Several kind of solar tracking systems are proposed in the literature; one can classify them according to the degree of freedom and control strategy. The schematic below illustrates types of solar trackers.
|Degrees of freedom (DoF) and/or control strategy:||Control Strategy|
|?Fixed devices – Domestic and small-scale commercial photovoltaic and hot-water panels are usually fixed, often flush-mounted on a roof top.||Passive controlled trackers – have no electronic sensors or actuators|
|Single-axis trackers – Single-axis solar trackers rotate on one axis moving back and forth in a single direction.||Open-loop controlled trackers
|Dual-axis trackers – Dual-axis tracker, along with the function of a single axis tracker follows the sun vertically and horizontally and helps obtain maximum solar energy generation.||Closed-loop controlled trackers.
Open and closed loop trackers together can be called as Active tracker.
|Concentrated photovoltaic (CPV) trackers