U21C Solar Tracker Damper
The TOMUU U21C solar tracker damper is designed to slow and dampen tracker movement under wind gusts and other external disturbances, helping reduce excessive movement of photovoltaic tracker structures.
U21C is available with two force and speed configurations, providing different options for tracker structures, mounting conditions and project requirements.
25,676N Max. Restoring Force
25,676N Max. Compressive Force
4,350N Max. Lateral Force
IP66 Protection Class
Two Force & Speed Configurations
U21C provides two standard performance configurations. The appropriate version can be selected according to the force and movement requirements of the tracker system.
Configuration A
Speed 42mm/s
Restoring Force 25,676N
Compressive Force 25,676N
Configuration B
Speed 26mm/s
Restoring Force 14,200N
Compressive Force 14,200N
Which U21C Configuration Should Be Used?
Configuration selection should consider the required damping force, movement speed, installation dimensions and tracker structure.
U21C Solar Damper Specifications
| Parameter | Specification |
| Model | U21C |
| Application | Photovoltaic Solar Tracking System |
| Max. Restoring Force | 25,676N |
| Max. Compressive Force | 25,676N |
| Max. Lateral Force | 4,350N |
| Speed | 26mm/s / 42mm/s |
| Protection Class | IP66 |
| Salt Spray Test | 840H |
| Ambient Temperature | -40°C to +65°C |
| Stroke | Project-specific |
| Front-End Hole | Ø26.7mm Standard / Customized Option |
| Rear-End Hole | Ø26.7mm Standard / Customized Option |
| Fully Extended Length | Project-specific |
| Fully Retracted Length | Project-specific |
Dimensions & Installation
U21C stroke, fully extended length and fully retracted length are determined by the tracker geometry and mounting position.
The standard front-end and rear-end connections use Ø26.7mm mounting holes. Other mounting-hole configurations can be evaluated when required by the tracker structure.
Typical Solar Tracker Applications
- Utility-scale photovoltaic tracking systems
- Single-axis solar trackers
- Dual-axis solar tracking structures
- Solar installations exposed to wind disturbance
- Ground-mounted photovoltaic power plants
Looking for Another Solar Damper Configuration?
TOMUU also offers the U21A Solar Damper for tracker projects with different force, mounting and structural requirements. U21A and U21C use different product configurations, and model selection should be based on the required force, installation dimensions, mounting structure and tracker design.
View U21A Solar Damper →
Solar Tracker Project Experience
TOMUU supplies actuator and damper solutions for utility-scale photovoltaic tracking projects. In tracker systems using both components, the actuator drives and positions the structure, while the damper helps control unwanted movement caused by wind and other external disturbances.
One example is the Samarkand 1 Solar PV + BESS project, where TOMUU supplied U20 Series industrial linear actuators and U21 Series dampers for the solar tracking application.
Samarkand 1 Solar PV + BESS Project →
Why TOMUU for U21C Solar Dampers?
57GW+ Cumulative Solar Actuator Applications Worldwide
Since 2017 Solar Tracking Application Experience
TOMUU has supported solar tracking applications since 2017, with actuator solutions used in more than 57GW of solar projects worldwide.
The U21C extends TOMUU's solar tracker component range with two defined force and speed configurations, supporting different mechanical and installation requirements within tracker projects.
For U21C selection, TOMUU evaluates the required restoring and compressive force, movement speed, stroke, mounting dimensions and tracker structure together.
Manufacturing for Solar Tracker Components
TOMUU supports the production of linear actuators and dampers for solar tracking applications, with manufacturing processes covering assembly, inspection and product testing.
U21C Testing & Environmental Specifications
U21C is specified with IP66 protection, an operating temperature range of -40°C to +65°C, and an 840-hour salt spray test for outdoor solar tracking applications.
Select the Right U21C Configuration
Send us your required force, speed, stroke and installation dimensions for damper selection.
Related Resources
U21A Solar Damper
Explore another TOMUU solar damper configuration for different tracker force and installation requirements.
View U21A Solar Damper →
Samarkand 1 Solar PV + BESS Project
See a utility-scale solar tracking application using TOMUU U20 Series actuators and U21 Series dampers.
View Project Case →
Solar Tracker Damper Solutions
Explore TOMUU solar damper options for different photovoltaic tracker structures and project requirements.
Explore Solar Dampers →
Linear Actuator Selection Guide
Review the load, stroke, installation and structural information used when evaluating components for solar tracking systems.
View Selection Guide →
