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Old 04-28-2007, 07:21 AM   #29
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Thumbs down Bad idea

Quote:
Originally Posted by Pacerized
Thanks Mark:

I found a site online for this box, but it only showed a 24 series size. I'm looking to add a 29 series battery with the box. I was also able to find another box that I think might work, but I"ll have to wait until mon. to call them.

One more question for everyone:
Is it o.k. to mix 2 different sizes of batteries. My original external box will only hold up to a 27 series, but I have room to add a 29 series inside with the ventilated box. I'll be buying both new since my old battery needs replaced anyway. Is there any issue with the 27 series having a slightly lower cca that it might wear down the bigger battery in much the same way that an older battery could if it were mixed with a new one?
I appreciate the advise, just finding this box will save a lot.
Charlie
Charlie,

Any battery bank should contain the IDENTICAL type and size of battery. It's a BAD idea to mix and match for a number of reasons, one being differing draw down dates for the unequal batteries and the other being VERY different charging rates that would do strange and serious things to your converter/charger, not to mention to the batteries themselves.

Everything that I've ever read or learned about battery systems points to identical batteries in a bank, even down to the same date of manufacture!
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Old 04-28-2007, 10:56 AM   #30
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Quote:
Originally Posted by rseagle
Very similar arrangement to mine. Good job!
It ought to be, since I got most of my information from you. Thanks for the help! jk
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Old 04-28-2007, 10:17 PM   #31
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Mark, and Lewster:
Thanks for the info again. I found a 29 series without the 3/8" plastic lip that I had around my old 27. It's tight but it will fit in my original battery box. The battery is a little under 13" at the top, and 12.5 at the base. I found a company in Denver that sells a similar box, but it's slightly smaller then the PPL, however no shipping fee. I'm going to check it out, and if it works I'll go with it. If not, I think I'll order the PPL, and get it done this week. The size of the PPL box will defiantly work with the 29's, and 2 of them fit with a littler slack were my old univolt used to go. With 3 29 series batteries I get 375 AH. We're going on our first outing of the year to Arches park on May 9th., and will be dry camping. It'll be nice to not have to worry about running out of power.
Thanks: Charlie
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Old 04-29-2007, 05:47 AM   #32
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and the other being VERY different charging rates that would do strange and serious things to your converter/charger,
lewster, can you elaborate on this statement? I don't get it. Thanks
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Old 04-29-2007, 07:35 AM   #33
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Quote:
Originally Posted by FrenchBern
and the other being VERY different charging rates that would do strange and serious things to your converter/charger,
lewster, can you elaborate on this statement? I don't get it. Thanks
FB,

When a 3 stage charger 'reads' the state of charge in your battery bank, it is based on the assumption that your 'bank' is composed of identical batteries. Mix-and-match batteries will not charge at the same rate and will not give the charger the proper information that it needs to lower the charging voltage to the next 'stage'.

The charger will then continue to charge at the higher rate, possibly causing battery damage, as well as potential damage to the charger's electronics.
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Old 04-29-2007, 10:32 PM   #34
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Quote:
Originally Posted by markdoane
You can buy a vented battery box at many RV parts houses. LaVanture products makes one.

I just bought one for about $26. It's plastic, has a tongue and groove seal. You do need a hose and outside vent.

I plan to use AGM batteries, but I still use a vented box. I never know what the next owner may do.
Mark:
I also noticed this site with what appears to be a larger Lavanture box then the one I first found, the price is much better then the ppl box, and the external size would work better. While the dimensions given for the larger PPL box would hold the 29 series, this Lavanture box is right on the edge of working. It list the internal length at 12.75 inches. The 29 series battery I'm looking at is 12.5" at the base, but it's just under 13" at the top due to some plastic ribs that are larger near the top. The box looks to be slightly wedge shape, and smaller at the base. If you have this same box, and it's not too much to ask, would it be possible for you to measure the internal length at the top?Boat-N-RV Warehouse Online Store
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Old 04-29-2007, 11:28 PM   #35
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Charlie,

The box I have is 12 13/16" inside, at the parting flange, and 12 9/16" at the top where the vent fitting is located. Unless you can grind off the ribs, I think its a no-go.

The top of the battery will extend most of the way into the top of the box, so the top of the battery would need to be less than 12 5/8".
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Old 04-30-2007, 12:50 AM   #36
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Quote:
Originally Posted by markdoane
Charlie,

The box I have is 12 13/16" inside, at the parting flange, and 12 9/16" at the top where the vent fitting is located. Unless you can grind off the ribs, I think its a no-go.

The top of the battery will extend most of the way into the top of the box, so the top of the battery would need to be less than 12 5/8".
Thanks a lot for checking. I was thinking of the top of the base section at the separation point as needing to match the top of the battery. You're correct of course that I should have been thinking of the top by the vent. There would be no way to make that one work. I guess I'm stuck with getting the ppl, or hoping the one I found in Denver works. I can't tell from this website what brand, or internal size it is, but I hope to find out tomorrow.
Charlie
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Old 04-30-2007, 10:27 AM   #37
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Iím glad that I too came across this thread. Iíd assumed AGMs like LifeLine would be perfectly safe under the bed.

From all the illustrations Iíve seen itís not apparent how the cables run in and out of the box. Are there vapour proof openings?

It seems a regular battery box could easily be vented to the outside with a flex tube of some sort, which would save the trouble of tracking down the more exotic boxes.

Sergei
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Old 04-30-2007, 10:47 AM   #38
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Sergei,

The "sealed" boxes have a foam gasket, and the gasket crosses the openings for the cables. Not a very workable solution in my opinion.

I added two pass-throughs on the box that I am using. It locates the cable connections on the top of the box where it is easy to connect and disconnect.

I think by the time you added a nipple and a way to seal the edges, using a regular boat type battery box may not be that much cheaper or easier.

Here's a picture of the cable pass-throughs I made. Just a couple of 1/4" threaded brass rods and an insulated boot.
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Old 04-30-2007, 11:03 AM   #39
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Mark:

Thanks.

Just to make sure I understand your photo:

The positive and negative posts are some sort of ďpass thruĒ device that screws into the lid? The battery cables attach to the inside portion and you use separate, perhaps made up, cables attached to the outside portion of the device?

The black and red markings are decorative, added by you for clarity?

Did you add the 90^ fitting with clamp or does that come with the box?

I donít think making your own box necessarily saves money but it saves searching around for something that might be a compromise in the end.

If you make your own box itís purpose made.


Sergei
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Old 04-30-2007, 11:08 AM   #40
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Nice work Mark!
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Old 04-30-2007, 12:18 PM   #41
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Yes, the pos & neg taps are just a short piece of threaded brass with nuts and washers. Cables attach from the battery terminals to the bottom of the taps, and from the outside to the chassis ground and distibution panel. You can buy feed-throughs that are similar.

The battery box is located on the pantry floor and difficult to access. I only need to disconnect the cables at the taps and I can easily drag the whole battery and box out of the closet for maintenance.

The red and black markers were from Northern Tool. Nice touch I thought.

The grey coupling and elbow are fitting that I added.
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Old 04-30-2007, 03:11 PM   #42
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The Markdoane Pre-Memorial Vented Battery Box

Mark:

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

Thanks for the idea.

Sergei
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