Reply
 
Thread Tools Search this Thread Display Modes
 
Old 08-05-2015, 04:45 PM   #1
2 Rivet Member
 
tlundell's Avatar
 
2015 Interstate Ext. Coach
Los Gatos , California
Join Date: Sep 2014
Posts: 63
Still Another House Battery Maintenance Question

I know there have been a number of threads regarding house battery maintenance and I apologize if one has addressed my specific questions.. I have a 2015 Interstate Grand Tour which, due to space limitations at home, I store at an indoor facility off-site. Unfortunately, the storage facility is not able to provide shore power for all of the 100+ RV's stored there, so my AI is without a power source (including solar) for two weeks or so at a time between our trips. Of course, I shut off the main power switch when it goes in, but I do understand that there are several vampires drawing down on the batteries. My questions are: 1) is it feasible to install an easily accessible battery disconnect (like the "kill switch" sometimes used as an anti-theft device on autos)?, and 2) is their consequence or damage to the AI having no house power for weeks at a time? Thanks for your thoughts.
__________________

__________________
Tim
2015 Interstate Grand Tour
WBCCI Member #5506
tlundell is offline   Reply With Quote
Old 08-05-2015, 05:11 PM   #2
Rivet Master
 
Ron_CA's Avatar
 
2015 Interstate Ext. Coach
San Diego , California
Join Date: Feb 2014
Posts: 665
I am not sure that you will be able to eliminate all electrical draws. I think it will damage your house batteries without being connected for 2 weeks.
__________________

__________________
Ron_CA is offline   Reply With Quote
Old 08-05-2015, 06:06 PM   #3
Figment of My Imagination
 
Protagonist's Avatar
 
2012 Interstate Coach
From All Over , More Than Anywhere Else
Join Date: Dec 2011
Posts: 10,317
One draw that you cannot shut off is the BIM. It has to be powered all the time, monitoring the charge states of the house and chassis systems, so that it can tell whether to connect or disconnect them from each other.
__________________
WBCCI #1105
TAC LA-4

My Google-Fu is strong today.
Protagonist is offline   Reply With Quote
Old 08-05-2015, 06:31 PM   #4
Rivet Master
 
Currently Looking...
Mission , Texas
Join Date: Jun 2015
Posts: 836
Only two weeks with no charging? Why is that a concern? A disconnect at the battery terminal will eliminate any draw on the battery (effectively it would not be hooked up to anything).
__________________
nrgtrakr is offline   Reply With Quote
Old 08-05-2015, 06:38 PM   #5
2 Rivet Member
 
tlundell's Avatar
 
2015 Interstate Ext. Coach
Los Gatos , California
Join Date: Sep 2014
Posts: 63
I guess the ultimate question, then, is whether the storage situation I describe is destined inevitably to ruin the batteries, given the apparent consensus from other threads that an "unplugged" AI will quite quickly run the batteries down to zero without some other source of power (i.e., solar, generator, engine running, etc). Is that correct?
__________________
Tim
2015 Interstate Grand Tour
WBCCI Member #5506
tlundell is offline   Reply With Quote
Old 08-05-2015, 06:49 PM   #6
Rivet Master
 
Currently Looking...
Mission , Texas
Join Date: Jun 2015
Posts: 836
How does a disconnected battery discharge? I would love to know.

When I left the USA for an overseas assignment, my Father offered to let me store my car at his place since it had very few miles. He put it up on blocks, started it, poured oil down the carburator until it choked, disconnected the battery and covered the tires.

The original assignment of 2 years ended up being 6. When I got home, I gave it a tune up, checked the battery with a hydrometer, topped off the battery water (the plates were still submerged) and it started right up.

Maybe I'm magic ...
__________________
nrgtrakr is offline   Reply With Quote
Old 08-05-2015, 07:08 PM   #7
Figment of My Imagination
 
Protagonist's Avatar
 
2012 Interstate Coach
From All Over , More Than Anywhere Else
Join Date: Dec 2011
Posts: 10,317
Quote:
Originally Posted by nrgtrakr View Post
Only two weeks with no charging? Why is that a concern? A disconnect at the battery terminal will eliminate any draw on the battery (effectively it would not be hooked up to anything).
If it was a trailer where the battery box is readily accessible, that would be fine. But in an Interstate with rear sofa, all but a few require you to disassemble the sofa to reach the batteries (not kidding, you have to take it apart before you can even open the battery box). And to make it more fun, the electricity has to work in order to disassemble the sofa, because you can't recline it without power, and you have to recline it halfway through the process in order to unbolt the seat bottom. And as others have noted, there are components that wouldn't like being disconnected, including anything with a computer chip and volatile memory.
Quote:
Originally Posted by nrgtrakr View Post
How does a disconnected battery discharge? I would love to know.
All batteries self-discharge. The best 12v batteries only discharge about 2% per month, but 5% per month is more typical. As long as batteries depend on a chemical reaction, they'll always self-discharge; you can't turn chemical reactions on and off with a switch.
__________________
WBCCI #1105
TAC LA-4

