Reply
 
Thread Tools Search this Thread Display Modes
 
Old 09-04-2006, 06:49 PM   #1
Rivet Master
 
1979 31' Excella 500
Detroit Area , Michigan
Join Date: Jul 2004
Posts: 498
Images: 43
How long should a battery last?

This spring I bought a new high Amperage, deep cycle battery for my rig. I was having problems with my furnace getting into lock-out mode where I'd catch it with the fan constantly on blowing cold air.

This weekend I had the kids with me up north and it was cold every night. Battery was charged up good every evening via generator and the thermostat was set.

The first night, the furnace ran fine through the night. The second and third nights the furnace still appeared to be working fine (not in lockout) and blowing hot air but the battery had been just about toasted by 4am. What could possibly cause such a quick decrease in battery performance? This battery used to run the furnace through the night no problem.
__________________

__________________
wacnstac is offline   Reply With Quote
Old 09-04-2006, 06:55 PM   #2
Site Team
 
, Minnesota
Join Date: Aug 2003
Posts: 6,940
Images: 59
These are typical symptoms of a sulfated battery. Take it to the dealer and have it checked. Google "sulfated battery" for a description of causes and cures.
__________________

__________________
markdoane is offline   Reply With Quote
Old 09-04-2006, 06:57 PM   #3
Well Preserved

 
1993 21' Sovereign
Colfax , North Carolina
Join Date: Jun 2003
Posts: 20,190
Are you sure it was fully charged? Did you check it with a hydrometer, or just by watching the amps charged? Also, if you run the battery almost dead, it will shorten the time it will last next time, and the shorter time will be even shorter the next time you run it down, which will get easier and easier to do, the more reserve capacity you remove from the battery by draining it.
It could also be that it is getting cooler at night, and the furnace fan is running more...Sometimes the simple answers are the ones we overlook.
__________________
Meddle not in the affairs of dragons, for you are crunchy, and taste good with ketchup.
Terry
overlander63 is offline   Reply With Quote
Old 09-04-2006, 08:08 PM   #4
Rivet Master
 
1979 31' Excella 500
Detroit Area , Michigan
Join Date: Jul 2004
Posts: 498
Images: 43
I don't know what you mean by sulfated but I'll look it up. I did check the water and it was still to the top.
__________________
wacnstac is offline   Reply With Quote
Old 09-04-2006, 08:14 PM   #5
Well Preserved

 
1993 21' Sovereign
Colfax , North Carolina
Join Date: Jun 2003
Posts: 20,190
Quote:
Originally Posted by wacnstac
I don't know what you mean by sulfated but I'll look it up. I did check the water and it was still to the top.
It's basically the same thing I said, only "sulfated" is what it's called. When the battery gets seriously discharged, the sulphur adheres to the plates, and when it is charged back up, not all the sulphur goes back into the suspension, it stays on the plates. Kind of like the filter in your home air conditioner, when it gets full of dust, not so much air moves through it, and when the sulphur sticks to the plates, not so many electrons flow through them. It's a bad analogy, but I think you get the idea.
__________________
Meddle not in the affairs of dragons, for you are crunchy, and taste good with ketchup.
Terry
overlander63 is offline   Reply With Quote
Old 09-04-2006, 08:27 PM   #6
Rivet Master
Commercial Member
 
lewster's Avatar
 
Vintage Kin Owner
Naples, FL , Hood River, OR
Join Date: Dec 2005
Posts: 7,279
Go AGM

If you have to replace your battery and you regularly put it thru such deep discharge cycles, you should consider using an AGM battery instead of a liquid type.

AGM stands for 'absorbed glass mat' ad contains no free liquid, is permanently sealed, can be drawn down to 20% on ocassion and usually has a higher amp-hour capacity. These benefits don't come cheaply, but they are the best battery for RV use!
__________________
Lew Farber...ABYC Certified Master Marine Electrician...RVIA Certified Master Tech ...AM Solar Authorized Installation Center...AIRSTREAM Solar & Electrical Specialist...Micro Air 'Easy Start' Sales and Installations
lewster is offline   Reply With Quote
Old 09-04-2006, 08:39 PM   #7
Rivet Master
 
1979 31' Excella 500
Detroit Area , Michigan
Join Date: Jul 2004
Posts: 498
Images: 43
Links to AGM batteries on the web? Can they be charged with the good old Univolt?
__________________
wacnstac is offline   Reply With Quote
Old 09-04-2006, 09:21 PM   #8
Site Team
 
