Spring counter-balance assemblies and solar trackers incorporating springs to balance rotation
A solar tracker assembly is provided which includes a support column, a torque tube or torsion beam connected to the support column, a mounting mechanism attached to the torque tube or torsion beam, a drive system connected to the torque tube or torsion beam, and a spring counter-balance assembly connected to the torque tube or torsion beam. An exemplary spring counter-balance assembly comprises a bearing housing and a bushing disposed within the bearing housing and configured to be slideably mounted onto the torque tube or torsion beam, and one or more compressible cords made of a flexible material. The compressible cords are located between the bushing and the bearing housing and provide damping during rotational movement of the solar tracker assembly.
1 . A solar tracker assembly comprising:
a torque tube;
a column supporting the torque tube;
a solar module attached to the torque tube;
a drive system attached to the torque tube, the drive system being configured to rotate the torque tube and solar module relative to the column; and
a counter-balance assembly comprising:
a top bracket secured to the torque tube such that the top bracket rotates with the torque tube,
a bottom bracket secured to the column supporting the torque tube,
a damper attached at one end to the top bracket and, at an opposite end, to the bottom bracket, and
a spring incorporated into the damper.
2 . The solar tracker assembly of claim 1 , wherein:
the drive system is configured to rotate the torque tube and solar module relative to the column from a first position in which the solar module creates an overhanging weight on a left side of the torque tube to a second position in which the solar module creates an overhanging weight on a right side of the torque tube; and
the spring provides a counterbalance to overhanging weight of the solar module on at least one of the left and the right sides of the torque tube.
3 . The solar tracker assembly of claim 2 , wherein the spring provides a counterbalance to overhanging weight of the solar module on both the left and the right sides of the torque tube.
4 . The solar tracker assembly of claim 1 , wherein the damper controls a speed at which the torque tube and solar module rotate relative to the column.
5 . The solar tracker assembly of claim 1 , wherein the damper limits oscillation of the torque tube.
6 . The solar tracker assembly of claim 1 , wherein the damper provides a stop that prevents the torque tube from rotating more than a set amount.
7 . The solar tracker assembly of claim 1 , wherein the top bracket is secured to the torque tube via an elongated band that is attachable at each end to the top bracket and is sized and shaped to surround the torque tube.
8 . The solar tracker assembly of claim 7 , wherein the elongated band is shaped to surround a torque tube having a circular cross-sectional shape.
9 . The solar tracker assembly of claim 1 , wherein the bottom bracket is configured to be secured to the column at variable locations on the column.