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11-28-2015, 02:30 PM
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#1
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Senior Member
Newmar Owners Club
Join Date: Apr 2003
Location: Brooklyn Park, MN USA
Posts: 102
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Batteries charge drops fast!
Guys:
Batteries show full charge on monitor panel and 100% on inverter panel, but within several minutes of furnace blower being on, charge drops to 60% charged!
Is this normal?
After studying off furnace, charge returns to full within minutes.
Is there an issue?
Advise.
__________________
2004 Newmar Dutch Star Model 4010
Spartan MM, Cummins 370 ISL, BO Adventa, Apollo Brake, 2014 Honda CRV EEZ TPMS
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11-28-2015, 02:37 PM
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#2
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Senior Member
Join Date: Sep 2012
Posts: 8,055
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If it comes back up it sounds more like a high resistance connection than the battery dropping.
I would be looking at the voltage at the center post of the batteries and at the outside of the connector to the post. Better might be measuring the voltage from the center of the post to the outside of the connector and to each side of the big disconnect relay. If you measure more than a couple tenths of a volt clean the contacts and check the cables.
BTW that is a good trick for checking connections. Measure from the stud feeding the power to the system to each point in the chain when under load. Any bad connection will have a measurable voltage drop.
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11-28-2015, 04:52 PM
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#3
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Moderator Emeritus
Join Date: Jan 2000
Location: West Palm Beach, FL. USA
Posts: 27,563
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That's the symptom of an all-but-dead battery. Have you checked/added distilled water to the cells lately? An otherwise ok battery will act like that if low on electrolyte.
__________________
Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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11-28-2015, 05:18 PM
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#4
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Senior Member
Join Date: Nov 2005
Posts: 7,396
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Agree with previous inputs--if bats draw down but then recover, could be bats or connections. If bats stay up [50-60%soc] thru the night with furnace use--tend to think its a connection; if bats die quickly with routine furnace use, it might be the bats. You didnt mention number of bats or their age, or what else might be drawing 12v amps at the same time but bad connections or old bats are two possible causes.
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Old Scout
2015 IH45 Foretravel
2003 Alpine 40' MDTS [Sold]
New Braunfels, Texas
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11-28-2015, 06:46 PM
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#5
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Senior Member
Newmar Owners Club
Join Date: Apr 2003
Location: Brooklyn Park, MN USA
Posts: 102
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Added Distilled water just about 3 weeks ago. Batteries are also quite new?
__________________
2004 Newmar Dutch Star Model 4010
Spartan MM, Cummins 370 ISL, BO Adventa, Apollo Brake, 2014 Honda CRV EEZ TPMS
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11-28-2015, 07:09 PM
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#6
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Senior Member
Join Date: Feb 2010
Posts: 4,654
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With load on and your indicator showing a low charge get your volt meter and measure battery voltage center of post to center of post.
If it reads low charge or same as indicator than battery issue.
If it reads full then connection issue.
Next measure center of post to terminal and that should read zero.
Report what you find.
Next measure gender of positive post to a shiny spot.
__________________
Tony & Lori
1989 Country Coach Savannah SE
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11-28-2015, 09:23 PM
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#7
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Senior Member
Winnebago Owners Club Freightliner Owners Club
Join Date: Oct 2009
Location: E WA or S TX
Posts: 4,049
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Quote:
Originally Posted by TQ60
With load on and your indicator showing a low charge get your volt meter and measure battery voltage center of post to center of post.
If it reads low charge or same as indicator than battery issue.
If it reads full then connection issue.
Next measure center of post to terminal and that should read zero.
Report what you find.
Next measure gender of positive post to a shiny spot.
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Good advice on the testing, but what does the sex of the post have to do with it? lol
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04 Horizon QD, 12 Ford Flex, Excalibar, Brakemaster, Winter Texan, RVin! since 1974
Norm, Donna & Tinker Kat(RIP) 01 Z3
Life is a Timed Event, you only get One Go Around!
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11-29-2015, 05:42 AM
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#8
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Senior Member
Join Date: Nov 2007
Location: Wasilla Alaska
Posts: 284
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I just posted this link to a similar topic on the Class A MH section. Lots of information here on how to test and maintain your batteries. Batteries are not cheap and it's a good idea to know as much as possible to maintain them properly.
Pacific Power Batteries - About Automotive Batteries
__________________
John and Karen
2012 Thor Challenger 36FD
2013 Fiat 500 Toad
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