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What’s the Relationship Between TCU and NCU in a Solar Tracker System?
In a solar tracker system, both the TCU (Tracker Control Unit) and NCU (Network Control Unit) play essential roles — working together like the “field operator” and the “command center.”

▪️ TCU (Tracker Control Unit)
Installed on individual trackers or tracker groups
Controls motors to adjust the tilt angle based on solar position
Collects sensor data and executes tracking algorithms
Operates locally, can support offline tracking if needed
▪️ NCU (Network Control Unit)
Installed at a centralized location in the solar plant
Manages and monitors multiple TCUs across the site
Connects to SCADA/cloud platforms for remote control and data management
Acts as the communication hub between TCUs and the control center
▪️ How They Work Together
NCU receives instructions from the SCADA/cloud
It distributes commands to each TCU
TCUs drive the motors and report status back to the NCU
NCU aggregates data and uploads it to the control platform
8.
▪️ Think of it this way:
NCU = The brain, managing the big picture
TCU = The hands, executing real-time motion
Together, they ensure your solar tracking system stays efficient, responsive, and intelligent.