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Old 12-09-2017, 07:59 PM   #1
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Battery storage

How should my battery be stored for the winter? Do I just need to disconnect it and leave in RV for the winter or bring inside It gets sub zero in my neck of the woods. Should it be on a charger for the winter? If so what type?
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Old 12-09-2017, 09:57 PM   #2
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I put a full charge on my GC-2's in November then disconnected them and they stay outside in the sub zero temperatures until they get reconnected and another full charge in April. They lose about 10% charge through the winter. Have been doing that for 7 years with the existing batteries and they are still going strong. No need to baby them inside with a trickle charger through the winter.
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Old 12-11-2017, 10:19 AM   #3
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My neck gets down to -40 and I bring them in and baby them lol. I use Genius chargers/maintainers for all my batteries, they also will charge the LiFe batteries I use in my fishing kayak.Click image for larger version

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Old 12-11-2017, 04:03 PM   #4
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I have used several methods in my years of both boats and RVs.

If you are the store and forget mentality, the key is to make sure batteries are fully charged before storing. And they cannot be left connected - almost every vehicle, including riding lawn mowers, has some sort of parasitic current draw that will discharge your battery long before spring. Once mostly discharged, a lead-acid battery loses some of its capacity, even when fully recharged. And, when mostly discharged, a lead-acid battery is susceptible to freezing on those super-cold nights in February - which will render the battery almost incapable of holding a charge come Spring. Again, fully charge the battery in November, disconnect it, and you will be good to go in April. Note, the factory disconnect in most RVs does NOT get rid of all the parasitic loads.

Second method is similar to the first, just put the batteries on a charger every 2-3 months. This is what I generally use with my A-frame stored in the garage. I installed a true disconnect at the battery box so I can leave batteries and wires in place.

Third method, favored by many, is remove batteries from RV (or disconnect) and hook them up to a battery maintainer. In this method, the key is a battery maintainer, not charger, that does not over-charge the batteries. Anything more than 13.2V output is too much. Check your battery voltages when hooked up to the maintainer. And make sure the batteries are disconnected - battery maintainers are not designed to both maintain and carry a parasitic load of any size.

The fourth method is to leave your RV plugged in all winter, and let your converter maintain your batteries. Make sure the battery voltage drops to 13.2V or less after a few days - my factory-issue WFCO converter would never go into trickle mode (13.2V) and damaged my first set of batteries. The replacement Progressive Dynamics converter does a fine job of maintaining the batteries when I'm plugged in.

Any of the above methods work well with the given caveats. Check the battery water level in the Spring, and refill any loss with distilled water.

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Old 12-11-2017, 05:01 PM   #5
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Even tho I live in TX, I'm a Coloradan and know a little about cold weather.

I'd recommend using a trickle charger, wherever they're stored. If you disconnect and leave them in freezing weather, there's a chance the charge will get low and they will freeze/expand/bust. A fully charged battery is safe from freezing (down to like -75*), but as the charge depletes the freeze point increases. With no charge they'll freeze at about 32*.

Ditto if you put them in an unheated garage.


Since the chances are good that your TV won't charge the battery very fast, a trickle charger will also ensure your battery is charged when you head out again.
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