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Solar Under Storm III: Updated Best Practices for Resilient Ground-Mount PV Systems with Hurricane Exposure

RMI’s report highlights the increasing vulnerability of solar installations in hurricane-prone regions due to climate change and growing reliance on solar energy. Key findings from Hurricane Beryl (2024) and other storms reveal critical failure modes in ground-mount systems, including module frame fatigue, inadequate bolt connections, and undersized racking. Updated best practices focus on:

🛠️ Specifications:

• Use high-load modules (4,000 Pa uplift).
• Employ through-bolting with locking solutions and specialized washers (e.g., StormPlate™).
• Reinforce foundations with dual-post designs and ensure proper topographic considerations.
• Bypass trackers and self-tapping screws in high-risk zones.

🤝 Collaborations:

• Partner with suppliers for dynamic load testing and third-party audits.
• Join the PV Resiliency Working Group for shared learning.

🔧 Root Causes:

• Failures stem from material weaknesses (thin module frames), poor installation (shared clamps), and unaddressed topography.
• Low-cycle fatigue in module frames is a major concern, exacerbated by larger, less robust panels.

📝 Recommendations:

• Adopt performance-based engineering aligned with ASCE 7 and hurricane-specific codes.
• Prioritize quality inspections and QA/QC processes during construction.

The report emphasizes balancing economic viability with resilience, urging industry stakeholders to validate designs through rigorous testing and collaborative efforts.
Users: https://rmi.org/insight/solar-under-storm