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Old 09-29-2015, 12:45 PM   #11
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If you put the battery tender on it, you don't HAVE to put it in the basement. A charged battery won't freeze. (Look at the one in your car, for example). I put mine in my garage with the battery tender. When it goes to -20F outside, the garage is usually about 0F against the house wall. No problems.
I agree that a charged battery won't freeze, but, for all the effort, I pull mine out of the trailer and put in the basement for the winter. Every month or so I put a battery tender on it for a few days.
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Old 09-29-2015, 12:59 PM   #12
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I keep our TT plugged into shore power during the winter. It keeps the batteries charged and runs the dehumidifier which runs off a timer so that it is not running continuously. But here on the Sunshine Coast of BC we rarely get more than a few degrees of frost.
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Old 09-29-2015, 01:28 PM   #13
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If you store it on the floor make sure to place a wood board underneath it.
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Old 09-29-2015, 01:47 PM   #14
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I agree that a charged battery won't freeze, but, for all the effort, I pull mine out of the trailer and put in the basement for the winter. Every month or so I put a battery tender on it for a few days.
How critical is it to attach a battery tender if stored in the basement (from now till end April)? And what size tender should I get - for a 12v RV battery? Is CDN Tire the best place to get one in CDA?
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Old 09-29-2015, 01:58 PM   #15
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Response to several above comments;

You do not have to be concerned about storing lead acid batteries on concrete floors. The new case materials prevent any discharge resulting from being stored on concrete.

You should leave the battery connected to a converter that is on all the time unless you check water monthly or upgrade to a newer 4 stage converter. The converter supplied as OEM in most RV will boil out the electrolyte. You can install a disconnect switch or a separate 110V line to run the dehumidifier. I ran mine through enclosed undercarriage then thru shower base to a separate outlet for the dehumidifier.

If you use a Battery Tender ( brand name) continually plugged in and connected to the battery, you do not need to remove the battery. It will not freeze. The freeze point of a lead acid battery that is 85% charged is -62F.
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Old 09-29-2015, 02:33 PM   #16
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Fully charge and disconnect battery minus cable. Good till spring. If using tender or minder make sure holding voltage does not exceed 13.0
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Old 09-29-2015, 02:39 PM   #17
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A fully charged battery will not freeze to a pretty low level.

There had to be an underlying problem with the battery for it to freeze while hooked up to a functioning converter.
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Old 09-29-2015, 02:58 PM   #18
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If you store it on the floor make sure to place a wood board underneath it.
was true 50 years ago but not anymore.
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Old 09-29-2015, 03:09 PM   #19
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How critical is it to attach a battery tender if stored in the basement (from now till end April)? And what size tender should I get - for a 12v RV battery? Is CDN Tire the best place to get one in CDA?
If fully charged with nothing connected, you don't need a battery maintainer. Give the exterior a good cleaning with a bit of baking soda to neutralize any acid contaminants and a clean water rinse and the self-discharge rate will be very low.

If you'd rather remove and use a maintainer, I'm partial to the Noco Genius series of chargers and Canadian Tire puts them on sale every few months. I use an 1100 on both my Mazda Miata and motorcycle (which don't leave the garage in the winter but have things like clocks that kill the batteries) and a 3500 on my TV (with big dual batteries which can also go a month or more between uses in the winter now that I'm retired).

I used to remove the RV battery and put on a maintainer in the garage but now I'm leaving the battery in the RV and keeping it plugged in over the winter (I installed a 30A outlet on the side of the garage this summer). My poor little WFCO is only 3-stage but one of those is a 13.2V float mode and I verified that voltage when this topic came up before and no water was needed in the spring.
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Old 09-29-2015, 05:46 PM   #20
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I live in Montana, it gets a little chilly here. a fully charged battery will not freeze. I just shut of the battery switch and go inside and sit by the fire. never had a problem
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