Technology / Tracker Controller Unit
Tracker Controller Unit (TCU)
The TCU is the field-level controller that manages an individual solar tracker row. It handles solar position tracking, motor control, sensor inputs, and autonomous safety stow — operating independently so that no single row failure affects the rest of the site.
Each tracker row on a TrackLab site has its own TCU, communicating with the site-level Network Control Unit (NCU) via LoRa, RS485, CAN-2.0, or fibre (TCP/IP).
Where the TCU Fits
Technical Specifications
Operating Temperature
-20°C to +60°C
Enclosure Rating
IP65, NEMA4X, IK05
Communication
LoRa, RS485, CAN-2.0, Fibre (TCP/IP)
Tracking Type
Single-axis horizontal
Power Supply
Solar panel with battery backup
Firmware Updates
Over-the-air (OTA) via NCU
Key Capabilities
Independent Row Tracking
Each TCU runs its own solar position algorithm. Tracker rows operate independently — if one TCU has an issue, every other row continues tracking without interruption.
Automated Stow-for-Safety
Configurable wind, hail, and snow thresholds trigger autonomous stow. The TCU acts on local sensor data and NCU-broadcast weather parameters for rapid response.
Remote Firmware Updates
TCU firmware can be updated over-the-air from the cloud portal via the NCU. No on-site USB or serial connection required.
Parameter Broadcasting
The NCU broadcasts tracking parameters, backtracking schedules, and configuration changes to all TCUs on site. Individual TCU overrides are also supported.
Environmental Resilience
IP65 and NEMA4X rated enclosures protect against dust, moisture, and UV exposure. Designed for the harsh conditions of Southern African solar farm environments.
Multi-Protocol Communication
Each TCU connects to its NCU via LoRa (long-range wireless), RS485 (wired industrial), CAN-2.0, or fibre (TCP/IP). Protocol choice is per-site based on terrain and infrastructure.
Field Deployment
Installation
- Mounts directly on the tracker structure
- Connects to motor drive and sensors
- Configured remotely after physical installation
Commissioning
- Auto-discovery by the site NCU
- Remote parameter configuration via portal
- Tracking verification and calibration
Maintenance
- OTA firmware updates — no site visit needed
- Remote diagnostics via monitoring portal
- Field-replaceable unit design
Related Documentation
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Cite this page
TrackLab Solar. (2026). Tracker Controller Unit (TCU). Retrieved from https://tracklabsolar.com/technology/tracker-controller-unit
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