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Old 09-10-2019, 07:26 AM   #1
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17B Batteries: Why?

Just curious, why do the 17 trailers have two 6v batteries rather than 12v, and why are they on the rear bumper? I can understand lack of interior room, but can they not adversely affect weight and balance? Did it allow ETI to move other heavy items forward?

When I need new batteries I would consider two 12v in parallel, but expect the charging/solar systems would not be compatible?
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Old 09-10-2019, 07:40 AM   #2
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The two batteries on the rear are an option. Stock is a single 12 volt. They are on the rear bumper because that is where they fit and you are correct, they provide balance fore and aft. The dual six volt batteries, in my mind, are far superior to the single or dual 12 volt system. Especially if you do go off grid, travel fall/spring, do not have solar or are a heavy user of power. Properly configured batteries in parallel or serial do not require any changes to the charging/solar system. All three options of batteries results in 12 volts, it matters not how the 12 volts are arrived at.
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Old 09-10-2019, 09:20 AM   #3
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Sure makes battery maintenance and replacement easy having them on the bumper!
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Old 09-10-2019, 09:47 AM   #4
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and theft as well as exposed to the elements.....
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Old 09-10-2019, 12:10 PM   #5
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Quote:
Originally Posted by flynfrfun View Post
Sure makes battery maintenance and replacement easy having them on the bumper!
...and no nuisance alarms on the propane/CO detector from the off gassing
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Old 09-10-2019, 12:35 PM   #6
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Did it allow ETI to move other heavy items forward?
Not quite - the proportions of the 17' have the axle further rearward in the trailer than typical, so it would tend to be excessively front-heavy with the battery in the front. It is proportioned much like the Casita 17', which is notorious (as discussed in the FiberglassRV forum) for having very high tongue weight for its size, especially compared to the Scamp and Casita 16' models. Reace derived the 17' design from the 15' Surfside by adding all of the length ahead of the axle, and placed the battery in the rear to avoid excessive tongue weight.
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Old 09-10-2019, 12:38 PM   #7
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Series versus parallel

Quote:
Originally Posted by marant View Post
When I need new batteries I would consider two 12v in parallel, but expect the charging/solar systems would not be compatible?
As Paul explained, it wouldn't matter to the charging systems (converter or solar system) whether the nominally 12 volt battery bank is two 6 V batteries in series, two 12 V batteries in parallel, one big 12 V battery, or any of the other possible configurations. Three 4 V in series, anyone?

Why would you consider two 12 V batteries in parallel instead of two 6 V batteries in series? There are valid reasons to do that, such as the ability to run on one if the other fails; however, there are also reasons to avoid it, such as imbalance between the batteries and the greater availability of suitable batteries in the 6 V format.
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Old 09-10-2019, 03:37 PM   #8
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I read this a few years ago, good read.

The 12volt Side of Life (Part 1)

The battery was moved to the back bumper for proper tounge weight. The first 17B was to heavy at the hitch.
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Old 09-10-2019, 03:51 PM   #9
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Quote:
Originally Posted by fudge_brownie View Post
The dual six volt batteries, in my mind, are far superior to the single or dual 12 volt system. Especially if you do go off grid, travel fall/spring, do not have solar or are a heavy user of power. Properly configured batteries in parallel or serial do not require any changes to the charging/solar system. All three options of batteries results in 12 volts, it matters not how the 12 volts are arrived at.

I don't understand this dislike for dual 12 volt batteries. With my setup I can use them individually or parallel.


I have more storage capacity than dual 6 volt. I can remove one and charge it when exploring the local area in my tow vehicle. If one goes bad I simply switch to the remaining one and happily carry on till I can buy a replacement. I honestly do not see any downsides to dual 12's if you set them up right.


Quote:
Originally Posted by Brian B-P View Post
Why would you consider two 12 V batteries in parallel instead of two 6 V batteries in series? There are valid reasons to do that, such as the ability to run on one if the other fails; however, there are also reasons to avoid it, such as imbalance between the batteries and the greater availability of suitable batteries in the 6 V format.
An imbalance between the batteries should only be a problem if one is extremely depleted and you are running them in parallel. Or if you are charging them in parallel (which I never do) but the same could be said for dual 6's.
And as far as the "greater availability of suitable batteries in the 6 V format" could you please explain that for me because that has not been my experience. 12 volt deep cycle batteries are easy to get, from Costco to Canadian Tire to any RV shop.
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Old 09-10-2019, 04:01 PM   #10
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Quote:
Originally Posted by flynfrfun View Post
Sure makes battery maintenance and replacement easy having them on the bumper!

You got that right


Quote:
Originally Posted by cpaharley2008 View Post
and theft as well as exposed to the elements.....

If theft worries you battery locks are not hard to find or make your own if you prefer. And after 4 1/2 years of sitting on my bumper in a battery case protected from the elements, mine are doing just fine, thank you very much.
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