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Old 06-25-2016, 03:05 PM   #1
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Batteries & City Power

We're newbies to travel trailers. My TT has 2 batteries connected in parallel. I'm trying to determine what to do between outings, which could be up to 3-4 weeks. Do I plug the TT back into my home AC while it is sitting on my RV pad or hook the batteries up to a Battery Tender? I have seen contradicting comments. Some say if the TT is connected to city power for an extended period of time I might fry my batteries. According to my owners manual "when not in use, keep hooked up to AC if possible and let the converter first charge and then maintain the battery charge". I will move the batteries to my garage during the snowy winter here in Utah and keep them on the Battery Tinder, but what about summertime?
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Old 06-25-2016, 03:11 PM   #2
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Newer RVS have very capable 3 stage converter/chargers.
We've been plugging our shore cord into a home outside outlet for 10 years now.
NEVER have needed a separate battery charger.
And the batteries are at least 8 years old now.
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Old 06-25-2016, 03:30 PM   #3
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I had 3 one-year-old batteries dry out from being connected to the factory-installed 4 stage converter/charger for 5 months in storage. I now let that unit fully charge the batteries for a few days, then turn off the power to it and rely on a maintainer. No problems since then.
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Old 06-25-2016, 04:53 PM   #4
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Leave it plugged into shore power between outings. Check battery fluid after one week, if it is not bubbling vigorously then all is good.
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Old 06-26-2016, 02:42 PM   #5
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I just hit the DC disconnect the batteries stay fully charged for six months at a time. Assuming they are fully charged at the time I park it. Been doing this for years. Never had a battery issue
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Old 06-26-2016, 06:10 PM   #6
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Neither. Plug in overnight when you get home....then unplug and disconnect the negative wire from the batteries to ground.
In one month your 100% charged battery will be no less than 85% charged in "room temperature weather. There is no need and some risk to keeping a unit plugged in. Battery tenders are unnecessary unless you are going awol for 90 days or more.
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Old 06-26-2016, 07:56 PM   #7
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Quote:
Originally Posted by Tomgky View Post
I just hit the DC disconnect the batteries stay fully charged for six months at a time. Assuming they are fully charged at the time I park it. Been doing this for years. Never had a battery issue
X2. But depends a lot on what part of the country you are in. We are on the west coast close to Vancouver BC, Only see a dozen nights of frost most years. Isolate the batteries in the fall and most years they are 3/4 Charge in the spring. Hook them up to the generator for a couple of hours and back to full charge. I always disconnect the batteries when we store, even if it's only a week. Stops parasitic drain. Our batteries are on thier fifth season.
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Old 06-27-2016, 07:34 AM   #8
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Quote:
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I just hit the DC disconnect the batteries stay fully charged for six months at a time. Assuming they are fully charged at the time I park it. Been doing this for years. Never had a battery issue
I dough very much if your plan would work in Michigan ???
Or any where in the North Country !!!
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Old 06-27-2016, 08:26 AM   #9
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I dough very much if your plan would work in Michigan ???
Or any where in the North Country !!!
I assume you are referring to the cold weather. Actually batteries hold their charge FAR better...2-3 TIMES better in cold and freezing weather than in summer heat. Getting a car started is harder....but keeping a battery full is easier. You may expect a disconnected battery to lose roughly 5% of charge per month in winter vs. around 15-20% in summer.
The KEY is a FULLY charged battery to avoid freezing. A fully charged battery will not freeze till -91 degrees. At 62% charge you're good to -16 degrees and at 40% charge you will freeze at +5 degrees.
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Old 06-27-2016, 08:41 AM   #10
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Thanks Cam for the Info,,, sounds like you know Batteries !!!
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