I doubt your battery would discharge enough to freeze. However, adding another battery would make two batteries self discharging over the winter - not much improvement.
I have a small building in the woods I use for lunch and whatever when I am back there cutting wood and whatever. I have a 12 volt battery used for lights. I have one 5 watt solar panel screwed to a South facing wall and connected to the battery. No controller, just the panel connected directly to the battery - been like that for 7 + years. The panel charges the battery from occasional use and maintains it at full charge.
The panel is about 12" x 12" and they generally run around $30. Note - larger panels can be used however you will need a charge controller. The panel will need a "blocking diode" which is built into most/all of the smaller panels for battery charging.
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Today's Featured Article - Women and Tractors, A Woman's Touch - by Teri Burkholder. I thought I would give you a little background on how I got myself hooked on tractors and their restoration. My family is a very "crafty" bunch of people. By crafty I mean good with crafts!! My Dad is a retired industrial engineer from Bucyrus Erie which made big shovels for excavating and he is also a wonderful wood worker. My mom and my "guardian angel" has had her own ceramic shop for 30 years and is an excellent painter. With these skills always active in our house it was hard not t
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