My Google-Fu is strong today.
Protagonist is offline   Reply With Quote
Old 08-05-2015, 07:13 PM   #8
2 Rivet Member
 
tlundell's Avatar
 
2015 Interstate Ext. Coach
Los Gatos , California
Join Date: Sep 2014
Posts: 63
[responding to ngrtrakr] No, the consensus seems to be that there are enough draws on the house batteries, even with the "house power" switched off that the batteries are going to be drawn down below the recommended minimum voltage in a matter of days without some source of charging power. That was the basis for my original question about effecting a total disconnect of the battery, as ngrtrakr describes. Manually disconnecting the house batteries (by pulling one of the leads off the terminal, for example) is not practical in an AI as the battery compartment is not easily accessible. Therefor the question about a "kill switch" or inline disconnect.
__________________
Tim
2015 Interstate Grand Tour
WBCCI Member #5506
tlundell is offline   Reply With Quote
Old 08-05-2015, 07:28 PM   #9
3 Rivet Member
 
2005 22' Interstate
Pittsburgh , Pennsylvania
Join Date: Mar 2005
Posts: 177
Just get one of these:



https://www.bluesea.com/products/770..._-_12V_DC_500A

and connect it between the positive battery terminal an everything else. This will totally isolate your battery and can be controlled from anywhere in the coach. It draws no power whether off or on. Your battery will last many, many months.
__________________
Formerly: 2005 Airstream Interstate (2500 T1N)
Now: 2014 Great West Vans Legend SE (3500 NCV3)
avanti is offline   Reply With Quote
Old 08-05-2015, 07:47 PM   #10
Rivet Master
 
Currently Looking...
Mission , Texas
Join Date: Jun 2015
Posts: 836
Quote:
Originally Posted by avanti View Post
Just get one of these:



https://www.bluesea.com/products/770..._-_12V_DC_500A

and connect it between the positive battery terminal an everything else. This will totally isolate your battery and can be controlled from anywhere in the coach. It draws no power whether off or on. Your battery will last many, many months.

There ya go ...
__________________
nrgtrakr is offline   Reply With Quote
Old 08-05-2015, 08:02 PM   #11
Rivet Master
 
73shark's Avatar
 
2011 Interstate Coach
Overland Park , Kansas
Join Date: Aug 2011
Posts: 2,748
Quote:
Originally Posted by avanti View Post

It draws no power whether off or on.
What size batteries does it use then?
__________________
Glass half full or half empty to an engineer is the glass is twice as big as it needs to be.

PM me for sale info on my 2011. SOLD!
Upfitted Transit 350 sitting in driveway.
73shark is offline   Reply With Quote
Old 08-05-2015, 08:03 PM   #12
Rivet Master
 
Currently Looking...
Mission , Texas
Join Date: Jun 2015
Posts: 836
Protagonist, having never experienced it before and on your comment I went looking ... it appears that even some of the greatest minds of science do not fully understand the battery self discharge effect.
__________________
nrgtrakr is offline   Reply With Quote
Old 08-05-2015, 08:56 PM   #13
3 Rivet Member
 
2006 22' Interstate
Sebastopol , California
Join Date: Feb 2013
Posts: 157
Would 2 battery disconnects work? One for the house, the other for the chassis thus totally isolating the BIM? Sort of a poor man's "bluesea"
__________________
Sebtown is offline   Reply With Quote
Old 08-05-2015, 10:52 PM   #14
4 Rivet Member
 
2013 Interstate Coach
Raymond , Iowa
Join Date: Jun 2014
Posts: 391
Batteries are not as hard to get to as Protegonist says on newer lounge models - can open the compartment from the rear. But still not fun and easy to do a total disconnect. I have put a second disconnect switch - on the large + cable going to the Magnum. So after switching the two house battery switchs 'off' and disconnecting the chassis battery at the accelerator pedal, all that is left (I think) is the BIM and solar controller. Not sure how much each of them draws. I would put a kill switch on each of them too - if I knew for sure which wires to put them on.
__________________

__________________
Titus 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
Still new, still starting Bullit Member Introductions 25 04-25-2014 07:36 PM
House Battery charging question dgmelp General Motorhome Topics 7 01-12-2012 09:05 PM
Battery Maintenance Question pappy19 Batteries, Univolts, Converters & Inverters 5 03-31-2011 10:14 PM
Cold weather battery bank maintenance Boondocker Generators & Solar Power 16 12-22-2007 11:23 PM
Still no House Power Alumi-Naught Classic Motorhomes 6 12-10-2006 08:21 PM


Virginia Campgrounds

Reviews provided by




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 07:18 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.

Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.