So how do you connect these two 6 volt batteries to provide segregated 12v sources for cranking and auxiliary power? And if separated, how do you charge them from a 12 volt alternator source.

I really am confused. Please fill me in.

Cheers
Allan

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AnswerID: 363981

Follow Up By: Member - Allan B (QLD) - Saturday, May 09, 2009 at 11:52

Saturday, May 09, 2009 at 11:52
Aha, I think I spot it!

I think you are referring to the battery bank in the camper or caravan, with no reference to the cranking battery in the vehicle.

I guess that you are striving for a larger ampere hour capacity than can be conveniently obtained from just one 12v battery. Now that makes sense.

Anyway, cannot wait for an answer...... wifey is finally ready to leave on our trek, so I'm shutting down. See yo'all in a few weeks.

Cheers
Allan

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FollowupID: 631655

Follow Up By: RV Powerstream P/L - Saturday, May 09, 2009 at 12:10

Saturday, May 09, 2009 at 12:10
Allan A valid question and all batteries comprise 2 Volt cells and each cells builds to a terminal voltage.

A 6Volt has three cells so to build to 6V terminal voltage and 2 batteries in series builds continuously to 12V terminal voltage.
2-4-6-8-10-12 One Bank.

A 12v has 6 cells and 6 cells builds continuously to 12V so 2 batteries in series would build continuous to 24V.
2-4-6-8-10-12-14-16-18-20-22-24.One Bank.

Two by 12V in parallel has 6 cells per battery building to a terminal volt oif 12 Volt and 2x 12V batteries will fight each other for the charge as they are rarely equal and one invariably wins.
2-4-6-8-10-12 Plus 2-4-6-8-10-12 Two Banks.
Ian
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FollowupID: 631656

Follow Up By: travelguy62 - Saturday, May 09, 2009 at 12:26

Saturday, May 09, 2009 at 12:26
Gidday Allen,
I am going to be using this set up in my camper(still in progress)and charging them through a 30amp 3 stage controller and 2x75watt panels mounted on the top.I also have CTEK 25amp charger as a back up.I am not charging the batteries from the vehicle while travelling.I think my system should be self sufficiant as I am only running a 60ltr fridge and some lighting.
Guy
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FollowupID: 631660

Reply By: Boobook2 - Saturday, May 09, 2009 at 15:01

Saturday, May 09, 2009 at 15:01
2 x 6V batteries would normally be better in a fixed environment where you can easily get repalcement batteries. However in Recreational / trailer applications if one battery fails and you are miles from anywhere then you have no 12v at all. If you have 2 x 12V batteries then you have redundancy built in and have half capacity left.

Also I have found that 12v batteries will be 10 - 30 % cheaper for the same watt - hour capacity.

AnswerID: 364011

Follow Up By: travelguy62 - Saturday, May 09, 2009 at 17:13

Saturday, May 09, 2009 at 17:13
Hi Boobook2,
Thats a good point,hopefully through regular maintanance this wont be an issue and a battery cell collapsing is a unlucky thing to have happen.I dont think getting a 6volt golf cart battery is too hard these days.I found if you shop around they are cheaper than the 12volt agm,s.
Thanks Guy
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FollowupID: 631705

Follow Up By: RV Powerstream P/L - Sunday, May 10, 2009 at 07:57

Sunday, May 10, 2009 at 07:57
Anywhere there is a golf course there would be someone that supplies 5V golf buggy batteries.

Cell failure can be a problem with batteries where the bottom of the plates are not lock bonded for vibration.

All Battery Energy RV gel and Marine Gel batteries are based on high vibration European Standards.
Ian
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FollowupID: 631789

Follow Up By: RV Powerstream P/L - Sunday, May 10, 2009 at 09:23

Sunday, May 10, 2009 at 09:23
I should have put my glasses on 5V should be 6V.
Why are the keys so close together.
ian
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FollowupID: 631799

Follow Up By: Boobook2 - Sunday, May 10, 2009 at 09:58

Sunday, May 10, 2009 at 09:58
I guess that is the point. I would rather keep going with half battery capacity and perhaps get any new battery at the next servo if necessary than have no power and look for a golf course and buggy supply shop. There ain't a lot of golf courses in remote locations. I can't imagine electric carts at ones that were there.

I still stand by 12v being generally cheaper in same brand for the same 12v of AH capacity for all 3 suppliers I looked at in detail.

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FollowupID: 631802

Follow Up By: RV Powerstream P/L - Sunday, May 10, 2009 at 11:20

Sunday, May 10, 2009 at 11:20
BooBook2

Yes you have a point there where vehicles are 12V and small capacity.

So that means to get greater capacity and longer life charging batteries by individual means may be the way to go.

The other way is most vehicles have twin batteries and if the camper has problems it can be powered from the second vehicle battery with smart charging.

It all boils down to what can a person afford and are they happy with what they have.

Ian
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FollowupID: 631817

Reply By: Wahroonga Farm - Thursday, May 14, 2009 at 18:52

Thursday, May 14, 2009 at 18:52
"It all boils down to what can a person afford and are they happy with what they have.

Ian"

And that's the real answer. :)
AnswerID: 364884

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