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Old 04-30-2007, 03:36 PM   #43
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Mark:

OK. When I copy this I am going to name it the Markdoane Pre-Memorial Vented Battery Box.

Thanks for the idea.

Sergei
You can name it the Mark Doane Veteran Memorial Vented Battery Box. Mark Doane passed Feb 17, 1976 and is buried in St Cloud, Minnesota.

He was my wife's uncle and the original owner of our Tradewind, so I use his name as a screenname.

He was a WWII Vet.

Thanks,

Don in Wayzata
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Old 04-30-2007, 10:18 PM   #44
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Mark:
Nice set up with the box conversion. I didn't notice a vent hose running from the elbow, but you said that you were using an AGM battery, so I guess you didn't need it. I ended up ordering 2 of the same boxes that PPL had from Dryers for just a little less. I'll be needing to run the exhaust hose from the box. I was wondering if I should run a simply duct to the outside by connecting a long hose to my existing battery box vent,or if I should drill through the floor, and put a fitting beside each box. I hate to drill through the belly pan, but it would be a simpler setup. Is it a bad idea to drill through the belly pan?
Thanks: Charlie
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Old 04-30-2007, 10:45 PM   #45
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Charlie,

There's no vent hose because the top of the box is sitting on the table in my solarium. The rest of the box and the hose are out in the trailer. I'm working on it.

To set the battery box up according to "the code", you need both a lower air inlet and an upper vent outlet. The top hose needs to go through the wall or out through the roof. Mine connects directly to the graywater tank vent. It's important that the hose goes directly up, with no obstruction or traps. The purpose is to let hydrogen escape and not be allowed to collect in any pockets. Running the top outlet hose through the floor would not work. Hydrogen would not have a way to escape.

The bottom vent should go through the floor.
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Old 04-30-2007, 11:24 PM   #46
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That makes sense Mark.
I assume the Hydrogen would not travel down to the floor very well due to it's being lighter then air. Would I have to also cut a hole for the bottom inlet vent, or would simply elevating slightly be safe? Would I run any risk of any gases escaping through the bottom? If I run the long hose to the existing battery vent it's more parallel then up. I do have an opening up, and behind the couch that I could run a hidden pipe to.

Charlie
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Old 05-01-2007, 07:10 AM   #47
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Charlie,

If you cut a vent hole in the bottom of the box, but do not connect it to the outside, there is a risk of hydrogen being blown out the bottom vent and into the trailer.

I'm not saying it would happen, but the guys who write the regulations that cover things like this think it could.

Here is chapter and verse from the NEC: http://www.airforums.com/forums/333331-post13.html
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Old 05-01-2007, 09:09 AM   #48
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Don:

Thanks for the information on Mark. The story gets even more interesting.

Man, am I glad I noticed this thread. We are about to start installing the battery compartment and 12v distribution and reading references to “sealed”, “no gassing” AGMs over many months lulled me into thinking they were perfectly safe in the open under my bed.

Blue Sea has what you made, I think. They call them “feed through connectors” and they are available in red and black.

http://bluesea.com/category/9/productline/overview/11

By the time I track down brass rod and nuts it may be simpler to order terminals from Blue Sea but where did you get the rod?


Sergei
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Old 05-01-2007, 10:51 AM   #49
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By the time I track down brass rod and nuts it may be simpler to order terminals from Blue Sea but where did you get the rod?
Ah, it's hard to keep a secret on this thread. The two screws in the middle were originally just like their big brothers.
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Old 05-01-2007, 04:54 PM   #50
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Don,


The only brass bolts I can find at the local hardware are toilet seat bolts. They are 5/16” National Coarse Thread and would work well I think but they come with only one nut.

I would need to find a source for more brass nuts and washers.

What did you recycle to make your terminals?


Sergei
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Old 05-02-2007, 08:40 AM   #51
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Don,
I would need to find a source for more brass nuts and washers.
Sergei
Sergei,

Just keep looking. You might need to go undercover on this one.

