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Old 01-03-2012, 08:10 PM   #29
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So I post this one more time. If you want to never deal with this again just turn on your aux batt and bypass all of the inverters, isolators or converters. If your batteries aren't completely shot you will have instant full power every time you turn the key. i am assuming you are plugged in to a 30 to 50 amp power cord. If not, ignore everything I just said.

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Old 01-04-2012, 07:31 AM   #30
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Guess I'm buying new house batteries. Yesterday afternoon batteries showed 12.7, left the aux battery switch on overnight, this morning, 7.7 volts, have no idea what is drawing them down, if I turn batteries off, they hold a charge

J Stemler

2004 Adventurer 38G
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Old 01-04-2012, 10:32 AM   #31
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Being drawn down as low as they were previously may have damaged them. Charge them back up then have them load tested (free testing at many places). 10.5VDC is considered 0% charge which is a no-no. For maximum life, you should only draw a deep cycle battery down to 50% capacity (12.1VDC) before recharging. They can usually suffer an occasional draw down below 50% but that can shorten the life of or damage the battery. Shorten life means they can be charged up but the capacity (i.e 220AH) is greatly reduced to a small value (i.e 50AH). All batteries suffer reduced capacity with age. Usually just not as noticble untill many years have passed.
Sometimes a battery can be brought back to life by using a charger that can perform desulfication (breaking up of the crystalization) then appling a small 5 amp recoverery charge for several days. Then top off with a normal 3 stage charge. However success is a hit and miss situation. Sometimes it works, typically it doesn't or the owner decides to just replace the battery rather than worry about it's condition.

Dave in Virginia
1978 Winnebago Chieftain
Dodge M400 - 440-3
Classic Winnebago Site: http://www.classicwinnebagos.com/forum/index.php
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Old 01-13-2012, 03:04 PM   #32
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Pulled batteries out, brought them into basement to warm up, put them on charger, and was able to bring them up to 100 percent charge. The charge stayed up for several days, only dropping to about 12.75 and 12.71. Thought I was going to be OK, decided to test with a hydrometer, one battery tested in need of charge, the other was ok, but not good, and that one had one cell completely dead. Replaced both today with DC 27 Dekas. While batteries were out, wired brushed, primed and coated battery tray with spray undercoating, took several days to dry because of cold weather. Lesson learned....even thought batteries show a charge with a meter, you really need to test with a hydrometer to get accurate reading. Thanks to everyone who responded with help and suggestions. Next project TIRES !!!!
J Stemler

2004 Adventurer 38G
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Old 01-13-2012, 03:31 PM   #33
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J Stemler, All kinds of little items that one does not think about. LP Sensor,Antenna RF Amplifier,Radio Memory hold, dish memory hold if equipped and the inverter if its not turned off to mention the ones that come to mind at the time.
So 2.75 amps is a good reading with just the items listed.
The best option is to add a disconnect switch right at the house batteries and the chassis battery. If the grounds are open at the batteries and your batteries are good( no internal shorts) the charge should hold up for a good while. Cold temps. will reduce the charge level faster and the charge will slowly decrease even in warmer weather.


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