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Old 09-24-2017, 06:15 PM   #1
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2017 25' Flying Cloud
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Miramar Beach , Florida
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2017 vs 2018 Airstream Interstate (Can You Help Me)

First an apology to all folks on this board. I left for a while. When my wife would not let me get an Interstate, I bought a 2017 25 ft. flying cloud Twin. GREAT trailer however, I know from the start it was not for me. I HATE towing anything in a trailer. So after 7 months and only 1500 miles I have had it. I was JUST about to by an 2018 Entegra Anthem 44F for HUGE money. When my bride told me she did not want to RV that much, I no longer needed a Diesel Pusher, so NOW I can get my original choice of a Airstream Interstate Gran Tour with rear suspension. Because she is relieved the HUNDREDS of thousands of dollars I was going to spend is no longer. I can get the Tommy Bahama version. Now for my questions:

1) I like the 2017 vs. 2018 version because I don't like the new water heater or touch screen. Your opinion on this is much appreciated.
2) Since it is a 2017 vs 2018 and please be realistic with me, what discount mark up do you think is fare. %

I am going to buy it this week with her permission of course. I have waited long enough. Your help is welcomed and encouraged.
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Old 09-24-2017, 07:29 PM   #2
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2006 22' Interstate
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Gratz on joining the club.

Get the '17 (assuming it's cheaper) then put the savings into batteries and solar upgrades.
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Old 09-24-2017, 07:37 PM   #3
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Not sure if it helps, but I just bought a 2018. Discount was 18%
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Old 09-24-2017, 08:31 PM   #4
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2017 25' Flying Cloud
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Miramar Beach , Florida
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I get the solar panel. Explain the Batteries.
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Old 09-24-2017, 08:42 PM   #5
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Quote:
Originally Posted by sthrngary View Post
I get the solar panel. Explain the Batteries.
You need the batteries to store the energy that you get from the solar panels... the more batteries, the more energy you can store and the longer you can run without the need for the generator...
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Old 09-24-2017, 08:59 PM   #6
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It comes with 2-12 VoltDeep Cycle Maintenance Free Group 24 AGM's. Does the battery area have room for more?
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Old 09-24-2017, 09:24 PM   #7
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Quote:
Originally Posted by sthrngary View Post
It comes with 2-12 VoltDeep Cycle Maintenance Free Group 24 AGM's. Does the battery area have room for more?


No, but you can add a second battery tray and add 2 more batteries.
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Old 09-24-2017, 09:28 PM   #8
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Originally Posted by sthrngary View Post
It comes with 2-12 VoltDeep Cycle Maintenance Free Group 24 AGM's. Does the battery area have room for more?

Do not know, others that do will sure chime in... I am waiting for delivery of mine... and I can't find the specs on the ones installed in the Interstate. As you mentioned, those are 2-12 VoltDeep Cycle Maintenance Free Group 24 AGM, but I can't find the Ah value on those...

If space is an issue, another option is replacing the ones in the rig with some lithium iron phosphate (LiFePO4) batteries (I believe that this will require a different charger controller). Expensive alternative but you can get these with much higher capacity than anything found with AGMs.

I am doing my homework to understand what it will require to setup a system with LiFePO4 batteries. That is the route I wan to take.

And I just realized that the Tommy Bahama edition only has 100 watt solar panel instead of the 300 watt solar setup on the non-TB edition So I will need to invest in additional panels for what I want...

Check out this video... easy to understand...

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Old 09-24-2017, 09:40 PM   #9
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Not sure how you plan to use your Interstate but even if it's just to tailgate, having more battery and solar can make the generator obsolete when the weather is nice enough to avoid using the air conditioner. The generator is noisy and is why we rarely ever use ours.
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Old 09-24-2017, 09:54 PM   #10
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Originally Posted by FlyFishinRVr View Post
No, but you can add a second battery tray and add 2 more batteries.
Not sure what happened with my last post... got deleted or lost... or maybe I can't post videos (I need to read the rules)...

Anyway... the other option is replacing what you have with higher capacity units or even better technology. I do not know that the stock units capacity are (can't find the specs online), but you can replace them with LiFePO4 Lithium Battery packs that will provide larger Ah capacity... expensive alternative at around 1000.00 for each battery bank... and you would have to change the battery charger controller... but it would give you higher running times in the same amount of space that those two stock batteries are taking...

On another note... just realized that my TB only has a 100 watts solar panel where the same model without the TB interior, has 300 watts of solar panel...carp.. will need to look into that as well.

I am learning and reading on what I will need to modify my rig to increase solar/battery capacity to minimize the use of the generator... not sure my budget (and the size of the rig) will allow me to make changes large enough to even run A/C... but I will do the research to see what others have done towards that end.
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Old 09-25-2017, 05:57 AM   #11
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There may have been a posting delay because I see both of your posts.

My husband OP'd a thread called My Interstate Lithium Battery Adventures which tells a long story of how we (mostly he) chose and executed our lithium approach. There are schematics at the end.

I recommend that you think very carefully about what capacity you really need and for what reasons because it's an enormous amount of work and cost to DIY a transition to lithium. We had very specific reasons for doing our job.
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Old 09-25-2017, 07:23 AM   #12
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I bought a 2017 GT earlier this year, and have compared the specs to the 2018. I'm happy I have the 2017.
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Old 09-25-2017, 08:09 AM   #13
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A small correction on my comment... 2018 Tommy Bahama edition does have 300 watts solar panel setup... it was a typo on the website. I sent a note to Airstream and just got a reply confirming this. Cool!

Ha... and yes, now I see my posting.

Sorry yet again for another hi-jacking... I need to create my own thread with the several questions that I have instead of doing this...
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Old 09-25-2017, 09:17 AM   #14
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[QUOTE=wachuko;2012881]Do not know, others that do will sure chime in... I am waiting for delivery of mine... and I can't find the specs on the ones installed in the Interstate. As you mentioned, those are 2-12 VoltDeep Cycle Maintenance Free Group 24 AGM, but I can't find the Ah value on those...

The supplied batteries are 80AH each for a total of 160. If you replace these with two Lifeline 4CT's which are 6V you will wind up with 220AH. (37.5% increase). (you will need to wire these in series instead of parallel like the supplied batteries in order to get back to 12V). Then, if you add a 2nd tray with 2 more 4CT's you will have a total of 440AH. (In this case you would wire each bank in series then connect the two banks in parallel). That's a bunch of storage capacity and pretty cost effective. This battery bank combined with your 300W of Solar will provide a pretty decent system. One caveat, you should probably swap out the Atkinson charge controller for a more sophisticated one. Not a lot of money but will greatly improve your solar system.

BTW, when I upgraded mine to 6V, I sold my supplied batteries on Craigslist for $175.

Good Luck
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