What Is a Solar Damper?
A solar damper is a mechanical damping device used in solar tracking systems to absorb vibration and reduce excessive movement caused by wind
loads and dynamic forces.
Unlike a linear actuator, which drives the movement of the solar
tracker, a solar damper controls and stabilizes that movement. By minimizing wind-induced oscillation, it helps improve tracker
stability, reduces stress on mechanical components, and supports
reliable long-term operation in demanding outdoor environments.
In utility-scale solar tracking projects, dampers are typically
installed at key structural positions where higher wind loads may
occur, helping the entire tracking system operate more smoothly,
safely, and reliably.
Why Do Solar Tracking Systems Need Dampers?
Strong winds are one of the biggest challenges for utility-scale solar tracking systems. Without effective damping, wind-induced vibration and excessive
movement can increase stress on actuators and structural
components, potentially affecting long-term system stability.
Solar dampers help absorb vibration, control excessive movement, and improve the
overall stability of the tracker structure. Working together with linear actuators, they help the system
operate more smoothly under changing outdoor conditions.
How Does a Solar Damper Work?
A solar damper does not generate movement. Instead, it provides
damping resistance against excessive motion, helping reduce sudden
vibration and control oscillation caused by wind and other external
disturbances.
During normal tracker operation, the damper works together with the
tracker structure and drive system to help stabilize movement
without replacing the positioning function of the linear actuator.
Designed for Solar Tracking Systems
The U21A solar damper is developed for photovoltaic tracker
applications where controlled damping is required under wind and
other external disturbances.
Its force capability and installation dimensions are selected
together with the tracker structure and project conditions.
12,000N Max. Restoring Force
12,000N Max. Compressive Force
42mm/s Speed
IP66 Protection Class
U21A Solar Damper Specifications
| Parameter | Specification |
|---|
| Model | U21A |
| Application | Photovoltaic Solar Tracking System |
| Max. Restoring Force | 12,000N |
| Max. Compressive Force | 12,000N |
| Max. Lateral Force | 2,000N |
| Speed | 42mm/s |
| Protection Class | IP66 |
| Salt Spray Test | 800H |
| Ambient Temperature | -40°C to +65°C |
| Stroke | Project-specific |
| Front-End Hole | Ø21.5mm Standard / Customized Option |
| Rear-End Hole | Ø21.5mm Standard / Customized Option |
| Fully Extended Length | Project-specific |
| Fully Retracted Length | Project-specific |
Dimensions & Installation
U21A stroke, fully extended length and fully retracted length are
defined according to the tracker geometry and installation position.
The standard front-end and rear-end connections use Ø21.5mm mounting holes. Customized mounting-hole configurations can also be evaluated
when required by the tracker structure.
Typical Applications
- Utility-scale solar tracking systems
- Single-axis solar trackers
- High-wind solar installations
- Desert solar power plants
- Ground-mounted photovoltaic systems
Looking for Another Solar Damper Configuration?
For tracker projects with different force, mounting or structural
requirements, TOMUU also offers the U21C Solar Tracker Damper. U21A and U21C use different product configurations, so model
selection should be based on the required force, installation
dimensions, mounting structure and tracker design.
View U21C Solar Tracker Damper →
Solar Tracker Project Experience
TOMUU U20 Series actuators and U21 Series dampers have been
supplied together for utility-scale photovoltaic solar tracking
projects. The actuator drives and positions the tracker, while the
damper helps control unwanted movement caused by wind and other
external disturbances.
View U21 Damper Project Case →
Why TOMUU for Solar Tracker Dampers?
57GW+ Cumulative Solar Actuator Applications Worldwide
Since 2017 Solar Tracking Application Experience
TOMUU has been involved in solar tracking applications since 2017,
with actuator solutions applied in more than 57GW of solar projects worldwide.
Through these projects, TOMUU has accumulated experience with tracker structures, drive systems, installation conditions and
long-term outdoor operating environments.
Reliable solar tracking is not only about driving and positioning
the structure. Under wind and other external disturbances,
controlling unwanted movement is also an important part of tracker
mechanical stability.
Built on this accumulated solar tracking experience, TOMUU expanded
its solar product range from drive actuators to complementary
tracker components, including the U21 Series solar damper.
Solar Manufacturing Capability
TOMUU supports solar tracking projects with manufacturing resources
for actuator and damper products. Production is arranged according
to the mechanical configuration and installation requirements of
different tracker projects.
R&D & Testing for Solar Tracker Components
Testing & Validation Load · IP · Durability · Performance
Solar tracker components are evaluated for the mechanical and
environmental conditions of long-term outdoor operation.
The current U21A specification includes IP66 protection, an operating temperature range of -40°C to +65°C, and an 800-hour salt spray test.
Find the Right Solar Tracker Damper
Send us your required force, stroke and installation dimensions for damper selection.
Related Resources
U21C Solar Tracker Damper
Explore another TOMUU solar damper configuration for different
force, mounting and tracker requirements.
View U21C Solar Tracker Damper →
Industrial Linear Actuators and Dampers for the Samarkand 1 Solar
PV + BESS Project
See how TOMUU U20 Series actuators and U21 Series dampers were
supplied together for a utility-scale photovoltaic solar tracking
project.
Read Case →
Linear Actuator Selection Guide
Learn what load, stroke, installation and structural information
should be confirmed when evaluating components for solar tracking
systems.
View Selection Guide →
