STX — wireless automation for single-axis solar trackers (STC controller, STS sensors, STG gateway)
Country: · Model: STX
STX is wireless automation for single-axis solar trackers made of three devices, the STC controller, STS sensors and STG gateway, which exchange data over Zigbee. About 16 STC controllers are needed per 1 MW of peak power. The system is intended for ground-mounted PV plants, including on difficult terrain.
- Composition
- STC (controller), STS (sensors), STG (gateway)
- Communication
- Zigbee; Bluetooth for setup; Ethernet/Modbus TCP and web interface in STG
- Density
- about 16 STC per 1 MW of peak power
- STC power supply
- from a PV panel (with LiFePO4 battery) or from AC mains
Technical specifications
| Composition | STC (controller), STS (sensors), STG (gateway) |
|---|---|
| Communication | Zigbee; Bluetooth for setup; Ethernet/Modbus TCP and web interface in STG |
| Density | about 16 STC per 1 MW of peak power |
| STC power supply | from a PV panel (with LiFePO4 battery) or from AC mains |
| STS inputs | anemometer, pyranometer, 4–20 mA sensors, RS-485 |
| Functions | single-axis tracking, safe position on wind/discharge, 3D backtracking, cloudy weather logic, SCADA integration |
| Gateway | with UPS, scaling and redundancy using several STG |
Specifications are taken from the manufacturer’s technical documentation. Updated .
Description
The STC is mounted fixed relative to the rotation axis and controls the motor, which turns the row axis through a gearbox. The controller calculates the position from the site coordinates and the time synchronized by the communication network. It is powered from a separate PV panel, from the panel of its own string, or from AC mains, and the version with a PV panel has a LiFePO4 battery. The STS collects field measurements from an anemometer, a pyranometer and other sensors with a 4–20 mA or RS-485 output, in particular wind speed and direction. STC and STS are set up from a phone over Bluetooth. The STG gateway controls many STC and STS over Zigbee, has an Ethernet output for SCADA over Modbus TCP and a web interface, and its cabinet is equipped with a UPS. The logic includes 3D backtracking, which removes mutual shading of rows on uneven terrain, cloudy weather and automatic transition to a safe position in strong wind or battery discharge.
How to choose
The number of devices is calculated from the site power. Allow about 16 STC for each megawatt of peak power, and add STS sensors and the STG gateway where wind data and dispatching are needed. If the plant is large or communication redundancy is needed, several STG gateways work together. Powering the STC from a PV panel is convenient where there is no AC mains, and from AC mains where the line is already laid.
Request a price and lead time
STX — wireless automation for single-axis solar trackers (STC controller, STS sensors, STG gateway). We reply within one business day.
Or email office@usk.ua or call +38 (044) 339-50-20.
FAQ
How many STC controllers are needed per 1 MW of a solar plant?
About 16 STC controllers per 1 MW of peak power, if the panels are standard.
What communication does the system use and how is it integrated with SCADA?
The devices exchange data over Zigbee, and the STG gateway has Ethernet and passes data to the dispatching system over Modbus TCP. Controllers and sensors are set up over Bluetooth.
Which sensors connect to the STS?
An anemometer, a pyranometer and other sensors with a 4–20 mA or RS-485 output. A separate function of the device is wind speed and direction.
What does the tracker do in strong wind or battery discharge?
The controller automatically moves the tracker to a safe position. Separately, 3D backtracking works, which excludes mutual shading of rows.
What powers the STC controller?
A separate PV panel, a panel of the same string, or AC mains. The version with a PV panel has a LiFePO4 battery.
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