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Old 04-01-2012, 10:42 AM   #1
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Evergreen , Colorado
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Moving to Lifeline AGMs - but tongue weight is an issue

So I'm finally going to bite the bullet and switch out my current crappy deep cycles for AGMs. I have two options. Option 1: Slightly increase the height of the battery box to accomodate 2 6 volt Lifeline GP4 CTs. Weight will be slightly increased on the tongue over my interstate group 24's. If anything I would like to decrease the weight on the tongue, as I am towing my 23D international with a touareg. It works fine now, but I wouldn't want to add much weight to the tongue.

Option 2: Pull the interstates, and install a GPL 8DA farther back in the cabin, under the sofa most likely where the weight would rest more on the wheels. This area is not vented, and I would need to run some beefy cables up to the connection points in the battery box on the tongue. The nice thing about this setup is I would have more amp hours, a battery that would stay warmer inside, and I would lighten the tongue weight. Downside is concern over the venting even with AGM's, and I only have one battery. Still, if one battery went bad in the 6 volt option I would have no power as well.

If I really wanted to go nuts with option 2, I could buy a second 8DA and throw it in the back of my Touareg in the future and hook them up in parallel. A lot easier than adding 2 more 6 volts...

Thoughts? What would you do?
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Old 04-01-2012, 10:55 AM   #2
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How does it work with your weight scale values? That is, is there room to adjust the WDH a bit more? It is not a direct correlation from an extra 60# of battery weight to an additional 60# of TW. At all. The further from the coupler ball center, the less, IOW.

I do know that I'd rather not move the battery around. Sooner or later they get dropped or themselves damage something else just due to mass & weight.
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Old 04-01-2012, 11:01 AM   #3
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Quote:
Originally Posted by Nightwatch View Post
So I'm finally going to bite the bullet and switch out my current crappy deep cycles for AGMs. I have two options. Option 1: Slightly increase the height of the battery box to accomodate 2 6 volt Lifeline GP4 CTs. Weight will be slightly increased on the tongue over my interstate group 24's. If anything I would like to decrease the weight on the tongue, as I am towing my 23D international with a touareg. It works fine now, but I wouldn't want to add much weight to the tongue.

Option 2: Pull the interstates, and install a GPL 8DA farther back in the cabin, under the sofa most likely where the weight would rest more on the wheels. This area is not vented, and I would need to run some beefy cables up to the connection points in the battery box on the tongue. The nice thing about this setup is I would have more amp hours, a battery that would stay warmer inside, and I would lighten the tongue weight. Downside is concern over the venting even with AGM's, and I only have one battery. Still, if one battery went bad in the 6 volt option I would have no power as well.

If I really wanted to go nuts with option 2, I could buy a second 8DA and throw it in the back of my Touareg in the future and hook them up in parallel. A lot easier than adding 2 more 6 volts...

Thoughts? What would you do?
Keep in mind that with the 6 volt batteries, when one dies they are both gone, as far as supplying any more power.

With 2 12 volt batteries, in parallel, the opposite is true.

Basically, the 2 6's have no advantage over the 2 12's, but indeed do have disadvantages.

Andy
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Old 04-01-2012, 11:24 AM   #4
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Originally Posted by Inland RV Center, In View Post
Keep in mind that with the 6 volt batteries, when one dies they are both gone, as far as supplying any more power.

With 2 12 volt batteries, in parallel, the opposite is true.

Basically, the 2 6's have no advantage over the 2 12's, but indeed do have disadvantages.

Andy
Yep I mentioned that concern in my original post "and I only have one battery. Still, if one battery went bad in the 6 volt option I would have no power as well."

There are a couple of advantages of the 6 volts over what I currently have. First and most important - they fit in my current battery box (with just a little modification to the height). Second, I would have 220 amp hours with 2 of these in series as opposed to my group 24's in parallel which provide 160 amp hours. That's enough of a difference to make it worth my time.

The 8DA provides 255 amp hours.

I don't really know what the exact affect on the tongue weight would be with switching to the 6 volts up front in the battery box, probably not huge. Removing the 2 group 24's completely and going with the 8DA further back might lighted the tongue weight by 40 or 50 lbs - have no idea. Not a huge deal either way. But trying to add the large 8DA up front likely would have enough of an impact that I would be concerned.
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Old 04-01-2012, 11:25 AM   #5
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My advise revolves around my own experience.....only.

When I up-graded our converter to an IOTA DLS-55 IQ4 for the improved charge profile I also changed out our Interstate grp27 deep cycles, (one had failed due to overcharging from the OEM P-lax), with Lifeline 100a grp 27's,
installed in the factory locations. I had also considered the 6v options and mod's, but after weighing the +/- decided that for what I was after, plus the added cost, time and effort it wasn't a viable option.

It all depends on what goals you set, for us it was just a matter of extending our off-grid battery life to more than 1-2 days. Mission accomplished. have gone up to 4 before needing a charge. We camp without hook-up's and use a LPG dual conversion 2000i when power is needed.

Bob
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Old 04-01-2012, 11:46 AM   #6
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The distance to coupler is a percentage of "dead weight". Greater the distance, the lower the percentage apparent at the ball.

RV.Net Open Roads Forum: Travel Trailers: Sherline tongue weight multiplier for tongue jack
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