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Old 02-27-2011, 07:41 PM   #15
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Originally Posted by barts View Post
i will absolute agree that given our low powered (relatively) charging circuits, and the oft-lamented permeability of Airstreams (e.g. they're not air or often water tight) , hydrogen build-up is not an issue.

However, a malfunctioning charging system can over time heat the batteries and boil the electrolyte - and if I'm sleeping nearby, I'd just as soon have the boiling sulfuric acid fumes vented elsewhere. Given sufficient heat, sulfur trioxide fumes eventually result.

Since sulfur trioxide (the gas that forms H2S04 when dissolved in water) is heavier than air, the battery vent I placed on our custom battery box will lead down through the floor. A nice bonus is that such vents are much less traumatic to put in, and don't need to look so spiffy.

- Bart
Perhaps, that's why the newer Airstreams have the vents (two of them in each compartment) at the base of the compartment door frame. Two of them presumably flows air better. No vents at the top of the compartments.
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Old 02-27-2011, 07:43 PM   #16
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**Disclaimer: you make your own decision on this.*****************

Going out on a limb here, but I don't believe venting to the outside is required. On the other hand, I do believe you want to be careful not to trap hydrogen in a small battery compartment. If there is reasonable air flow between your battery compartment and the open space inside the trailer you'll never get to an explosive concentration. And unless you've got the only airtight Airstream on the road, you'll never get a toxic level of hydrogen inside the living space, either.

I think you'll find that battery explosions happen when someone has a dead battery and you're jumping them. As soon as the engine gets started, there is a tremendous charge current and a dead battery will produce a significant amount of hydrogen. Right then the jumper removes one of the cables and creates a spark--boom. You will not find this cascading combination of doom in a trailer. Even if you've got a totally dead battery, your charge current will be lower and you won't be using jumper cables near the battery.

Dissenting opinions welcomed, especially if the dissenter can present a hydrogen moles/minute production curve, gas/air diffusion versus distance curves, spark source what-ifs, and technical data on explosion concentrations argument. "Everybody does it" won't fly.

Zep
True, but the OP was talking about venting into the refer comparment where there is an open flame.....I wouldn't want to try and sleep wondering how the breeze was blowing and maybe trapping hydrogen in the relatively small compartment.
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Old 03-01-2011, 01:12 AM   #17
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Originally Posted by Zeppelinium View Post
..I think you'll find that battery explosions happen when someone has a dead battery and you're jumping them. As soon as the engine gets started, there is a tremendous charge current and a dead battery will produce a significant amount of hydrogen. Right then the jumper removes one of the cables and creates a spark--boom. You will not find this cascading combination of doom in a trailer. Even if you've got a totally dead battery, your charge current will be lower and you won't be using jumper cables near the battery.

Zep
They sound about like a .38 going off if you manage to set one off. Then you gotta get some baking soda water to wash off the battry acid, and since it's like below zero that goes to freezing and you still have to go get another battry, and that one's dead too so you gotta find the fourth battry and by then you're really late to work, with freezing baking soda

Just saying. I like the idea of a covered box venting through the floor, even though H2 is light.
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Old 03-07-2011, 08:18 PM   #18
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Working on a 64' Safari and wondering if I can run the vent hose from my battery box up through the fridge vent? Trying to keep from putting more holes in my trailer.
Only an option to consider. On mine I saw all that weight allready on the street side and wanted two batteries. The space in the bottom of the closet between the furnace and the tub/shower accepted two batteries in a homemade sealed box with a hinged lid. Two 1" i.d.vents, one straight out the bottom, the other teed into the existing plumbing vent stack thats in the closet anyway. Tight fit side to side but 41/2''s of space to the floor between the box and the closet door. Gave the box an extra inch of height to accept a rubber insulator pad under the batteries.
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Old 03-07-2011, 09:33 PM   #19
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My two cents, if batteries don't vent much and it disipates readily, why did half of my battery charging in open air outside in Florida sun disappear? Only found parts in yard.
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Old 03-07-2011, 09:49 PM   #20
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A vent through the floor will still leave a box full of hydrogen, not a good idea in my opinion. Every sealed battery box I've ever seen in an Airstream has a tube leading from the top, going sideways and/or up to a hole of some sort out the side of the trailer. Remember the Hindenburg, hydrogen goes up naturally, not down.
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Old 03-07-2011, 09:55 PM   #21
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Originally Posted by dznf0g View Post
Perhaps, that's why the newer Airstreams have the vents (two of them in each compartment) at the base of the compartment door frame. Two of them presumably flows air better. No vents at the top of the compartments.
Keep in mind the the battery doors don't seal at all & I believe the two holes at the base are there to let water out, not gas.
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Old 03-07-2011, 09:58 PM   #22
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AGM sealed glass mat batteries...no vent, no worries!
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Old 03-07-2011, 10:06 PM   #23
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AGM sealed glass mat batteries...no vent, no worries!
No hassle dc power........................expensive but they work & takes away the venting grief.
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