6 volt deep cycle batts

Submitted: Tuesday, Feb 14, 2006 at 23:02
ThreadID: 30792 Views:2652 Replies:7 FollowUps:5
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Was at a campervan / motorhome fitout place today and they commented that all that is used in the industry today are 6 volt batts. Link 2 to get the 12volts obviously. Didn't say why they are better.

Some of these gel batts were 220amp each!

Simple question: Other than space limitations, why do most people in the 4wding / camper trailer industry use 12volt batts if 6 volts are supposedly superior?
John
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Reply By: Trevor R (QLD) - Tuesday, Feb 14, 2006 at 23:10

Tuesday, Feb 14, 2006 at 23:10
Hi John,

I don't know either, the 2 6 volt 220amphr batts I have in my van have worked a treat for at least 4 and a bit yrs. They are only just now starting to fade, but I think that's because I don't use them as much as I used to.
Only downside to this is their weight (56 or 58kgs) in total.

Cheers Trevor.

PS Comet battries used to have the best prices in our area if you want to go further with the idea.
AnswerID: 155043

Follow Up By: Member - Ozdyssey (QLD) - Tuesday, Feb 14, 2006 at 23:15

Tuesday, Feb 14, 2006 at 23:15
Bloody hell just the weight might pull me up.
Thks Trevor
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Reply By: Topcat (WA) - Wednesday, Feb 15, 2006 at 00:11

Wednesday, Feb 15, 2006 at 00:11
The 2 - 6volt deep-cycle batteries connected in series is all I have ever used in my set-up, mainly because of the capacity a 6volt battery will give you. Battery size - N70Z for 200amp capacity. Cheers.
AnswerID: 155057

Reply By: Peter H - Wednesday, Feb 15, 2006 at 09:29

Wednesday, Feb 15, 2006 at 09:29
6 volt batteries are not the only ones used these days, particular installers may use or recommend them, others use and recommend 12 volt batteries. The reason 12 volt are used al lot is due to availability, space and wiring and only one battery is needed, hence mounting and wiring may or may not be easier to achieve.

If an installation is set up with 6 volt batteries and one fails, then availability, depending on where you are comes into play. If it was a 12 volt, then any 12 volt will get you going until you can get the exact make/type of battery you want. Also fitment of 2 x 6 volt batteries next to each other is not always possible so 12 volt is used.

2 x 6 volt 100 A/Hr batteries in series is the same as 1 x 12 volt 100A/Hr battery

2 x 6 volt 200 A/Hr batteries in series is the same as 2 x 12volt 100A/Hr batteries in parallel

Sometimes the size and shape of 6 volt batteries may have an advantage for installation purposes, sometimes not.
There are a lot of AGM(absorbed glass mat) batteries out there in different shapes and sizes, all depends on what you want. Personally I prefer AGM batteries to GEL.
AnswerID: 155101

Follow Up By: Member - Ozdyssey (QLD) - Wednesday, Feb 15, 2006 at 13:20

Wednesday, Feb 15, 2006 at 13:20
Cheers Peter
that clears things up a bit

-why do you personally prefer AGM's over Gel?

John
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Reply By: Member - Collyn R (WA) - Wednesday, Feb 15, 2006 at 11:52

Wednesday, Feb 15, 2006 at 11:52
The amount of energy a battery can store is not related in any way to voltage, but more to the mass of lead and electrolyte it contains.

A six-volt 200 Ah battery theoretically stores 1200 watts. A 12-volt 100 Ah battery also stores 1200 watts.

Two six-volt 200 Ah batteries in series produce 12-volts at 200 Ah. Still 2400 watts.

Two 12-volt 100 Ah batteries in parallel produce 12-volts at 200 amps. Still 2400 watts!

In every case the weight will be about 40-50 kg.

There are various arguments for and against both methods of connection. Most are academic - in practice the pros and cons cancel out.

Fit whatever is most convenient!
Collyn Rivers
AnswerID: 155121

Follow Up By: P.G. (Tas) - Wednesday, Feb 15, 2006 at 14:10

Wednesday, Feb 15, 2006 at 14:10
G'day Collyn, I'm no expert, but I was under the impression that;

Two 6 volt 200ah batteries wired in parralel (+ to+) would produce 400ah@6 volts, 2400watts.

Two 6 volt 200ah batteries wired in series (- of first batt to + of second batt) would produce 400ah@12 volts, 4800watts.

Least that what we were taught at school, maybe some electrical engineer can clear this one up. I think you are right about the weight though, 6 volt 200ah batteries are HEAVY!

Cheers
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FollowupID: 409091

Follow Up By: techie - Thursday, Feb 16, 2006 at 01:41

Thursday, Feb 16, 2006 at 01:41
P.G.
second half is wrong
should read
Two 6 volt 200ah batteries wired in series (- of first batt to + of second batt) would produce 200ah@12 volts, 2400watts.
Double voltage, same current
Techie
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Reply By: Member - Ozdyssey (QLD) - Wednesday, Feb 15, 2006 at 13:21

Wednesday, Feb 15, 2006 at 13:21
Ah ha!....... as they say

Thks Collyn
AnswerID: 155142

Reply By: Rigor - Wednesday, Feb 15, 2006 at 15:48

Wednesday, Feb 15, 2006 at 15:48
To P.G.
parrallel batteries ups the capacity at the same voltage
Series batteries ups the voltage at the same capacity as 1 battery

your analogy above was incorrect , 2 X 200amp batts in series is still 200 amps but 12 volts

Dave L
AnswerID: 155161

Reply By: Member - Collyn R (WA) - Wednesday, Feb 15, 2006 at 18:55

Wednesday, Feb 15, 2006 at 18:55
PG

I fear watt they taught you at school was wrong!

(Incidentally I was a research engineer. Electronics and electrical engineer were a couple of the things we had to know about).
Collyn Rivers
AnswerID: 155186

Follow Up By: P.G. (Tas) - Wednesday, Feb 15, 2006 at 20:41

Wednesday, Feb 15, 2006 at 20:41
My apologies folks, I stand corrected.

Cheers
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FollowupID: 409164

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