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fotoman1527 · 08-02-2015, 04:21 PM

The interior dimensions of my battery box are 15” long x 9/5” deep x 14” wide.

Battery Giant has a Deka DP31DT Group 31 Deep Cycle battery. The dimension of that Deka battery are the following: Length 13"; Width 6 3/4"; Height 9 1/2 - so that one should fit. the Deka has a little bit more than 100Ah.

Another battery that would appear to fit the case now is the Trojan 31-AGM, a glass mat option, which has 100 ah 20 hr rate, and at a size of 13.42 l x 6.81 w x 9.18 h. The Trojan 31xhs 130 ah is another option

However, the amp hour rate of these options that fit today would seem to be dwarfed by the battery of choice for so many on this forum: the Trojan-105 - 225 ah 20 hr rate. Trojan recommends the 105 RE, which has similar stats. This battery requires an alteration to the battery box, and I've been having trouble finding someone who will do it.

I plan to have both a solar and propane generator system, relying first on solar, so I am thinking I'd do well to wait to find someone who will enlarge the box and get the Trojan 105 RE!

Drathaar · 08-02-2015, 06:07 PM

Quote:

Originally Posted by SCOTTinNJ

Group 31's fit?

I've got photos (somewhere) of group 31s in a 25' FC FB. It took minimal mod as I recall. A bit of hacksaw and grinding work, then re riveting the lid hinge.

Found it...

switz · 08-02-2015, 06:43 PM

We built a custom stainless steel battery shelf and cover when we had four Lifeline 6ct 6Vdc 300 amp-hour batteries (92 pounds each battery) mounted above the original battery box that house the disc brake pump and controller for the Classic. That battery box assembly and four batteries was removed when we changed to one lithium iron phosphate 600 amp-hour battery that is mounted beside the Magnum under the Classic's front sofa. We dropped, the tongue weight nearly 200 pounds.

We are mounting a 300 amp-hour rated lithium iron phosphate battery in front of the street side wheel well under the side sofa along with the Magnum MSH3012 converter/inverter. This new battery actually weighs less than the two stock batteries that are removed from the front battery box. That existing battery box will become the storage space for the plastic wheel chocks and other very light small stuff.

GM Airstream · 12-01-2018, 02:55 PM

Hmmmm... well we have a older A/S and it had two of the bats inside each side... looked at changing the batt box their.. but gave up the idea... as it would require some major changes to the hull...as well as new doors.. etc...

So we elected to go with the gc bats out in the A frame... higher cap and cheaper... but to do this required that we first remove the tool box that came with the trailer from the manufacture...

We called A/S and asked for the price and part no of the new battery box that is going in the classics' ... not a good idea.. as they bounced us around from factory to dealer and back again saying it was not a part.. but made at the factory for the frame. ???

Ok... once we got a price.. and fell out of the chair... ($350) we decided to do the engineering thing.. and reverse engineer the box ... but, had to go travel to see one...

Of course they have to have a extension put on the top to do the GC bats... thing...
So we added the height to the new battery box design that we are having built...

Once we measured, took pix and dim the current one ... we got on the cad cam program and included all the upgrades into the design.

cost so far seem to be fair... about 100 bux for materials (12 ga sheet steel) and some labor from the metal fab place.

I also wanted to be able to take the gp 27 series and larger 11 inch high trojan bats... so far its a good build and upgrade 'em all...

As to weight difference and location.. not much their... we found that the GC add about 60 lbs to the a frame.. but where they are located in the box .. their centers are only 14 inches further forward of the manufactures location... so when we do the math.. its not much more on the ball...

I was considering have a couple of new boxes made.. as the price would be less...in quantity... but so far only my friend (his trailer) and I are in the mix. Nothing like improving the old gals (trailer) design to upgrade to better stuff.

should work out good..