Go Back   iRV2 Forums > MOTORHOME FORUMS > Class A Motorhome Discussions
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 09-26-2014, 07:49 PM   #1
Senior Member
 
Damon Owners Club
Ford Super Duty Owner
Join Date: Apr 2008
Location: NAS Pensacola, FL
Posts: 329
Unique type of Battery Failure

Old Navy submariner electrician here that has been traveling cross-country. This developed on this trip, the coach sometimes started on the chassis battery some times not. The aux start would get the coach started sometimes. Running the generator and powering the battery systems with the converter would always start the coach. Did all the normal things: cleaned battery terminals and all of the connectors in between the chassis battery and the starter solenoid. Still did not fix the problem. Pulled out the handy-dandy battery charger and charged the battery directly overnight. Open circuit battery voltage was 13.2VDC after charge, specific gravity was about 1.275 all cells. Still would start the coach with out some help. At my wits end, I drove the coach to Autozone (battery was an Duralast 65) and removed the battery to have it shop tested. Lo-and-behold, the battery tested fully charged and and voltage at 13.2vdc, but the load test determined the battery was bad. Replaced the battery and was on my way. I think the problem may have been a broken seperator or failed grid, not sure. I'm sure somebody will have some opinion as to what failed.

The reason I'm sharing this is that all the tests I conducted on the battery showed the battery good, but the load test was the definitive test to determine the true condition of the battery. JM2...
__________________

__________________
Ted Fulltiming in the DreamCatcher a
2008 Challenger 371PE on F53 w/ 2010 Cobalt
R'V there yet?
teddyu is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 09-26-2014, 08:12 PM   #2
Senior Member
 
Skip426's Avatar


 
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 14,970
[QUOTE=teddyu;2245185. I think the problem may have been a broken seperator or failed grid, not sure. I'm sure somebody will have some opinion as to what failed.

The reason I'm sharing this is that all the tests I conducted on the battery showed the battery good, but the load test was the definitive test to determine the true condition of the battery. JM2...[/QUOTE]


X2, if it hasn't been load tested , it can't be ruled out as the problem.
A volt meter is not a load.
__________________

__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
Skip426 is offline   Reply With Quote
Old 09-26-2014, 08:45 PM   #3
Senior Member
 
Bfmorgan's Avatar
 
Monaco Owners Club
Join Date: Mar 2013
Location: Northern United States
Posts: 270
The failure you experienced is not an unusual failure. Most batteries will reach a point where they are able to provide a reasonable voltage, but the voltage will drop drastically as soon as you apply a load. Harbor Freight will put a battery tester that puts a 100 amp load on the battery on sale for around $18-$20.
__________________
Brad & Bonnie
2007 Monaco Dynasty 42 Diamond
Bfmorgan is offline   Reply With Quote
Old 09-27-2014, 06:40 AM   #4
Senior Member
 
IMDSailor's Avatar


 
Thor Owners Club
Workhorse Chassis Owner
Join Date: Sep 2011
Location: Halifax, Nova Scotia, Canada
Posts: 871
Can you load test 6v batteries individually or do they have to be in pairs to make 12v?

Thanks


Sent from my iPhone using iRV2 - RV Forum
__________________
Stewart & Kim. 2011 Serrano 31V, MaxForce 7 w/ Allison 6 Sp. Fiat 500 Sport Diesel Pusher.
Surge Guard 3450, TST 510, Sliverleaf VMSpc, RVND 7710. Blue Ox Tow. 2010 Arctic Cat 700 TRV.
Someday your life may flash before your eyes. Make sure it's worth watching.
IMDSailor is offline   Reply With Quote
Old 09-27-2014, 07:07 AM   #5
Senior Member


 
Join Date: Aug 2011
Posts: 3,277
I guess that depends upon if you have a 6 volt capable load tester ...... they exist since most golf cars run on a bank of 6 volt batteries. (Some golf carts use 8 volt batteries too)
__________________
pasdad1 is offline   Reply With Quote
Old 09-27-2014, 07:21 AM   #6
Senior Member
 
Join Date: Sep 2012
Posts: 4,232
Good reminder that batteries commonly can have a good surface charge, but under load are shot.
__________________
jesilvas is offline   Reply With Quote
Old 09-27-2014, 08:13 AM   #7
Senior Member
 
OLYLEN's Avatar
 
Monaco Owners Club
Join Date: Jan 2008
Location: Olympia, Wa
Posts: 2,329
Another tip is if in the fall as the weather runs cooler the vehicle just doesn't sound like it is turning over quite normal. Have the battery tested, the cool temps show batteries going bad before a total failure.

