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STR-22G Sun Trackers

Make:  Eko       Model:  STR-22G
✅ 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
✅ RS-232 serial interface for position control

The compact 2-arm STR-22G sun tracker is perfectly suited to support all kinds of Global, Diffuse and Direct Radiation measurement sensors.

Besides the standard EKO sensor mounts, various alternative mounts for non-EKO sensors are available. Featuring a fully automated set-up procedure via an onboard GPS receiver, providing increased reliability and enhanced functionality, the compact Sun-Tracker guarantees accurate sun tracking and pointing of the attached solar sensors from sunrise to sunset.

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 levelled properly. The sun-tracker comes standard with a small table tripod (larger tripod available). The 24 VDC low power consumption tracker can be powered by a solar-powered battery system or DC power supply. A wide range AC power adapters can be supplied to connect to the grid.

For over 20 years, clients who have deployed STR sun-trackers have enjoyed easy set-up, smooth operation, and reliable tracking.







Pointing accuracy Solar elevation: 0 to 87°

< 0.01 °

Angle resolution

0.009 °

Rotation angle Zenith

-15 to 95 °

Rotation angle Azimuth

0 to 360 °


24 Nm

Payload side arms


Sun sensor FOV

30 °

Ingress protection IP


Operating temperature range

-40 to 60 °C


RS-422 / 232C

Power Consumption

< 10 W

Power Supply

21 to 31 VDC / 15W


Stepper motor

Driving Technology

Harmonic drive®

Tracking Mode

Solar postion / Free positioning


Table tripod

Pyrheliometer mount

Adjustable / One sensor position

Cable length

10 m


15.5kg (with tripod)