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 - Massey Ferguson 35 (and up) Tractor Assembly Notes - by Jack Wetmore. These assembly notes are for Massey Ferguson tractors with a two stage clutch and 6 speed, 8 speed and mutli-power transmissions. I see a lot of discussion forum messages regarding damaged clutches from improper assembly. The objective is to have the engine and transmission slide together safely and easily until the gap between the two halves is less than 1/4", BEFORE tightening any of the bolts holding the two together. Using bolts to draw the two halves together will damage the PTO
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