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Old 06-26-2017, 04:39 PM   #1
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Wanted to share my dual battery project

I did this over a month ago but i have not shared the results yet so i thought i would. Now to start i took this to the dealer and they told me that two batteries would not fit and that i would have to use smaller batteries in order to make it work. I swear those guys have no "out of the box" ingenuity.

Well two full size batteries do fit, they actually fit perfectly.

First i removed the one battery.

Then bolted down a piece of plyboard and screwed it through the metal support strips below.

Then i set the two batteries on the plyboard and used a pencil to mark their locations.

Then i took scraps of wood i had and glued and screwed them down on the pencil lines i had drawn. The two batteries fit perfect in the basic block box i made.

Then i took the two batteries out and used some spare straps i had and screwed them in place under where the battery would sit on them.

Then put the batteries back in place and strapped them in.

But not quite perfect, since i did not use flat heads for the staps, and did not inset the screws the batteries wobbled just a bit, so i used some used popcicle sticks as levelers and glued them in the corner to balance the batteries.

Then cut each end of the two covers off so they would fit together and used pull ties to pull them tight.

Then just added a bungie over the top of the covers.

Those batteries are not going anywhere unless i roll the trailer. Knock on wood...

Two things i would have done if i had to do it over. First was to inset the strap screws or use flat heads. Second was to prepaint the board.

Im not sure if water gets up there or not while going down a wet road but just in case i plan to paint the bottom of the board.

But i am worried that since i will be going to humid country for a month or so that the dry board could soak up some moisture and rot on me before i can get back to dry air country. I dont know how quickly that would happen, but i dont want the humidity to weaken that board.

Turned out just fine in my book for the first try....

Now my meter shows im getting 13.5 volts.
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Old 06-26-2017, 04:49 PM   #2
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Get a can (maybe two) of the automotive rubber undercoating and spray the wood.
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Old 06-26-2017, 05:19 PM   #3
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I forgot i have some of that left over from when i undercoated my truck, good thinking ill have to check my bin and find it... thanks...
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Old 06-26-2017, 05:37 PM   #4
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Nice neat job. The nerve of these people thinking we should be happy with only one battery. No imagination!
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Old 06-27-2017, 08:09 AM   #5
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Good job! I've done many improvements to RVs over the years. 80 on my current coach. Most make full timing in it more enjoyable/easier.
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Old 06-27-2017, 08:28 AM   #6
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Get some cheap paint as it is good for this...

Pull out the batteries and slather the wood well.

The wood is a sponge and will absorb any liquids.

The paint is resistant to the acid a bit and seals the wood.

Unpainted it will not last near as long as painted.

Whatever paint that you may have handy will work.
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Old 06-28-2017, 08:01 AM   #7
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My 6 house batteries had long bolts and metal brackets holding them down. 4 times in 2 years. I cleaned and recoated with grease to try and stop corrusion. Openings in venting caps allowed the sulfuric acid to escape rerusting in a short time.
Got ride of bolts and brackets.
Using plastic tie downs from Harbor Freight. Batteries are cleaner, no rust, cheap to replace straps, if ever.
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Old 06-28-2017, 03:10 PM   #8
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The nerve of those guys telling you it couldn't be done! They just don't know RV'ers very well, do they!

Good job Dave!
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Old 07-01-2017, 01:36 PM   #9
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Dual house battery project

We have an older 1993 Pace Arrow 35' motor home, with which we like to dry camp, but it lacked some of the more modern amenities. The coach had a large basement compartment just forward of the entry door into which just fit two Interstate 8D (big truck) batteries in their plastic battery boxes, which we installed. Just inboard of these batteries, on centerline, we installed a 3000W Xantrex inverter wired into the coach's 120 VAC system with a remote ON/OFF switch in the electrical panel up over the door. The installation required a 110 VAC automatic prioritizing switch: 1 = Shore Power / 2 = generator / 3 = inverter. We then installed a modern, computer controlled converter for optimum battery charging through shore power or the generator. Finally, we ran a hefty 12 VDC cable up to a herky 12 VDC receptacle (no cigarette lighter) at the computer table, to which is connected a 500 W inverter and installed a 12 VDC digital voltmeter with a two position momentary switch in the electrical panel over the door, connected to both the house and the start battery banks. We now arrive at our dry campsite with enough stored power for several days camping without having to run the generator. We have future plans for solar on the roof. Sorry, no pictures immediately available! George
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Old 07-07-2017, 04:04 PM   #10
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Doesn't matter what you us that wood will rot, and soon period. otherwise manufactures would use.
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Old 07-07-2017, 04:14 PM   #11
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If you have wet cell batteries you can add mineral oil to the cells and cut WAY down on the corrosion and need to add distilled water. Did that in 2004 to the 4 OEM Interstate U-2200's and they worked fine for 10 years and were clean after 4 years of never being cleaned. After 13 years it still had the original battery hold down straps too.
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Old 07-07-2017, 04:15 PM   #12
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The wet cell batteries in my boat are sitting on bare plywood. It's glassed in on the edge but no coating on the flat surface.

The boat was but in 1984 and the wood is getting a little worn but still holds the 8 batteries.

I think the wood should hold up for a few years at least.
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Old 07-07-2017, 04:46 PM   #13
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Thanks, yeah i could be wrong but from watching some wood shop programs i think its most important to cover the end grain at least, so it does not soak up so much moisture.
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