Can home solar panels withstand hail or severe storms?

How Solar Panels Are Rated for Severe Weather

Residential solar panels are not delicate. Manufacturers understand they will be installed outdoors for decades and subject them to rigorous testing to earn specific certifications. The two most critical ratings for storm resilience are for hail impact and wind uplift.

For hail, panels are tested to withstand impacts from ice balls of specific diameters at designated speeds. A common and robust standard is the UL 61730 and IEC 61215 certifications, which often include a test for hail stones up to 1 inch (25 mm) in diameter striking at approximately 50 mph. Some premium panels are rated for even larger hail. For wind, the mounting system and roof attachment are as important as the panels themselves. Systems are engineered and installed to meet local building codes, which dictate wind load requirements often based on the region's historical data. A properly installed system can typically withstand winds of 140 mph or more, equivalent to a Category 4 hurricane.

Key Factors That Determine Real-World Durability

Certifications provide a baseline, but the actual performance of your solar array during a storm depends on several practical factors.

• Panel Quality and Manufacturer: Not all panels are created equal. Higher-tier manufacturers often use more durable tempered glass and robust frames. Review the product's datasheet for its specific hail and wind ratings.
• Installation Quality: This is arguably the most critical factor. Panels must be securely anchored to a structurally sound roof using mounting hardware rated for the local wind zone. Poor installation is a leading cause of storm-related failures.
• Roof Condition: Solar panels are attached to your roof. If the underlying roof is old, damaged, or improperly maintained, it becomes the weak link. A severe storm can compromise the roof itself, jeopardizing the entire solar installation.
• System Age and Maintenance: While panels have no moving parts, connections can loosen, and seals can degrade over time. Periodic professional inspections can identify potential vulnerabilities before a storm hits.

Steps to Protect Your Solar Investment

Proactive maintenance and preparation can significantly reduce storm risks. Follow this checklist to help ensure your system is ready.

1. Schedule Regular Inspections: Have a qualified solar technician inspect your system at least every 2-3 years, or after any major weather event. They will check mounting hardware, electrical connections, and the integrity of the panels.
2. Review Your Warranty and Insurance: Understand what your solar panel manufacturer's warranty covers regarding weather damage. Crucially, contact your homeowner's insurance provider to confirm your solar panels are included in your policy's coverage. They are generally considered a permanent part of the home.
3. Document Your System: Keep a file with your system's schematics, product model numbers, and installation certificate. Take clear photos of the entire array from multiple angles. This documentation is invaluable for insurance claims if damage occurs.
4. Maintain the Surrounding Area: Trim overhanging tree branches that could break and fall onto your panels during a high-wind event.

What to Do After a Severe Storm

Once it is safe to go outside, follow these steps to assess potential damage.

• Perform a Visual Inspection from the Ground: Use binoculars to look for obvious issues like cracked glass, displaced panels, or debris on the array. Do not climb onto a wet or damaged roof.
• Check Your Monitoring System: Most modern systems have an app that shows energy production. A sudden, permanent drop in output can indicate damage to a panel or electrical component.
• Do Not Touch the System: A damaged solar system can pose an electrocution hazard, even if the sun isn't shining. If you suspect any damage, turn off the system at the inverter AC disconnect switch if it is safe to access, and contact your solar installer immediately for a professional assessment.
• File an Insurance Claim Promptly: If damage is confirmed, contact your insurance company. Your installer can often provide the detailed repair estimate and documentation needed for the claim.

Modern solar technology is built to be durable. By choosing quality components, ensuring professional installation, and performing routine maintenance, homeowners can have confidence in their system's ability to weather severe storms. Always consult with your local installer about the specific wind and hail ratings appropriate for your area's climate and building codes.