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Old 04-01-2012, 08:56 PM   #11
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I would personally do the two 12 volt GEL Batteries - which is what I am running now.
The only change I would make is add a battery cut off switch that allows me to switch between each battery or allow them to be combined at the same time - Blue seas makes one. I have an on and off battery cut off switch now but eventually I am going to change it out
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Old 04-01-2012, 09:14 PM   #12
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Check out the battery FAQ Sticky in the FAQ section.

I believe there was some issue with GEL batteries in a deep discharge scenario. I will have to re-read it to refresh my memory.
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Old 04-01-2012, 09:20 PM   #13
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turfed the origional ..

Basically i gave away the RV/marine battery, and replaced them with two group 31 deep cycles. This does not strain the the 12 volt charging system ... and gives us much longer dry camping time. If you are considering moving to off the grid camping stuff, and going solar ... like we go ... this first step is a good way to go.
Seriously .. when you think about it .. these Aframes are all set up to be off the grid anyways .. with a few ideas and options.

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Old 04-01-2012, 09:26 PM   #14
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Quote:
Originally Posted by herk7769 View Post
Check out the battery FAQ Sticky in the FAQ section.

I believe there was some issue with GEL batteries in a deep discharge scenario. I will have to re-read it to refresh my memory.
you mean this -

Gelled batteries, or "Gel Cells" contain acid that has been "gelled" by the addition of Silica Gel, turning the acid into a solid mass that looks like gooey Jell-O. The advantage of these batteries is that it is impossible to spill acid even if they are broken. However, there are several disadvantages. One is that they must be charged at a slower rate (C/20) to prevent excess gas from damaging the cells. They cannot be fast charged on a conventional automotive charger or they may be permanently damaged. This is not usually a problem with solar electric systems, but if an auxiliary generator or inverter bulk charger is used, current must be limited to the manufacturers specifications. Most better inverters commonly used in solar electric systems can be set to limit charging current to the batteries.
Some other disadvantages of gel cells is that they must be charged at a lower voltage (2/10th's less) than flooded or AGM batteries. If overcharged, voids can develop in the gel which will never heal, causing a loss in battery capacity. In hot climates, water loss can be enough over 2-4 years to cause premature battery death. It is for this and other reasons that we no longer sell any of the gelled cells except for replacement use. The newer AGM (absorbed glass mat) batteries have all the advantages (and then some) of gelled, with none of the disadvantages.

I read the instructions to the converter / charger and it says it will charge gel batteries without an issue besides I get my GEL batteries for free since my brother works for a place that installs and frequently replaces Large Building UPS's that use these batteries
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Old 04-01-2012, 09:55 PM   #15
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Yep, that was it...
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Old 04-01-2012, 10:23 PM   #16
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Ditto what D-mo did. Like him, I switched out the group 24 and put in two group 31s, and use solar panels to slow down the discharge rate--they might actually charge the batteries given enough time and light, but for shorter campouts they just supplement.
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Old 04-01-2012, 10:44 PM   #17
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If you were going to choose 1 12V battery to get the maximum storage capacity which one would you get. The Trojan SCS225 looks good with its specs. We are usually pretty good about conserving power and I really don't want to added expense and tongue weight to have two batteries.

I'd love to put one really good battery and maybe a solar system on the roof to not necessarily recharge the battery fully every day but maybe added enough back in to extend the trip 1-2 days.
This is what we have done. One 130 amp 12V Trojan. Works well.
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