EKO Instruments

STR-21G Sun Tracker

ClimateMeteorological Station & Sensors

A single-arm, 2-axis sun tracker with an easy, fully automated setup procedure and low power consumption, the STR-21G is built to deliver unparalleled precision, optimal positioning, and reliability, whatever the weather.

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Overview

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.

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.

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

Key Features

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

Comparison

Comparison of EKO Instruments SunTracker

	STR-21G Sun Tracker	STR-22G Sun Tracker	STR-32G Sun Tracker
Arms	1	2	2
Pointing Accuracy		< 0.01°
Rotation Angle Zenith		-15 to 95°
Rotation Angle Azimuth		0 to 360°
Torque	12 N⋅m	24 N⋅m	60 N⋅m
Payload side arms	7kg	15kg	60kg
Sun sensor FOV		30°
Ingress Protection		IP65
Communication		RS-422 / 232C
Power Consumption	< 20W	< 20W	< 25W
Motor	Stepper motor
Driving Technology	Harmonic Drive®
Tracking Mode	Automatic & Manual	Solar position / Free positioning	Solar position / Free positioning