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Old 11-28-2015, 09:22 PM   #1
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Battery draining problem

2004 Damon Ultrasport. If batteries are charged and unit plugged in, all is well.....when unit is unplugged batteries drain fast, killing them overnight.
Reasonably sure nothing is on.....I have no idea where to start.

I'm talking about house batteries....

Batteries stay up when driving, or when engine or generator is running.

Any ideas?
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Old 11-28-2015, 10:27 PM   #2
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How old

Quote:
Originally Posted by BuddyBob View Post
2004 Damon Ultrasport. If batteries are charged and unit plugged in, all is well.....when unit is unplugged batteries drain fast, killing them overnight.
Reasonably sure nothing is on.....I have no idea where to start.

I'm talking about house batteries....

Batteries stay up when driving, or when engine or generator is running.

Any ideas?
First off how old are the batteries? Next have you read each cell of the batteries with a battery hydrometer. Have the batteries been over charged or run low on water, Have they ever had the water boiled out from over charging or the batteries drained down to nothing. all of these things will kill batteries in no time and ruin them for good. you should have a disconnect switch that will disconnect the house batteries from the system when stored. Even when everything is turned off the system still uses 12 volts for the fridge and various appliances and things in the motor home unless you have a disconnect switch. some of the inverter / battery chargers are not 3 stage and will over charge the batteries and boil them dry ruining them in no time.
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Old 11-28-2015, 11:15 PM   #3
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Pull the batteries and have them load tested. I had the same issue with my Itasca and it was a battery with a dead cell. New batteries installed and all was well. Even if the batteries are fairly new, you can still have a defective cell or an open conductor.
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Old 11-29-2015, 06:30 AM   #4
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As asked previously, the age of your batteries are pretty important. If you are not the first owner of your MH and don't know when your batteries were installed, you can look on the top of the batteries to see if there is an installation date punched out on the tag. If you have owned your MH more that 4 years or so and have not replaced the batteries, I'd bet it's time to replace them.

Here's a link to a web site with information on deep cycle batteries, including how to test them. There is also information on how to maintain your batteries. Be careful about having your batteries tested at an auto parts store. Deep cycle batteries should be tested differently than regular car batteries.


Pacific Power Batteries - About Automotive Batteries
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