Sun Tracker - Single-arm, 2-axis sun tracker

Sun Tracker’s STR-21G is a single-arm, 2-axis sun tracker with an easy setup procedure and low power consumption. The STR-21G delivers unparalleled precision, optimal positioning and reliability whatever the weather.
The STR-21G Sun Tracker is designed to deliver unparalleled precision, optimal positioning, and reliability–whatever the weather. Easy to set up, the STR-21G automatically adjusts to the sun’s position even if the tracker isn’t perfectly oriented or leveled, and can support a range of Global, Diffuse, and Direct Radiation measurement sensors for custom configurations. The single configurable arm of the STR-21G can mount the MS-57 Class A Pyrheliometer for DNI readings and the optional MD-81-10 shading disk assembly, shielding any top-mounted pyranometer for diffuse solar radiation measurements.



  • All-Weather Tracking with Integrated GPS Receiver & 4-Quadrant Sun Sensor
  • low Power Consumption
  • Quick, Easy, Fully Automated Setup
  • Easy Integration with any DAQ system
  • Harrmonic Drive® mechanical gear system, for maximum positioning accuracy
  • Deployed in Antarctica, proven in extreme climate worldwide

Available on back-order