Reply
 
Thread Tools Search this Thread Display Modes
 
Old 03-13-2019, 02:59 PM   #1
3 Rivet Member
 
2016 Interstate Grand Tour Ext
brookhaven , Georgia
Join Date: Jun 2016
Posts: 126
Four Batteries vs. Two

In my 2016 Interstate, I have the stock 2 batteries. I do have 300 watts of solar. Has anyone upgraded to the 4 battery system by adding the brackets, wires, and 2 additional batteries? I would have this done at the Mercedes/Airstream dealer. How has this affected performance with the amount of time the batteries last after sundown? Currently, I believe if I leave the fridge and freezer running overnight to around 9am, the batteries will be run down to the point of potential damage. Of course, the inverter and alarm and sub pull some current. The batteries are currently in perfect condition.

My wife and I are planning a west coast trip, and we have a pile of hotel points that we might use along the way in some places. I want to be able to park the vehicle overnight with the fridge and freezer running and not have to worry about batteries.

There are other times where I find myself in the middle of nowhere on a cool night and don't need AC or heat and would like to be able to just pull over without worry of battery capacity.

If you have installed this package through an Airstream dealer, what are you paying? If you have a new Interstate with 4 batteries, how is it performing?

thanks
__________________

coasttocoast is offline   Reply With Quote
Old 03-13-2019, 03:41 PM   #2
Rivet Master

 
2012 Avenue Coach
Corpus Christi , Texas
Join Date: Feb 2018
Posts: 795
I have seen previous posts of Interstate owners who have upgraded to 4 batteries. Unfortunately in a few cases, their added battery boxes did not hold up to the extra weight and dumped the extra AGMs on the roadway.

I'm sure they will be along shortly to advise you on how they liked the extra battery capacity and also how to make sure the are supported correctly.
.
__________________

rowiebowie is offline   Reply With Quote
Old 03-13-2019, 04:19 PM   #3
3 Rivet Member
 
2017 Interstate Lounge Ext
Plano , Texas
Join Date: Mar 2018
Posts: 213
Take a look at Wachuko’s “The journey begins thread” he did the work himself. Be warned your todo list grows the more pages you read on that thread.
As Rowiebowie mentioned others have seen mixed results with having the work done elsewhere. It seems like 400 watt solar and 4 AGM batteries plus controller upgrade allow you to be pretty self sufficient.
Tobbun is offline   Reply With Quote
Old 03-13-2019, 05:59 PM   #4
2 Rivet Member
 
2017 Interstate Grand Tour Ext
Western , Tennessee
Join Date: Sep 2017
Posts: 44
I have a 2017 Interstate. I added 2 additional 12 v batteries. With night time temps in the 70 - 80 range, I can run the frig over night. Can not run freezer and frig. I have used frig only several times when we will spend the night in a motel with no place to plug the Interstate.

No problem with brackets holding up. Those who talk of bracket failure have changed to 6 volt batteries. 6 volt batteries weigh more than 12 v batteries.

I install extra batteries with the Interstate parked in my driveway.
TN Princess is offline   Reply With Quote
Old 03-13-2019, 06:47 PM   #5
Prof. of Pending Projects
 
wachuko's Avatar
 
2018 Tommy Bahama Interstate
Orlando , Florida
Join Date: Sep 2017
Posts: 1,831
Correct. Those that had issues with their trays had heavier batteries installed.

If you do the install yourself, make sure you use stainless steel rivets to secure the trays. And go with stock size batteries.

Let me get you the direct link to where I started to do the install. Here you go:

http://www.airforums.com/forums/f240...ml#post2046122

I took several pages for this as I was also doing the BlueSea ACR and the Solar controller... so be ready to go over several pages... I should have created a separate thread documenting it but was lazy....

__________________
Safe travels!
Wachuko
WBCCI #26769
2018 Airstream Interstate 3500 Lounge EXT Tommy Bahama w/ARS
wachuko is online now   Reply With Quote
Old 03-13-2019, 07:24 PM   #6
Rivet Master
 
2014 Interstate Coach
Arroyo Grande & Central Point , California & Oregon
Join Date: Sep 2011
Posts: 605
My wife and I are planning a west coast trip, and we have a pile of hotel points that we might use along the way in some places. I want to be able to park the vehicle overnight with the fridge and freezer running and not have to worry about batteries.

