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 6/14/2015 10:00 AM
 
Need advice. My RV main battery drains its charge when the positive and negative posts are connected. Takes about a week. I can disconnect the negative cable and the battery will hold its charge.

I have looked and looked and cannot find a discharge source. May I have your thoughts and comments please?
Thanks.

Happy RVing to you & yours
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 6/15/2015 3:51 PM
 
 Modified By RVA  on 6/15/2015 2:53:02 PM
What you're experiencing is called "parasitic drain" and the amount of drain along with the battery condition and size determines how long the battery will take to discharge. If you Google "RV battery parasitic drain" you'll get a lot of hits.

In a nutshell, your battery is always working, even when you think everything is turned off. Depending on what's connected to the engine battery the drain will be more or less. On my motorhome, the engine computer, radio memory, LP detector, electronic battery disconnect switches, and electric steps all sip from the engine battery 24/7. While each only draws a fraction of an amp, it all adds up. In damp weather moisture on top of the battery, or grime, can also provide a tiny path between the battery posts for additional drain. If you're interested in how much power you're losing, you can disconnect the negative battery cable and use an ammeter between the post and the cable to read how much is constantly being drawn from the battery, even when you think everything is off. Good luck - Dave
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