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Old 09-19-2016, 05:11 PM   #1
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6volt vs 12volt

Which is battery configuration is better and why, 2 X 12Votls is parallel or 2 X 6volts in series?
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Old 09-19-2016, 05:28 PM   #2
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I prefer twp six volt in series. A touch more amps and true deep cell batteries.

For a bit better of an explanation - https://youtu.be/tGNMenyNqwU
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Old 09-19-2016, 06:26 PM   #3
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Electric golf carts have been using 6 volt batteries for ever.

They depend on them lasting a long time with hard use.

That's good enough for me.
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Old 09-19-2016, 06:28 PM   #4
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Originally Posted by twinboat View Post
Electric golf carts have been using 6 volt batteries for ever.

They depend on them lasting a long time with hard use.

That's good enough for me.
Plus they are plentiful which makes them easy to find and cheaper. I have 4 8D 12 volt batteries, the cheapest price on LifeLine AGM's I can find is $500 EACH. And I have to have them shipped in from Texas to get that price.
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Old 09-19-2016, 07:56 PM   #5
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It's all about how many amp-hours you can get in the space available and for how much you want to spend. The other consideration is that the batteries should be true deep cycle.
Most "marine deep cycle" 12 volt batteries are not a true deep cycle but rather a hybrid between a starting and deep cycle. They will not last as long when used as a house battery as that of a true deep cycle. True deep cycle 12 volt batteries are available but are typically more expensive per amp-hr than two 6 volt.
Have I confused you yet?
Most of the time you are better off using sets of two 6 volt batteries. Example: four 6 volt series-parellel will give you more amp-hrs than two 12 volt in parellel for the same price.
Now as far as which 6 volt deep cycle batteries to us is anothe discussion.
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Old 09-19-2016, 09:13 PM   #6
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The first questions should be: how much dry-camping will you do in one streak?
If you seldom dry-camp go with 12V batteries and you don't have to spend a lot of money having cables fabricated for multiple 6V batteries, Which BTW each weighs as much as a 12V battery, you already have the needed cables.
I have 3-12V house batteries, they performed well when we dry-camped at the Navy base in Key West for 3 weeks. I ran the genset for 2 hrs. every evening to re-charge small electronics, house batteries, watch TV, cook dinner, etc.
Used the inverter to make coffee each morning, run microwave to re-heat breakfast made the previous evening; ran roof fans all day from battery power.
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Old 09-24-2016, 01:23 PM   #7
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I have four size 30, 12 volt AGM coach batteries backed up by 300 watts of solar charging. I run the generator occasionally only to power microwave and toaster. We sometimes watch a 22" TV all day long and never run out of power. I purchased the batteries on sale from Cabela's for under $200 each. If one of my batteries fails, I can jumper it out in a matter of minutes and still have adequate power with three good batteries. I have seen one of two 6 volt batteries fail and the coach is out of power. I really do not understand why I have never heard anyone discuss this as an issue.
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Old 09-25-2016, 08:40 AM   #8
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In our 2004 Vectra, we had two 6-volt Trojan T-105's that were original to the coach! Replaced them with four, and the dealer supplied the short cables to connect, and threw in one of those 'handles' to lift them. 630 bucks total, not cheap, but well worth it. And, we haven't even boondocked once. But, it is in our future plans.
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Old 09-25-2016, 08:51 AM   #9
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When I looked at the 2017 model Canyon Star, I noticed they used two 12 volt batteries, and mounted them behind the hood and slightly lower than the chassis battery. I have long thought the six volt batteries were better, but it seems Newmar thinks otherwise. I still find the mounting location strange.
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Old 09-25-2016, 08:59 AM   #10
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When I looked at the 2017 model Canyon Star, I noticed they used two 12 volt batteries, and mounted them behind the hood and slightly lower than the chassis battery. I have long thought the six volt batteries were better, but it seems Newmar thinks otherwise. I still find the mounting location strange.
Newmar can think that if they want. Most owners won't have any issue until the warranty is all gone.
Newmar probably supplies some coaches with single, ergo they have those in stock. As they are not true deep cycle, they are probably 1$ cheaper than a GC2. And, you get the added value of less capacity. Lead/acid batteries do not play nicely when in parallel. You will not be able to get AH*2. You might get 1.75, but don't count on much better than 1.5.
Plus, with 2ea 6V jars in parallel, there is very little likelihood of a battery explosion. My little brother did boat work before the depression and always has stories of the money he made on those cleanups....
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Old 09-25-2016, 10:00 AM   #11
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Originally Posted by B Dubya View Post
When I looked at the 2017 model Canyon Star, I noticed they used two 12 volt batteries, and mounted them behind the hood and slightly lower than the chassis battery. I have long thought the six volt batteries were better, but it seems Newmar thinks otherwise. I still find the mounting location strange.
Our Bay Star also has the batteries under hood as you describe. I am quite happy with this location, much easier access than under the steps IMHO. It's handy to have all three batteries in the same location for servicing.
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Old 09-25-2016, 10:24 AM   #12
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Why is it we always get onto a diatribe on what I have verses what the OP asked. He said TWO batteries, not 6 with solar or whatever.
For most either 6 or 12 volt will work, having two batteries if one 6 volt goes out you are dead, with two 12volts you are inhibited but not dead. Just because golf carts run 6 volt does not make them better, grandpa carved his teeth so you should too. Now let's all sit on our yoga mat and chant 6 volt, 6 volt, 6 volt, 12 volt DEEP CYCLE are here and it many cases are better for some people's needs. Cost wise 12 volts are a bit higher, but in my case I can put two of the Trogan 12 volts true deep cycle in and have a touch more amp hours.

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Old 09-25-2016, 10:43 AM   #13
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Originally Posted by hfbundy View Post
I have seen one of two 6 volt batteries fail and the coach is out of power. I really do not understand why I have never heard anyone discuss this as an issue.
It has been, you must have missed it but most people didn't seem to have a concern so it kind of went away.
I have 4 - 8D 12 V batteries and space for two more which I may add now that I'm removing the only propane (two burner cooktop) and replacing it with an induction unit.
Already have 400 watts solar so I'm not sure I need an add'l 200 amp hours (50% draw down), guess I'll find out.
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Old 09-26-2016, 03:49 PM   #14
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Originally Posted by wdweldon View Post
Which is battery configuration is better and why, 2 X 12Votls is parallel or 2 X 6volts in series?
12 volt deep cycle batteries are worthless. Just believe experience count over all other discussion. See my blog. 6 volt deep cycle is the best experience ever as well as a progressive battery charging ckt.

If you don't want to believe then buy the 12 v dc "deep cycle" then you will be a believer in the 6 volt.

Nuff said - this has been going on for 20 years.
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