I would be reluctant to ask the hardware guy if he has "Brass Nuts". That would get you "throwed out" from my local TruValue.

Or you could use stainless.
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Old 05-02-2007, 09:18 AM   #52
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hi jk3500

...

i still have not seen sound justification for 2x6 volt over 2x12 volt.

or 4x6 volt vs 4x12 volt...

who wants to go first?

cheers
2air'

This topic is of great interest. What advantages do 6 volt batteries have?
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Old 05-02-2007, 09:40 AM   #53
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As far as I have seen, the advantages of 6V batteries, especially GC (golf cart) or traction (forklift) batteries is that they are very rugged, inexpensive for the amps available, and generally have better Puekert factors than comparable 12V flooded batteries.

Disadvantages: if you only have two, one dead cell means you are screwed.
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Old 05-02-2007, 09:43 AM   #54
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What would be the ah gain over a large 12 volt battery?
I noticed JK showed the 6v at 244 ah. Is that per battery, or combined?

I'm not sure how many ah a 12v that took the same space as 2 6v batteries would bring. The series 29 12v has 125 ah, but it's still much smaller then 2 6v batteries.
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Old 05-02-2007, 07:12 PM   #55
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Lifeline Battery
Part Number
VoltsOverall Dimensions Length
in mm
Width
in mm
Height
in mm
Weight
lb - kg
Cold Cranking Amps 68º F32º F0º FRated Cap.
Amp. Hrs
20 Hr Rate
Minutes of Discharge 25
Amps
15
Amps
8
Amps
GPL-24T12v 11.13 283 6.77 172 9.25 235 5625.5800 680 550 80 149 259 524 GPL-27T12v 12.01 305 6.60 168 9.25 235 6529.5845 715 575 100 186 324 655 GPL-31T12v 12.90 328 6.75 172 9.27 236 6931.4880 750 600 105 195 340 688 GPL-4DA12v 20.76 527 8.70 221 9.44 240 13561.21595 1360 1100 210 390 680 1375 GPL-4DL12v 20.76 527 8.70 221 9.76 248 13561.21595 1360 1100 210 390 680 1375 GPL-8DA12v 20.76 527 10.89 277 9.41 239 16273.61975 1675 1350 255 475 825 1670 GPL-8DL12v 20.76 527 10.89 277 9.73 220 16273.61975 1675 1350 255 475 825 1670 GPL-U1T12v 7.71 196 5.18 132 6.89 175 2410.9325 275 215 33 50 93 185 GPL-4CT6v 10.28 261.1 7.06 179.6 9.62 244.3 66301095 925 750 220 492 856 1692 GPL-6CT6v 10.28 261.1 7.06 179.6 12.98 329.8 8237.20 0 0 300 690 1200 2205
This chart is from the Lifeline battery web site. If you look at the minutes of discharge at the 25 amp column, you will notice that a group 24 is rated at 149 minutes (standard Airstream battery). If you go down to the GPL 4CT (6 VDC golf cart battery, you'll notice that the minutes of discharge at the 25 amp rating goes WAY UP to 492 minutes. That's 3.30 times MORE BATTERY CAPACITY!! The only thing that comes close is the 4D or 8D batteries, and they are BEHEMOTHS!!!

When you factor in the much heavier construction, thicker plates and better depth of discharge for the golf cart battery, plus the fact that they are DESIGNED to be severly drawn down and then recharged on a regular basis, they stand out as being better for RV use than 12VDC batteries. They charge quicher and have more charge/discharge cycles in them by design.

This is why MOST major MoHo OEMs have switched over to multiples of 6VDC golf cart batteries in their higher-end units.

If you really want to go over the top.....get a pair of GPL-6CT's with a 25 Amp rating of 690.
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Old 05-02-2007, 07:14 PM   #56
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I guess the chart got a little corrupted .

Hope you get the gist of my post!
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