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The Medium Solar Panel is a power generation item.
It only produces power when exposed to sunlight. The two panels are folded upward over the center when it is not exposed to sunlight. The Medium Solar Panel doesn't have any power output cables, therefore must be placed on a Platform with 2-slot connection in order to get produced power.
The Pre-Release version had a similarity to pathfinder from the movie "The Martian". It has 3 panels, which were changed to 2 along with a new model later in Pre-Alpha.