Reply
 
Thread Tools Display Modes
Old 08-17-2010, 07:00 PM   #1
Senior Member
 
Adony's Avatar
 
Join Date: May 2010
Posts: 216
Battery Power - what can I expect??

Please excuse if this is a duplicate... I have a new T25KS travel Trailer that came with 2 new 12v batteries. We last used the TT at the end of July and when put away the batteries were fully charged. Since then I have cycled the slide several times, used a couple of interior lights for brief periods and listened to the Stereo. Today I went to do some work and everything was totally dead. I hooked up my Yahama 2000 generator and then proceeded to see if anything came on that might have been left on accidentally.. Nothing.. The radio was dead so I had to pull the fuse and reinsert it to get the radio going (Problem was it left on?).. All lights, fans, 12 antenna amp, were off. water pump was off.. that only leaves the LP Detector (which is always on) and the thermostat which was in the heat position (although it would never come on as the gas was off).. Is this normal battery decay in 2/3 weeks? If not any ideas what could be causing my either real or perceived problem? Can I remove all the 12 v fuses in the power panel and measure current draw across the respective contacts for each circuit to see if one is drawing more than it should.. they all should be 0 except the stereo and LP detector. Any ideas or suggestions on how to isolate or correct this issue will be immediately investigated as I want to use the trailer next week.
__________________

__________________
Adony is offline   Reply With Quote
Old 08-17-2010, 07:21 PM   #2
Site Team - Lou
 
Herk7769's Avatar
 
Join Date: Oct 2009
Location: South Eastern PA
Posts: 21,169
If the 2 new batteries were Dekka DC-24's they are rated at 75 amp hours each. Hooked in parallel, that amounts to 150 amp hours of available power.

Amp/Hour rating of battery capacity is calculated by multiplying the current (in amperes) by time (in hours) the current is drawn. For example: A battery which can deliver 4 amperes for 20 hours before being discharged would have a 80 amp-hour battery rating (4 X 20= 80).

The stereo pulls about 2 amps and the various other "always on" stuff pulls about an amp. This would kill both your batteries in about 4 days assuming they were full when you left the rig..

Using the slides most likely left the batteries in a "less than full" state.

As the voltage dropped, the radio (like any computer running on low voltage) most likely locked up and needed a "hard reset."
__________________

__________________

Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW
Herk7769 is offline   Reply With Quote
Old 08-17-2010, 07:28 PM   #3
Moderator Emeritus
 
Join Date: Nov 2008
Location: Winston-Salem, NC
Posts: 2,381
When you last used the trailer, did you have shore power or did you dry camp? How do you know the batteries were fully charged when you put it away? How many times have you cycled the slides, "several", is not an answer here. How was the refer left, on gas or auto? The radio will take power when off. Just because there isn't any gas, if it is cold enough for the thermostat to call for heat, it will still try to start the furnace. Still have a lot of details to work out. You're going to need a voltmeter and know how to use it.
__________________
LadyWindrider
2012 Ford F250 ext. Cab 4x4
2002 Jeep Wrangler Sahara
2008 Yamaha V-Star 650 Classic

2008 Work and Play 18LT
LadyWindrider is offline   Reply With Quote
Old 08-17-2010, 09:29 PM   #4
Senior Member
 
Adony's Avatar
 
Join Date: May 2010
Posts: 216
Answers to questions...

When you last used the trailer, did you have shore power or did you dry camp? we were on shore power for 3 days along with driving home connected to the trucks 12v system. How do you know the batteries were fully charged when you put it away? status meter (battery) read full How many times have you cycled the slides, "several", is not an answer here. Slide (1) was cycled 3 times. How was the refer left, on gas or auto? refer was off The radio will take power when off. Understood.. Just because there isn't any gas, if it is cold enough for the thermostat to call for heat, it will still try to start the furnace. This could have been the culprit, Still have a lot of details to work out. You're going to need a voltmeter Have several and know how to use it. 30 years experience with volt meter.. Maybe a battery disconnect switch is the answer...
__________________
Adony is offline   Reply With Quote
Old 08-17-2010, 10:55 PM   #5
Moderator Emeritus
 
Join Date: Nov 2008
Location: Winston-Salem, NC
Posts: 2,381
Thanks for the answers. the slide is the culprit, maybe. For my refer to be off, it has to be in OFF, not in auto. Also when on shore power, you need to check the battery voltage with a meter and make sure the converter is charging. Might also want to check it with tow vehicle hooked up, to make sure it charges batteries also. Also check the brake "break-away" switch and make sure you didn't accidentally pull it when disconnecting. Lastly, never believe the on board battery "status" meter. Most will show full at 12 volts, when in fact that is about 80 % charge.
__________________
LadyWindrider
2012 Ford F250 ext. Cab 4x4
2002 Jeep Wrangler Sahara
2008 Yamaha V-Star 650 Classic

