Venting Battery into vent pipe for holding tank - Page 2 - Fiberglass RV


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Old 08-28-2012, 08:19 AM   #15
Raz
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Originally Posted by LWEBB View Post
Is an AGM just a sealed deep cycle battery? Walmart has some for marine trolling motors. Are those the same thing?
Lanny
AGM or Absorption Glass Mat is a lead acid battery constructed more like a gel cell than a flooded battery. They have a number of advantages over flooded cells but are quite costly. I have one and so far (year 5) I am very happy with it. Raz
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Old 08-28-2012, 08:26 AM   #16
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Derek, It's not in my Casita, it's in my Wally Byam Holiday. It's just a three sided plywood seat mounted in a corner for the other two sides. It's got gaps of 1/4" in a couple places. I'd just feel safer with a box since other stuff will be stored under the seat as well.
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Old 08-28-2012, 08:36 AM   #17
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Lanny;

Short summary, vent the battery box, both from below and above. Venting only works if there is an in and an out to create flow.

I would not connect to your black water vent, becasue of the risk of fumes, and if low enough, even fluid entering the battery box.

I put a new battery box in my trailer this way.

The best amateur photography lives on Webshots

and the next 10 or so photos. The items in the vent holes are trailer sink strainers backed with window screening to prevent bugs from getting in either the floor inlet or the top exit vent. The top exit vents out the side of the trailer. I used a water fill cap and cut angled vent slots in it with a rotary tool to vent and also to prevent water coming in when it rains. The inside of the vent is backed up with a piece of 3/4" plywood.

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Old 09-18-2012, 11:14 AM   #18
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Hey Folks I'm back.
OK I have vented my battery into the black water vent stack. Although the pict doesn't look like it, it all slopes up.

I have put in a small 12 volt sparkless bilge pump fan which pulls air from both the black water and battery box. The black water is pretty much sealed so most of the time the fan will only pull air through the battery box.

All works great except the fan is too strong and noticeably loud. Works great on 9 volts though and hardly makes a sound.

I'd like to cut the power down to the fan from the 12 volts to 9 volts.
Anybody know how to do that? I need some way to reduce the current to the fan.

I installed a 110 relay switch to one leg of the fan so the fan will only come on when I'm plugged into 110 .

Any ideas?
Lanny
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Old 09-18-2012, 12:06 PM   #19
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..........I'd like to cut the power down to the fan from the 12 volts to 9 volts.
Anybody know how to do that? I need some way to reduce the current to the fan...........Any ideas?Lanny

OK, you have your low tech choice and your high tech choice.

High tech, use a DC-DC converter. You put 12 volts into this thing and adjust the little brass screw until you get the voltage that you want. Maximum current is about 2 AMPs.
LM2596 DC Step-Down Adjustable Converter Power Module | eBay

Low tech, you put a resistor in series with the fan. I'll leave it to the EE's to explain how to calculate the ohms and wattage.
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Old 09-18-2012, 04:57 PM   #20
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Raz: Is your AGM battery inside your trailer and vented to the outside?

The Optima AGM Spiral Cell battery User Guide states:

Trunk/Interior Mounting - If battery is mounted inside passenger compartment or trunk, it must be vented to outside of vehicle.

I was wondering if a sealed AGM battery that is classified as NONSPILLABLE could be safely located inside a trailer without venting, but it seems this is still not a good idea.
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Old 09-18-2012, 05:40 PM   #21
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Raz: Is your AGM battery inside your trailer and vented to the outside?

The Optima AGM Spiral Cell battery User Guide states:

Trunk/Interior Mounting - If battery is mounted inside passenger compartment or trunk, it must be vented to outside of vehicle.

I was wondering if a sealed AGM battery that is classified as NONSPILLABLE could be safely located inside a trailer without venting, but it seems this is still not a good idea.
No, my battery is located on the tongue. We just bought a Subaru that has a low tongue weight limit so I toyed with the idea of relocation inside but was able to get my tongue weight down in other ways. Mine is a Lifeliner. Initially they were advertised as requiring no venting but I see Lifeliner has added:
Never install batteries in an unventilated compartment or a sealed compartment or sealed container.
That said they also include this safety statement in regard to using their batteries in rv's, boats and aircraft, which leads me to believe inside placement is a viable option.
Lifeline Batteries - Marine & RV Deep Cycle Batteries
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Old 09-18-2012, 06:01 PM   #22
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No, they are not the same thing. AGM batteries have the electrolyte inside in paste form while regular batteries, whether sealed or not, have liquid electrolyte (sulphuric acid). The liquid can give off hydrogen gas when charging and even bubble out acid if overcharged, AGMs do not. All lead acid batteries self discharge just sitting there, AGMs do this 10x less than wet batteries. AGMs can sustain high current discharge (and charge) better than wet. Of course there is a downside, AGMs cost 2 to 3x as much as lead acid.

Optima is one brand, Concorde Lifeline is another with a little more capacity per pound of weight or $ of cost. There are other less well known brands as well.

I personally would not want a wet battery in the trailer with me but a sealed wet battery vented to the outside would probably be OK if thats what the budget required.

If you go with a sealed wet battery, do get one with a hose barb that enables a plastic tube to attached that would route any acid discharge overboard.
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Old 09-18-2012, 07:38 PM   #23
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I use an AGM battery in my diving Hookah totally sealed unit.
The compressor is on top of the battery draws 25 amp hours.
You won't get more sealed than this as the unit is water tight.

The fact is you would be hard pressed even with a vented battery to create enough H2 to be a problem the bigger issue is making sure the vent of the battery is open to allow the gas to escape the battery itself.
Just look under the hood of any car.
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