STR-21G Sun Trackers

  • Single arm Sun Tracker
  • GPS for easy and accurate set up
  • Standard Integrated Sun sensor
  • Power consumption less than 10W
  • RS-232 serial interface for position control
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The compact single arm sun tracker is perfectly suited to support all kinds of Global, Diffuse and Direct Radiation measurement sensors. STR-21G is the base of the Solar Monitoring Systems (STR-21G-S), a turnkey measurement solution from EKO. The STR-21G provides a fully automated set up procedure through a GPS receiver providing increased reliability and enhanced functionality. 

From sunrise to sunset the compact sun-tracker guarantees accurate sun tracking and pointing of the attached solar sensors. The 2-axis tracker automatically adjusts to the sun’s position by the sun sensor closed-loop control system, even if the tracker is not oriented or leveled properly.

The sun-tracker comes standard with a small table tripod (larger tripod available). The 24 VDC low power consumption tracker can …

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  Specifications STR-21G
  Arms 1
  Pointing accuracy Solar elevation: 0 to 87° < 0.01 °
  Angle resolution 0.009 °
  Rotation angle Zenith -15 - 95 °
  Rotation angle Azimuth 0 - 360 °
Torque 12 Nm
Payload side arms 7 kg
  Sun sensor FOV 30 °
  Ingress protection IP 65
  Operating temperature range -40 - 50 °C
  Communication RS-422 / 232C
Power consumption < 10 W
  Power supply 21 to 32 VDC / 20W
  Power supply (Power Adapter) 100 to 240 VAC / 20W
  Dimensions mm 430 (W) x 380 (L) x 440 (H)
Weight 14.5 kg (With tripod)
  Motor Stepper motor
  Driving technology Harmonic drive®
  Tracking mode Solar postion / Free positioning
  Tripod Table tripod
  Pyrheliometer mount Adjustable / One position
  Cable length 10 m




Applications and uses

Diffuse Horizontal Irradiance measurements are best performed with a thermopile sensor called Pyranometer mounted on a Sun tracker with a shading device.  When the pyranometer is installed on an automatic …

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The Meteorological research community is very ambitious to understand climate changes and global impact on life. With modern advanced measurement equipment, e.g. satellites, remote sensing technologies and sophisticated computer models, …

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