, Minnesota
Join Date: Aug 2003
Posts: 6,940
Images: 59
If you don't want to upgrade to a good three stage charger, you could skip the AGM batteries and just buy a cheap deep cycle battery at Walmart each season. It's simple and you don't need to understand any electrochemistry or keep track of voltages and charge rates.
__________________
markdoane is offline   Reply With Quote
Old 09-04-2006, 09:38 PM   #9
2 Rivet Member
 
Darrell Root's Avatar
 
2004 28' International CCD
Camarillo , California
Join Date: May 2005
Posts: 91
Link

how long will a agm battery last
__________________
Darrell Root is offline   Reply With Quote
Old 09-04-2006, 10:51 PM   #10
Rivet Master
 
2006 30' Classic
Farmington , New Mexico
Join Date: Feb 2005
Posts: 822
Images: 14
It sounds to me like it was never fully charged after each use. Pieman
__________________
Mike Lewis is offline   Reply With Quote
Old 09-04-2006, 10:58 PM   #11
Rivet Master
Commercial Member
 
lewster's Avatar
 
Vintage Kin Owner
Naples, FL , Hood River, OR
Join Date: Dec 2005
Posts: 7,279
www.lifelinebatteries.com

Depending on use, 3-5 years. Regular wet cell batteries lose 30-40% of their charge each month while disconnected due to the high internal resistance found in them. AGM's lose only 2-3% of their charge each month while disconnected. You won't have to charge them but once every 3 months (or longer).

A group-24 AGM will provide 149 minutes of discharge at 25 amps, group 27 = 186 minutes. For a twin battery set-up in parallel, double these numbers. But look at this: if you use 2-6 volt AGM golf cart batteries in series you get a whopping 492 minutes of discharge at 25 amps and as a side benefit, get many more charge/discharge cycles than with a 12V battery= longer lasting!!

If you do a lot of serious boondocking and don't want a generator to recharge the batteries, the 6V pair is the way to go!
__________________
Lew Farber...ABYC Certified Master Marine Electrician...RVIA Certified Master Tech ...AM Solar Authorized Installation Center...AIRSTREAM Solar & Electrical Specialist...Micro Air 'Easy Start' Sales and Installations
lewster is offline   Reply With Quote
Old 09-04-2006, 11:06 PM   #12
2 Rivet Member
 
Darrell Root's Avatar
 
2004 28' International CCD
Camarillo , California
Join Date: May 2005
Posts: 91
link

Lewster, does the same hold true for walmart deep cycle 6 volt wired in series ,just not as lng lasting. Also Walmart deep cycles are about 1/3 the cost of glass matt makeing the cost about the same , Darrell
__________________
Darrell Root is offline   Reply With Quote
Old 09-04-2006, 11:17 PM   #13
_
 
. , .
Join Date: Dec 2004
Posts: 8,812
here is a link to the lifeline agm batteries...

oh wait lew already supplied this info...oh well...

these are currently used by a/s IF solar equipped or 'agm' option is selected.

http://www.lifelinebatteries.com/rvcomps.php

also check out the graph and faqs and specific battery models/specs....

mine are the 100amp, model gpl 27t....65lbs each.

and shoe horned into the boxes....

supposed to be good for 1000 charges and higher charge/discharge rates and faster recharging...than gel cells.

cheers
2air'
__________________
all of the true things that i am about to tell you are shameless lies. l.b.j.

we are here on earth to fart around. don't let anybody tell you any different. k.v.
2airishuman is offline   Reply With Quote
Old 09-05-2006, 08:24 AM   #14
Rivet Master
 
1979 31' Excella 500
Detroit Area , Michigan
Join Date: Jul 2004
Posts: 498
Images: 43
1. If I hook two AGM batteries in series will they fit into the standard battery compartment.

2. Can I use the univolt with a generator to charge them (I am always permanently boondocking).

One more question, how long does it generally take a Univolt to recharge a battery after it has been drawn down to say 1/4 on the control panel?
__________________

__________________
wacnstac 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
battery charger ALANSD Batteries, Univolts, Converters & Inverters 8 09-16-2007 06:52 PM
Second Battery w9det 1999 Safari 5 12-06-2002 07:42 PM
Battery lock Pahaska Our Community 8 11-23-2002 11:45 AM
Plastic battery boxes ! 77caravaner Electrical - Systems, Generators, Batteries & Solar 1 10-07-2002 01:57 PM
Battery Storage JAG Electrical - Systems, Generators, Batteries & Solar 2 07-05-2002 03:06 PM


Virginia Campgrounds

Reviews provided by




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 03:36 PM.


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.