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 - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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