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 - Tractor Hydraulics - The Basics - by Curtis Von Fange. Hydraulics was one of the greatest inventions for helping man compound the work he can do. It’s amazing how a little floor jack can lift tons and tons of weight with just the flick of a handle. What’s even more amazing is that all the principals of hydraulic theory can be wrapped up in such a small package. This same package applies to any hydraulic system from the largest bulldozer to the oldest and smallest tractor. This short series will take a look at the basic layout of a simple hydraul
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