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Old 10-28-2012, 09:41 PM   #29
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Brad,
Check out this DIY Network YouTube video series. Somewhere there are instructions as to how the installed the 12V coach battery underneath the bed, and vented it outside as well.
Honestly, I started at video #1-01 and watched all the way through, very interesteing to be honest.
Good luck, Derek

Airstream Restoration - 01-1 Introduction - YouTube
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Old 10-29-2012, 08:37 PM   #30
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Derek,

Interesting restoration series, although I don't know that I would call it "restoration" it's more like a sprucing up than anything. Leaving behind the old carpet under the bed just seems tacky to me

The battery video isn't bad although I take exception to the fact that they used a cheap white plastic louver on the outside of the nice aluminum shell. Also they will have mud daubers inside the trailer in no time since they didn't put a screen over the opening. Mud daubers will fly in that opening, into the battery box and out the openings in the battery box into the under bed area. Not fun

Here's the battery installation video.

Airstream Restore DIY 09-4 Batteries - YouTube

Thanks for pointing this series out to me, I'll have to start watching them in my spare time.

Brad
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Old 10-29-2012, 11:11 PM   #31
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It is a nice battery box. If anyone ever finds a source for it, I would like to know.
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Old 10-30-2012, 06:07 AM   #32
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It is a nice battery box. If anyone ever finds a source for it, I would like to know.
I believe this is the box. Still haven't found the vent hose kit but I'm sure it's out there somewhere. It is 14-1/2" tall. Now I need to measure the compartment under the couch/bed and see if it will fit.

Dual GC2 battery box

Brad
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Old 10-30-2012, 07:14 AM   #33
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I believe this is the box. Still haven't found the vent hose kit but I'm sure it's out there somewhere. It is 14-1/2" tall. Now I need to measure the compartment under the couch/bed and see if it will fit.

Dual GC2 battery box

Brad
Looks like the one in the video, all right. Another possibility might be Battery Boxes from BD Batteries

Looks like they used a QuickCable "QuickBox" brand vent kit, or similar. Actually two kits, one for the inlet, one for the exhaust. The QuickBox kit can be found at Quick Cable: Battery Box Vent Kit. It's worth checking out the "how-to" video at the web site, even if you buy a kit from sonewhere else. It shows more of the nuts-and-bolts end of the installation than the Airstream restoration video does.
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Old 10-30-2012, 09:14 AM   #34
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IIRC hydrogen sulfide gas is given off when charging batteries ... in your respiratory system - remember those HS chem classes years ago - the hydrogen sulfide recombines with oxygen, O2, + water, H2O, and forms weak sulfuric acid, H2SO4 (or, outdoors - acid rain). Stay away from those fumes ... they are corrosive to metal and very bad for the lungs in any concentration. AGM for inside batt locations.
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Old 10-30-2012, 09:26 AM   #35
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Thanks for the help on locating the battery box. Much appreciated.
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Old 10-30-2012, 09:32 AM   #36
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IIRC hydrogen sulfide gas is given off when charging batteries ... in your respiratory system - remember those HS chem classes years ago - the hydrogen sulfide recombines with oxygen, O2, + water, H2O, and forms weak sulfuric acid, H2SO4 (or, outdoors - acid rain). Stay away from those fumes ... they are corrosive to metal and very bad for the lungs in any concentration. AGM for inside batt locations.
Off-gassing is why battery boxes are vented to outside, and sealed otherwise. You're not the first to point out that AGM is preferable for batteries located inside the living quarters; we're all pretty much in agreement on that score.

When charging wet-cell batteries, if you're charging a good battery it releases hydrogen gas. If you're charging a bad battery (damaged plates, or low on electrolyte) it can release hydrogen sulfide gas. Neither gas is good to breathe.
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Old 10-30-2012, 03:55 PM   #37
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Off-gassing is why battery boxes are vented to outside, and sealed otherwise. You're not the first to point out that AGM is preferable for batteries located inside the living quarters; we're all pretty much in agreement on that score.

When charging wet-cell batteries, if you're charging a good battery it releases hydrogen gas. If you're charging a bad battery (damaged plates, or low on electrolyte) it can release hydrogen sulfide gas. Neither gas is good to breathe.
I may or may not be deviating from why I originally started this thread but should I decide to switch to AGM batteries how does a person decide what size to get? Previously for our 310 we just bought two 12 volt deep cycle batteries and called it good and never really paid attention to what amp rating they were. Of course the last time I bought batteries like that was while sitting in a Wal-Mart parking lot with dead batteries

So for a small 20' Argosy motorhome what size AGM battery(s) would be appropriate? I'd like two batteries but am not yet convinced I can fit two in the space. I might have the space available question answered this weekend.

Thanks,

Brad
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Old 10-30-2012, 04:22 PM   #38
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My general rule for coach batteries is to get the largest amp/hr battery I can fit/afford. More really is better in this case. More Amp/Hr means more run time. I hate to run out of juice.
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Old 01-21-2013, 09:10 PM   #39
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A few notes on installing batteries,
1. All lead acid batteries give off both gas AND heat, do not seal them in boxes where they hold the charging heat.
2. In our marine installations we ONLY use AGM batteries from LifeLine. These have proven over the years to be by far the best battery available at any price. No they are not cheap but installed and charged right we are getting 6 years plus service, sometime up to 10 years.
There are many ways to do any job, each installation will be different.
We also use the AGM batteries from emergency communication set ups where the batteries may sit for 6 months or more between charges.
Hope this helps......
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Old 01-22-2013, 04:17 AM   #40
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1. All lead acid batteries give off both gas AND heat, do not seal them in boxes where they hold the charging heat.
All battery boxes should be vented to the outside of your unit, and be large enough to allow at least an inch of air space all around each battery. A vented box is not sealed and will not trap heat or fumes.

They should only be "sealed" to the extent that there's a gasket around the lid to make sure all fumes go outside through the vent, and not inside around the edges of the lid.
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Old 01-22-2013, 06:54 AM   #41
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Thanks All, for the advice. After looking at the rear compartment where I was hoping to place a battery or two I've come to the conclusion that there just isn't enough room for a battery box with a vent. I can get a box to fit no problem but there is no easy way to get a vent to the outside that would be higher than the box. So rather than hack things up I'll find a location up front somewhere for the battery.

Thanks,

Brad
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Old 01-23-2013, 07:17 AM   #42
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The PO of my moho added a battery box external to the coach. He bolted a framework on to the chassis under the entry steps (kinda like where batteries are on the later silver mohos). There's a single group 27 there. If it ever warms up a bit and I get up the gumption to lay on the dirt floor of my storage barn, I'll shoot some pics. I'm not sure if this would be an option on a 20'er or not.

In my trailer, I have one AGM under the bed. The original battery location was near the rear of the trailer and it actually fell out!!! going down the highway. I chose not to risk that again and bought an AGM specifically to go inside the living space. It is literally right under where my head is when sleeping. I also have an Iota charger / converter; so I feel safe that there's no issues.
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