LEN
__________________
2004 Clss C 31' Winnebgo
OLYLEN is offline   Reply With Quote
Old 09-27-2014, 10:08 AM   #8
Senior Member
 
Join Date: Feb 2010
Posts: 4,492
Battery was degraded or sulfated.

Imagine a class of water as a battery.

Make a line and fill with water.

Water is your charge capacity and the line represents the

Pour this water into a mesuring cup.

Now place a bunch of rocks or gravel in glass.

Now pour water from measuring cup back into gravel filled glass until it is at same line and observe volume still in measuring cup.

The charge voltage is still the same but there is a lot less charge in the battery as seen by water in measuring cup.

The gravel represents sukfation or degradation of the typical lead acid battery.

All of them do it over time.

And voltmeter or specific gravity measurements will not usually indicate it but the test you have performed by filling with water represents a load test where you can place a load on charged battery and see how it preforms.

Simple...?
__________________
Tony & Lori
1989 Country Coach Savannah SE
TQ60 is offline   Reply With Quote
Old 09-27-2014, 10:13 AM   #9
Senior Member
 
IMDSailor's Avatar


 
Thor Owners Club
Workhorse Chassis Owner
Join Date: Sep 2011
Location: Halifax, Nova Scotia, Canada
Posts: 871
Quote:
Originally Posted by TQ60 View Post
Battery was degraded or sulfated.

Imagine a class of water as a battery.

Make a line and fill with water.

Water is your charge capacity and the line represents the

Pour this water into a mesuring cup.

Now place a bunch of rocks or gravel in glass.

Now pour water from measuring cup back into gravel filled glass until it is at same line and observe volume still in measuring cup.

The charge voltage is still the same but there is a lot less charge in the battery as seen by water in measuring cup.

The gravel represents sukfation or degradation of the typical lead acid battery.

All of them do it over time.

And voltmeter or specific gravity measurements will not usually indicate it but the test you have performed by filling with water represents a load test where you can place a load on charged battery and see how it preforms.

Simple...?

The specific gravity checks as does the SoC. I'll get a load tester.


Sent from my iPhone using iRV2 - RV Forum
__________________
Stewart & Kim. 2011 Serrano 31V, MaxForce 7 w/ Allison 6 Sp. Fiat 500 Sport Diesel Pusher.
Surge Guard 3450, TST 510, Sliverleaf VMSpc, RVND 7710. Blue Ox Tow. 2010 Arctic Cat 700 TRV.
Someday your life may flash before your eyes. Make sure it's worth watching.
IMDSailor is offline   Reply With Quote
Old 09-27-2014, 10:24 AM   #10
Senior Member
 
Join Date: Feb 2010
Posts: 4,492
Also note that your microwave is a great load tester...for coach batteries.

Best to do with fresh batteries then repeat later to confirm performance.

Get bowl of water large enough for 5 minutes of use.

Make sure batteries fully charged...float charged a day or three.

Turn everything off then turn on inverter and measure battery voltage.

Place water in microwave on high for 5 minutes and recheck voltage when finished.

Record this time in your log book.

The voltage will drop a bit over time but when the voltage drops a bunch more than before then battery is starting to fail.

The key here is repeatability. ..always full charge on battery and same setup process with same time so the test is same every time.

When the results change the battery is causing said change.
__________________
Tony & Lori
1989 Country Coach Savannah SE
TQ60 is offline   Reply With Quote
Old 09-27-2014, 10:29 AM   #11
Senior Member
 
wa8yxm's Avatar
 
Damon Owners Club
Workhorse Chassis Owner
Join Date: Mar 2009
Posts: 22,790
As Lead acid batteries age sulfate builds up on the plates,, So long as any part of the plate is in contact with the electrolyte (Acid/water mix) the battery will charge and show as charged. But as the sulfate builds up on the plates the "internal resistance" of the battery (actually the quotes are not needed as that is what it is called) increases, thus the cranking amps start to resemble a rock in free fall (GOING DOWN They are).

This, is not a weird battery failure,, It is in fact the most common battery failure. Some chargers have a "Desulfate" mode, this is supposed to delay this type of failure.. Also Equalization may delay it.

Key word is DELAY, however.
__________________

__________________
Home is where I park it!
wa8yxm is offline   Reply With Quote
Reply

Tags
battery



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
Large power draw on chassis battery '94 Kountry Star omegacanuck Newmar Owner's Forum 54 01-31-2016 09:22 PM
2012 Thor Ace 29.1 Chassis Battery ThorEvo1029 Thor Industries Owner's Forum 5 05-22-2014 09:51 PM
My Aux Start Battery Switch Is Not Working Yellowboat Winnebago Industries Owner's Forum 14 04-06-2014 09:01 AM
Alternator failure bgj6905 Cummins Engines 12 03-12-2014 02:15 PM

» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 02:47 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.