Rethinking Hail Resilience: A System-Level Approach to Protecting Utility-Scale Solar Assets
By Kevin Krautbauer, Principal Engineer of Automation & Trackers, FLEXRACK by Qcells
Key Takeaways
Hail accounts for a disproportionate share of solar asset losses.
Tracker stow angle is only one factor in hail mitigation.
Higher stow angles can increase structural and foundation costs.
Effective resilience requires coordinated module, tracker, controls, and operations strategies.
System-level optimization can improve both protection and project economics.
As Solar Expands, Protecting Assets Matters More than Ever
Solar deployment continues to expand into regions with diverse environmental conditions. According to kWh Analytics' 2025 Solar Risk Assessment, hail accounted for 73% of total financial losses by damage amount in its solar loss database, despite representing only 6% of loss incidents.[1] This disproportionate impact underscores the importance of protecting assets while preserving the performance and economics needed for long-term project success.
Single-axis trackers can help reduce hail damage risk by moving modules into protective stow positions before severe weather arrives. Whereas hail mitigation once relied heavily on manual operator action, modern systems can integrate weather monitoring with automated tracker controls for a timelier and more consistent response. Effective hail resilience, however, extends beyond tracker positioning: it requires coordinated decisions about module durability, structural design, controls, and operations.
Steeper module tilt can reduce exposure to direct hail impacts by changing the angle of incidence. This has encouraged tracker designs with hail-stow angles beyond the conventional 50–60° range, including some exceeding 75°. Yet stow angle alone does not determine protection. Actual outcomes also depend on hail size and trajectory, wind, module construction, and the behavior of the full system.
Higher stow angles can also introduce design tradeoffs. To ensure proper ground clearance, higher stow angles will require the tracker to be taller (shown in the above illustration), which may also drive higher wind loads on the system. Preliminary engineering modeling indicates that increasing maximum tracker tilt from 55° to 75° could require approximately 70–100% more foundation cost, detailed in the below table, under the modeled design conditions.[2] The increase in foundation material reinforces the importance of evaluating hail resilience alongside overall system cost and performance.
Tracker Max Tilt | Foundation Cost |
55° | 3.75¢/W |
60° | 4.8¢/W |
75° | 6.5-7.5¢/W |
Hailstorms are dynamic: wind speed and direction, storm paths, and hail trajectory can change rapidly. Tracker positioning alone cannot address every impact scenario. For developers, the challenge is therefore not to maximize any one specification, but to balance resilience, reliability, constructability, energy production, and long-term project value across the entire system.
Balancing Risk, Performance, and Project Economics
In a market driven by project returns, developers must evaluate how complete systems perform and not simply compare individual components. A higher-tilt tracker or a more hail-resistant module may offer advantages, but each choice can carry cost, complexity, and design implications. The goal is an integrated solution that balances risk reduction with performance and project economics.
FLEXRACK by Qcells approaches hail resilience by evaluating how modules, trackers, controls, and foundations work together. Drawing on Qcells' capabilities in module manufacturing, tracker design, and EPC execution, the team can consider technology, constructability, and cost as interconnected design decisions. An important element of this strategy is Qcells' hail-resistant dual-glass module architecture, designed with fully tempered 2.5 mm glass on both front and rear surfaces. This construction is intended to improve resistance to hail impacts while supporting greater flexibility in system-level design.
The Q.Track™ tracker platform complements this module strategy through intelligent controls and weather monitoring. Q.Track can automatically command modules to move to a predetermined hail-stow position when defined severe-weather conditions are detected within a configurable area around the site. This approach is intended to provide time for a protective response ahead of storm arrival, subject to forecasting accuracy, site configuration, and operating conditions.
Together, hail-resistant modules and responsive tracker controls offer a more balanced mitigation strategy than relying on maximum stow angle alone. This integrated approach creates opportunities to manage hail exposure while evaluating the structural requirements, energy-production implications, and costs of each design. Site-specific engineering and risk analysis remain essential to determining the right configuration.
By considering performance, risk, and cost at the system level, FLEXRACK aims to help project owners strengthen weather resilience without losing sight of overall project value.
The Future of Hail Mitigation
As solar development expands into new geographies, durability and asset protection will remain central to project design. Improvements in module construction, weather intelligence, tracker controls, and operational practices will provide more options for reducing hail exposure. The next step is to assess these capabilities as a coordinated system rather than as isolated product features.
For FLEXRACK, that means evaluating resilience alongside reliability, constructability, energy performance, and economics. Developers can make better-informed decisions when they understand how each design choice affects the whole project.
With expertise spanning modules, trackers, and EPC execution, FLEXRACK is positioned to support that broader evaluation. The most resilient projects will not necessarily be those with the steepest stow angles or the strongest individual modules, but those that align the right technologies, controls, and operating strategies with site-specific risks.
The future of hail resilience is not defined by any single component. It depends on how effectively the entire system works together.
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[1] kWh Analytics, Solar Risk Assessment 2025, p. 5. https://kwhanalytics.com/wp-content/uploads/2025/06/Solar-Risk-Assessment-2025.pdf
[2] These estimates are based on internal engineering calculations and have not been independently validated; actual requirements will vary with site conditions and structural design.
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