On our 2014 AI Twin with interior batteries we changed to 6V AGM's and could easily leave it in a hotel parking lot overnight with the frige running. I believe you have seperate frige and freezer while we had an internal freezer in the frige. Not sure what your power draw would be but do keep in mind that you won't be accessing the frige overnight which help it stay cool. You might want to run a test in your driveway and see how it performs.

thanks[/QUOTE]
c21bill is offline   Reply With Quote
Old 03-13-2019, 07:37 PM   #7
DudleyD
 
2018 Interstate Grand Tour Ext
Victor , Idaho
Join Date: Jan 2018
Posts: 15
No sure where to start with this info. We removed the2-12V AGM batteries and replaced with 4- 6V AGM’s. We also added a solar panel to get to 400 watts. My wife and I have only plugged in once. We have had no issues with the test. Did about 8K miles last year. The work was done in Ohio by the factory.
I am getting a lesson on batteries. They need to be plugged in to restore to full charge.
__________________
Dudley
Jdurossjr is offline   Reply With Quote
Old 03-14-2019, 10:01 AM   #8
3 Rivet Member
 
2014 Interstate Ext. Coach
fairfax station , va
Join Date: Jan 2015
Posts: 176
Not a direct response to the OP but I added 2-12V AGM to the 2014.

They are safely inside and not under-slung. I also changed the embarrassingly anemic solar from 50w to 150w.

To be brutally honest, the new set up allows the small NovaKool to remain running all night and that's about it.

I could probably watch TV, if I watched TV or use the induction cooker or coffee maker for a short period.

Dreams of endless boondocking are, alas, still dreams.
VAtom is offline   Reply With Quote
Old 03-18-2019, 04:28 PM   #9
4 Rivet Member
 
2016 Interstate Grand Tour Ext
Houston , Texas
Join Date: Oct 2015
Posts: 310
Much information on the site on how to upgrade fro extended Boondocking. Here is a thread that was very active a while back.

http://www.airforums.com/forums/f240...ml#post1806655

I'm now looking at the Volta system and will be visiting an installer Wednesday to see what all is involved. If you follow the thread above, you will see I also changed to a MPPT Solar controller and it does make a difference. We have no problems with 24 - 36 hour runs with our tired 4 batteries.
Mcrider is offline   Reply With Quote
Old 03-18-2019, 08:26 PM   #10
2 Rivet Member
 
swilly43's Avatar
 
2016 Interstate Grand Tour Ext
escondido , California
Join Date: Nov 2017
Posts: 82
I am in the process of assembling the parts to perform an upgrade to 4 6V lifeline batteries in place of the 2 12V This will triple the available amp hours available to safely use the batteries. With the 2 GRP 24's you have 80 useable hours. With 4 6V lifelines you have 220 AH. Ok not quite 3 times. I purchased the OEM battery trays for the passenger side. I will remove the existing trays on the driver side. I will cut the trays in half and lap weld in 14 G steel to increase the width by .5 inch to accommodate the width of the 6V. I will use the Airstream specified or stainless steel rivets with as yet to be determined approach to secure the heavier batteries. Other posters have shown how to do this but I am looking at a different approach. The cost of the 2 battery trays was about $300. The cost to split all four trays, weld in a patch and paint is about $300. So for about $2K I can almost triple my AH's. I will post when I get it all done in about a month. I investigated a custom tray but this was turning out to be much more expensive and time consuming.
swilly43 is online now   Reply With Quote
Old 03-18-2019, 11:28 PM   #11
2 Rivet Member

 
2015 Interstate Ext. Coach
Thousand Oaks , California
Join Date: Aug 2017
Posts: 45
I used a different approach to adding the additional amp hours. In my case I removed the existing battery box which was under the back seat and converted the rear storage box to hold 4 X 6 volt Lifeline golf cart batteries (GPL-4CT). Phaeton313 had the initial idea. Here is the main thread:
http://www.airforums.com/forums/f240...es-172072.html
and this is a link to the completed installation in my van
http://www.airforums.com/forums/f240...ml#post2038448
I've been very happy with the extra capacity, 2+ days of boondocking.
Ryoungca is offline   Reply With Quote
Old 03-19-2019, 02:20 PM   #12
Rivet Master
 
