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.
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.
- 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 Antartica, proven in extreme climates worldwide
| 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 IP | 65 |
| 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) |
