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Old 04-08-2010, 09:04 PM   #15
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ok. so I finally got the info from the dealer. The factory battery is a 24 group, Interstate SRM 24.

...I realized that it is a "cranking" battery and not a deep cycle...
the srm 24 IS a deep cycle battery...

at least it is interstate (or johnson controls who makes them) 's version of a deep cycle.

and the hours at various "amp loads" is another way comparing capacity.

so now compare these with agms GRP 24s for capacity.

cheers
2air'
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Old 04-09-2010, 09:05 AM   #16
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Package ($800) plus batteries ($420) plus installation ($575) equals $1,795 versus $2,800 from AS. The difference covers cost for another panel and and inverter.
Ok, the price went up. My solar option was around $1800.
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Old 04-09-2010, 11:30 AM   #17
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Just a thought...if you've ordered a new rig to be built, perhaps AS has an 'option' to install a slightly larger battery box that will accommodate a pair of Group-27 batteries, to give you 200 AmpHr's...

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Old 04-10-2010, 07:07 AM   #18
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Ok, the price went up. My solar option was around $1800.
That was a good price.

Cheers
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Old 04-16-2010, 11:20 AM   #19
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Hard to beat this system from AM Solar - AM Solar's SunRunner RV100-22B Solar Electric System for RVs . Perhaps your dealer can install?

Attached is a the battery box lid design I had made to accomodate Lifeline (2) GPL-4C. Yields 220 amp hours @ 12V. Finished lid looks like it came from the factory! Any metal fabrication shop can make a similar lid with this design relatively inexpensively.

As was mentioned, a high quality 3-stage charge/converter is key to managing/maintaining healthy batteries. I went with the Xantrex XADC-80 and upgraded wiring, plus 2 more GPL-4C's inside for a total of 440 amp hours. With decent sun exposure, energy is never our constraint.

Good luck!
Attached Files
File Type: pdf Airstream battery box lid.pdf (12.2 KB, 287 views)
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Old 04-16-2010, 12:52 PM   #20
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Ostream, thanks a lot for the drawings. I was thinking of cutting the side of the factory battery box but your set up is much better. I can now upgrade the amps/hours of my batteries.

I am still undecided between the AM Solar kit or the AltE store. They are similar in price but the AtlE store has 130 watts panels therefore 260 watts versus 200 watts on a 2 panel set up. The AltE panels are Kyocera which is a great brand. The charge controller of the AM Solar system seems better than the AltE store but still "weak" for future upgrades if need be.
I am still unsure if I have enough room on the roof the 27FB international to get two of the 130 watt panels. I tried to get drawings of the roof of my "under construction" 27FB Intl from Airstream but so far nothing...
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Old 12-05-2012, 10:16 PM   #21
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Attached is a the battery box lid design I had made to accomodate Lifeline !
Thanks for this box design. I just had a local sheet metal place in Santa Monica CA put this together out of stainless. looks great!! Ordered my batteries today and am jazzed to set up.

have a Yosemite trip planned just at the crack of spring and it's going to be cold, needed more battery time for the furnace. also ordered a small Yamaha 1000 watt generator to supplement my solar as a backup.

thanks so much for sharing this!!

cb
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Old 12-06-2012, 07:42 AM   #22
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Right on!
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Old 06-30-2013, 05:27 PM   #23
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Enlarge battery box

What about cutting the bottom of the battery box off about 2 inches up from the bottom and welding a 1 or 2 inch piece in. You retain the original bottom and the bottom is still higher than the spare tire from the ground. This will allow a couple of 6 volt AGMs. It does increase the hitch weight. You can still open the storage door.
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Old 06-30-2013, 06:26 PM   #24
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When we replaced our two Group 24 Lifeline Batteries (we have factory solar and the rig cam with two Group 24s) we were told that we could fit two Group 27s in the battery box by removing the plastic tray that sits below the batteries. I know others have done this with success. However, we ended replacing the 24s with new set of Group 24's because I was uncomfortable about buying the 27's and then having hassles in getting them into the battery box. The 24s are stuffed in there as it is.

By the way, after replacing the batteries, I put self-adhesive weather stripping along the top edge of the box (so that it would be between the box lip and the lid) to keep moisture and dirt from getting in through the top of the box).
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Old 06-30-2013, 06:59 PM   #25
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Last Tuesday I changed out my stock Interstate SRM 24's with two Interstate GPL24T batteries. They fit perfectly. Also installed an AM Solar SunRunner Signature 100/25/6 Pro solar system with four 100W panels. Since I'd already swapped out the stock charger/converter with an Iota DLS 55, I have now changed all of the stock components in my new trailer. Oh, I did get the inverter package, but I'm contemplating a Magnum pure sine wave as my next foray into watts/volts/amps. When I look at what the factory charges for a solar upgrade and an inverter I really understand the value of DIY.
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Old 07-01-2013, 01:54 PM   #26
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some optima specs:
Optima Battery Optima Batteries Free Shipping! Best Service! Deep Cycle Batteries Yellow Blue Red Top Optimum
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Old 07-02-2013, 03:54 AM   #27
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For anyone interested in Optimas, the company below sells them for Prius's (which use a very small and hard to find size). I recently asked the owner if he sold other Optima batteries, because Costco quit carrying them; and he said that he could get any Optima size, but he hadn't had any requests for anything other than those that fit the Prius.

In any case, his prices are the lowest I have found, and he ships free out of Sylmar, California. I ordered my third battery from them on the Internet after midnight one Sunday night; and it was delivered in Phoenix, Tuesday at noon.

When our two Optimas in our Airstream and the battery in our Tundra need replacement, I'm ordering them from this company.

Optima D75/25 Yellow top

Notes:

1. The link above is for a Prius battery. However, it navigates to eLearnAid's web site where you can get information on marine deep cycle batteries. I think we have Optima D34M Blue Tops in our 19-foot Bambi.

2. I have no affiliation with this company other than being a satisfied customer.
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Old 02-09-2016, 09:48 PM   #28
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I wanted to update this thread:

1. the cover ostream designed was the talk of everyone who saw it on my trailer. the Dealership even wanted me to make a bunch for them! (i didn't)
2. the 2* Lifeline GPL-4CT 6V fit like a champ and i think i used my generator once or twice and didnt need to - with only 140 watt panel on the roof of the FC20.
3. I was frequently at 100% by noon while camping in CA [victron battery monitor]
3. i sold the Fc20 and upgraded to a 28' and put more solar up top, but am using the same 2 batteries. note the 2016 battery box is deeper and they fit without modification. OTOH - i may do the mod in the future because then i can get even taller batteries!

cheers! thanks again OSTREAM!!

chris
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