A solar panel supporting system includes a main frame, a solar panel, and a spring mechanism. The main frame has two opposite lateral sides. The solar panel is pivotally mounted on the main frame along a first pivot axis defined by a first rod extending between the opposite lateral sides of the main frame. The spring mechanism is operatively coupled to the solar panel for resiliently holding the solar panel at a predetermined position. The solar panel is adapted to pivot in response to wind strong enough to stretch or compress the spring mechanism.