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 - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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