STR-21G Sun Tracker
  • STR-21G Sun Tracker
  • STR-21G Sun Tracker
  • STR-21G Sun Tracker

STR-21G Sun Tracker

With an integrated GPS receiver, 4-quadrant precision sun sensor, and Harmonic Drive® technology, the STR-21G Sun Tracker is built 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 is not perfectly oriented or levelled, and can support a range of Global, Diffuse and Direct Radiation measurement sensors for custom configurations.


  • 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
  • Harmonic Drive® mechanical gear system, for maximum positioning accuracy
  • Deployed in Antarctica, proven in extreme climates worldwide
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