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 Profile: Allis-Chalmers WD45 (Gas Version) - by Staff. Beginning production in 1953, the WD45 had the same general look as the WD tractor which was produced earlier - but was much more powerful. This was due to the new 4-cylinder "Power Crater" gasoline engine with a 4 x 4-1/2 inch bore and stroke. Some people feel this was one of the most significant tractors offered by Allis-Chalmers in those days. Nothing in its weight or power class could match its performance. In 1954 they began offering the WD45 with the new "Snap-Coupler&quo
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