2008 Work and Play 18LT
LadyWindrider is offline   Reply With Quote
Old 08-17-2010, 11:07 PM   #6
Junior Member
 
chris t's Avatar
 
Join Date: Aug 2010
Location: Rio Rancho, NM
Posts: 8
I have also seen other parasitic loads (like the gas detector) suck a battery dry when it's partially discharged. The timeframe that you're looking at, that would be an assistant culprit. The disconnect is a good idea, although I just open the battery box and disconnect the + cable. I'm cheap.
Ct..
__________________
Chris and Michaela
Webmaster - TrailManor Owners Forum
www.trailmanorowners.com
2011 Rockwood 3065WS
2010 Toyota Tundra Limited 4x4 5.7 with Air-Lift air bags and Firestone Compressor system.
chris t is offline   Reply With Quote
Old 08-17-2010, 11:07 PM   #7
Senior Member
 
Adony's Avatar
 
Join Date: May 2010
Posts: 216
More Info

Thanks for the answers. the slide is the culprit, maybe. For my refer to be off, it has to be in OFF, not in auto. I believe it was in the off position.. Also when on shore power, you need to check the battery voltage with a meter will do in morning and make sure the converter is charging the converter must be charging as after running the unit on my generator for several hours and then disconnecting it, my batteries now have power for the lights / limited slide action.. more charging will be done tomorrow... . Might also want to check it with tow vehicle hooked up, to make sure it charges batteries also. 12 vdc available at proper pin on truck connector.. Also check the brake "break-away" switch and make sure you didn't accidentally pull it when disconnecting MUST CHECK THIS AS IT IS A REAL POSSIBILITY. Lastly, never believe the on board battery "status" meter. Most will show full at 12 volts, when in fact that is about 80 % charge.. Thanks for the help... will know more tomorrow after checking above items...
__________________
Adony is offline   Reply With Quote
Old 08-18-2010, 07:09 AM   #8
Site Team - Lou
 
Herk7769's Avatar
 
Join Date: Oct 2009
Location: South Eastern PA
Posts: 21,169
Quote:
Originally Posted by chris t View Post
I have also seen other parasitic loads (like the gas detector) suck a battery dry when it's partially discharged. The timeframe that you're looking at, that would be an assistant culprit. The disconnect is a good idea, although I just open the battery box and disconnect the + cable. I'm cheap.
Ct..
Disconnecting the ground wire is just as effective and safer in my opinion.

Adony, I believe everything is working correctly with your system. The meter on the the KIB Micro Monitor will read full as long as the voltage is about 13 volts or more. I used to use it as a "Charging/topped off" indicator.

The remote display on the TM-2025 battery monitor is now my primary indicator. When my battery disconnect switch is in the OFF position the TM-2025 still reads battery voltage and you can see it drop over time simply from internal reststance in the battery itself.
__________________

Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW
Herk7769 is offline   Reply With Quote
Old 08-18-2010, 08:02 AM   #9
Site Team
 
KyDan's Avatar
 
Join Date: Mar 2008
Location: Louisville, KY
Posts: 6,732
Quote:
Originally Posted by Adony View Post
Maybe a battery disconnect switch is the answer...
BINGO! Your power center charger itself will gradually
suck down your batteries. Also the LP detector as you
said. I have added a battery disconnect switch to each
of my trailers. This has been discussed here many times.
It's a fairly easy job. I put mine in the toe kick area
below my kitchen cabinet right next to the power center.
It's a 1 or 2 beer job easy!

You can pull fuses one at a time and use a multi meter
set to read Amps. The meter should be capable of reading
a couple amps without frying the
meter! When you place the meter probes across the
fuse terminals (with the fuse removed) you will
see the current going to that device. I found current
going to my on board battery charger (power center)
as well as my LP detector.

Several of us here have used battery switches similar to
this one--
Amazon.com: 9001e e-Series Battery Switch Selector: Sports & Outdoors

I used the same brand but mine is just off/on.
(I didn't see the need for the 1-2-both battery modes.)
Amazon.com: 9003e e-Series Battery Switch Single Circuit ON/OFF: Sports &…

Also when my trailer is at home I have it connected
to a battery tender Jr. I still shut off the battery disconnect
every time it's not in use but the battery tender stays
connected until we hitch up.

RANT MODE ON-- BATTERY DISCONNECT SWITCHES
SHOULD BE STANDARD EQUIPMENT ON ALL RVs!!!
Rant off........
__________________
Peace!
Dan & Rita D
2004 5.3L Silverado 1500 ext. cab 2WD
1999 Suzuki Intruder Motorcycle
Blue Ox WD hitch, AirLift load levelers

Camping days 2010-53, 2011-47, 2012-41,
2013-41, 2014-31, 2015-40, 2016-44, 2017-63
KyDan is offline   Reply With Quote
Old 08-18-2010, 08:16 AM   #10
Site Team - Lou
 
Herk7769's Avatar
 
Join Date: Oct 2009
Location: South Eastern PA
Posts: 21,169
My disconnect looks like this

The two battery one.
Attached Thumbnails
Click image for larger version

Name:	IMG_2269.jpg
Views:	59
Size:	56.9 KB
ID:	3184  
__________________

__________________

Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW
Herk7769 is offline   Reply With Quote
Reply

Tags
battery

Thread Tools
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



» Virginia Campgrounds

Reviews provided by




ForestRiverForums.com is not in any way associated with Forest River, Inc. or its associated RV manufacturing divisions.


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 07:17 AM.