When selecting a solar tracker control solution, many customers ask the same question:
Is an NCU mandatory, or can the system operate with TCU only?
At GF New Energy Technologies, we believe that a clear understanding of system architecture is essential for making the right technical and commercial decisions. This article explains the respective roles of TCU (Solar Tracker Control Unit) and NCU (Network Communication Unit), and how they work together in different project scenarios.
The solar tracker controller TCU is the core controller installed directly on each tracker row. It is responsible for:
Calculating tracking angles
Controlling the drive motor
Executing tracking algorithms
Managing local protection logic (wind stow, position limits, etc.)
Ensuring accurate and stable movement of the tracker
In simple terms, the TCU is the “brain” of each individual tracker row.
→A tracker system cannot operate without a TCU.
The NCU acts as a centralized communication and coordination unit for multiple TCUs within a solar plant. Its main functions include:
Centralized data collection from multiple TCUs
Communication with SCADA or monitoring platforms
Network management (Ethernet or SIM-based communication)
Centralized command distribution (stow commands, operation modes, etc.)
Optional integration of external sensors (e.g. wind sensor)
→The NCU does not replace the TCU — it complements it.
The answer depends on the project scale and system architecture.
In small or decentralized projects, each TCU can operate independently without an NCU.
This setup is suitable when:
The project scale is limited
Centralized monitoring is not required
Communication infrastructure is minimal
For utility-scale and grid-connected solar plants, adding an NCU offers clear advantages:
Centralized control and monitoring
Simplified commissioning and maintenance
Easier integration with SCADA systems
More efficient plant-level management
→ For large-scale solar projects, NCU is strongly recommended but not strictly mandatory.
GF controllers are designed with flexibility in mind. Our philosophy is to allow customers to choose the most suitable architecture based on real project needs — not to force unnecessary complexity.
With GF solutions:
TCUs can operate independently
NCUs can be added for centralized control
Communication modes can be Ethernet or SIM-based
System expansion remains simple and scalable
This flexibility allows EPCs and developers to optimize both technical performance and project cost.
Understanding the difference between TCU and NCU helps avoid overdesign or underdesign of the tracking control system. A well-matched architecture ensures:
Stable tracker operation
Easier commissioning
Lower long-term maintenance effort
Better system reliability
At GF New Energy Technologies, we focus on delivering practical, field-proven controller solutions that adapt to real installation scenarios worldwide.
For technical consultation or product selection support, please contact:
info@gfnewenergy.com
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