I helped a friend install a similar system in a cabin in the Canadian arctic.
Yes, you need a charge controller. This prevents the solar cell from overcharging the battery.
There are nice complete kits on Amazon for just what you need. Include panel, charge controller, and all wire.
I would highly recommend doing what my friend did and buying 12 volt LED "standard base" light bulbs. These are 12 volt LED bulbs that have the same base as 120 volt bulbs in your home.
The advantage is that you can then use standard electrical components for inside the barn like light fixtures, wire, switches, etc. You don't need to run special 12 volt fixtures.
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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