Single axis trackers rotate photovoltaic panels along one axis, typically north-south, to follow the sun’s daily east-west movement. This configuration increases energy output by 20 to 25 percent compared to fixed systems while maintaining simpler mechanics than dual-axis designs. Single-axis trackers represent the most economical tracking solution for utility-scale installations.
Technical Details
Single-axis systems use horizontal or tilted rotating shafts with panels mounted perpendicular to the axis of rotation. Motors typically operate via 24-volt DC circuits with mechanical limit switches preventing over-rotation. Structural designs accommodate wind speeds up to 120 mph per ASCE 7 standards.
Applications and Benefits
Utility-scale solar farms and large commercial installations benefit from single-axis tracking, achieving higher returns on investment than fixed systems. These trackers work effectively at latitudes between 30 and 50 degrees where seasonal sun angles vary significantly.
Practical Significance
Single-axis trackers require 30 to 40 percent more space than fixed arrays due to inter-row clearance preventing shading. Maintenance includes quarterly sensor checks and annual motor inspections, adding approximately 0.5 to 1 percent to annual operating costs.