The Solar Panel Small is a small-sized, single docking-port module used for supplying power to space stations. Like other parts that generate power other than batteries, it can recharge drained batteries. It produces 54 units of Power, of which it uses 2 and its solar panels retracts when it is turned off.
The panel is launched with the docking port facing outwards from the tug. The panel's lack of a second port, like found on the Solar Panel Large, which can cause issues when rearranging the part.