Sun Tracker Harmonic Drive® technology 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. SKU: STR-21G 0.000 (CNY) Qty: Add to cart Custom wishlist OK Add to wishlist Add to compare list Email a friend Specifications Compare Arms 1 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° Torque 12 N⋅m Payload side arms 7kg Sun sensor FOV 30° Ingress protection IP65 Operating temperature range -40 to 50°C Communication RS-422 / 232C Power Consumption < 20W Motor Stepper motor Driving technology Harmonic Drive® Tracking modes Automatic & Manual Tripod Table tripod Pyrheliometer mount Adjustable / One sensor position Cable length 10m Weight 14.5kg (with tripod)