Boxster1971's Avatar

 
2013 Interstate Coach
Fulton , Maryland
Join Date: May 2010
Posts: 3,040
Quote:
Originally Posted by swilly43 View Post
I am in the process of assembling the parts to perform an upgrade to 4 6V lifeline batteries in place of the 2 12V This will triple the available amp hours available to safely use the batteries. With the 2 GRP 24's you have 80 useable hours. With 4 6V lifelines you have 220 AH. Ok not quite 3 times. I purchased the OEM battery trays for the passenger side. I will remove the existing trays on the driver side. I will cut the trays in half and lap weld in 14 G steel to increase the width by .5 inch to accommodate the width of the 6V. I will use the Airstream specified or stainless steel rivets with as yet to be determined approach to secure the heavier batteries. Other posters have shown how to do this but I am looking at a different approach. The cost of the 2 battery trays was about $300. The cost to split all four trays, weld in a patch and paint is about $300. So for about $2K I can almost triple my AH's. I will post when I get it all done in about a month. I investigated a custom tray but this was turning out to be much more expensive and time consuming.

SWILLY43 - good choice of method to add more batteries.
__________________
- - Mike
--------------------------
2013 Airstream Interstate Lounge EXT
Boxster1971 is offline   Reply With Quote
Old 03-26-2019, 08:09 AM   #13
New Member
 
Jack Houpe's Avatar
 
2012 Interstate Coach
Gravette , Arkansas
Join Date: Apr 2018
Posts: 1
We installed an additional 4 T105 golf cart batteries in parallel to the 2 agm batteries, now we have 380 amp hour total. We don't boondock all that much but its nice to know we can go 3 days on the refrigorator without the voltage dropping below 12.2 volts. Had to build a air tight box with a vent to the original box which is vented outside. Works very well so far been over a year. Recently we converted to twin beds, here is a picture of the 2 boxes, both are black. Sorry about the picture being sideways.
Attached Thumbnails
Click image for larger version

Name:	0301191008_resized.jpg
Views:	66
Size:	186.4 KB
ID:	336593  
Jack Houpe is offline   Reply With Quote
Old 03-28-2019, 08:04 AM   #14
2 Rivet Member
 
AI Joe's Avatar
 
2016 Interstate Grand Tour Ext
Key Largo , Florida
Join Date: Feb 2016
Posts: 56
Images: 11
Blog Entries: 1
Hah Jackson Center install 4 6v Lifeline batteries to our 2016 GT in October 2017. Added 2 solar panels for 300w. Fall 2019 replaced the original Atkinson controller with their new “MPT” controller designed specifically for the Lifeline spec and can run fridge and freezer all day and end day with 100% batteries; so could theoretically run all night and be OK, but usually shut off freezer overnight and all is well. Check out the new Atkinson controller: contact abnerj@atkinsonel.com. It is a simple “plug & play” install that takes less than 2 hour. Also, check out the through the roof plug connection done by Airstream-had to hardwire on my 2016 as the original Airstream connection was very poorly thought out.
__________________

__________________
AI Joe
Remember: "it's even better in an Interstate!"
AI Joe is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
2 batteries outside and two batteries inside timmaah Electrical - Systems, Generators, Batteries & Solar 14 08-25-2011 07:18 AM
Two 12V vs. two six volt batteries spat61 Land Yacht/Legacy Motorhomes 37 04-22-2010 11:50 PM
Dropping out for a year: family of four (two toddlers) tpodonne Full-Timing 22 01-08-2010 10:37 PM
Four Wheel Drive or Two Wheel Tow Vehicle? 1cericks1 Tow Vehicles 24 02-01-2009 02:22 PM
Two 6 volts or Two 12V series 27 LI Pets Electrical - Systems, Generators, Batteries & Solar 0 09-07-2006 06:06 PM


Featured Campgrounds

Reviews provided by

Disclaimer:

This website is not affiliated with or endorsed by the Airstream, Inc. or any of its affiliates. Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 12:36 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.