A wire-tensioning system can be used to maintain tension in power wires extending from components of solar panels. A tensioning component attached to the frame of the solar panel and attached to the power wires can be used to maintain tension in the power wires, both when the power wires are unconnected to power wires of adjacent solar panels, and after the power wires are connected to the power wires of adjacent solar panels. Some attachment structures may be configured to be easily removable and re-attachable to the frame of the solar panel, while other attachment structures may be configured to penetrate or dig into the frame of the solar panel to form a more permanent attachment therebetween.