Safety And Stowing Strategies For Trackers

As utility-scale projects expand into diverse geographies and extreme weather events become more frequent, safeguarding trackers and the integrated modules is crucial. A controlled panel positioning to navigate the solar system through such adverse conditions is typically referred to as stowing. However, a stow position is not merely a fixed safety angle. It is an integrated control function combining wind sensing, terrain adaptation, structural design, and software algorithms. Modern stow approaches combine mechanical robustness with advanced control logic, enabling trackers to respond dynamically to high winds, hail, snow loads, and other environmental stresses. And every tracker maker finds its own sweet spot for stowing in response to a specific weather condition. In fact, stowing strategies have emerged as a key engineering focus area in the trackers segment, as emphasized by leading suppliers participating in this survey. Thus, this sub-chapter in the report covers the topic exclusively. The following section outlines the different stowing strategies discussed by leading tracker manufacturers and highlights how suppliers are refining both hardware and software to enhance system resilience (see Smarter Control Systems Drive Solar Tracker Performance).

Higher wind loads are among the most common critical weather conditions trackers face. Thus, wind behavior remains a key design parameter in tracker engineering. Suppliers rely on structural optimization, defined stow angles, and weather-responsive protection modes to maintain stability during extreme wind instances. Stiffness distribution, structural damping, and load transfer mechanisms continue to gain importance in tracker designs.

Wind-tunnel testing serves as a key validation method for assessing the tracker’s structural stability under challenging wind conditions. Physical wind-tunnel experiments simulate natural wind flows across tracker arrays, enabling estimation of stress distributions and the optimization of design parameters. Suppliers combine static load analysis with aeroelastic studies to assess dynamic effects such as flutter, vortex shedding, and galloping. These insights drive the development of adaptive stow algorithms that respond to real-time wind conditions.

In addition, Antaisolar developed numerical ‘digital wind tunnel’ simulations, in which physics-based computer models are used to simulate wind fields and the dynamic response of the tracker structure. This digital method provides input for iterative design optimization, according to the company.

Soltec says it heavily relies on wind-tunnel data and aeroelastic modeling to refine its control strategies. The company incorporates wind-tunnel results directly into its stow logic, enabling differentiated responses for various row types within the same project. Dynamic protection modes in its control software account for terrain-driven turbulence, wake effects, and other location-specific conditions (see Advanced Tracker Controllers And Algorithms In Solar Trackers).

All Axial tracker prototypes undergo aeroelastic wind-tunnel validation at CPP Inc., validating the stow strategies and the configuration of blocking elements, according to Axial’s Sejas. The company also offers a dynamic stow algorithm, iStow, which adjusts the allowable tracking range based on measured wind speed. Below 30 km/h, the tracker operates normally. It has a reduced rotational range at slightly higher wind speeds, between 30 and 40 km/h. For wind speeds above this threshold, the tracker transitions rapidly into full stow.

The text is an edited excerpt from TaiyangNews’ latest Market Survey on Solar Trackers 2026, which can be downloaded for free here.