Hail storms are among the most destructive events for solar plants in India. States like Rajasthan, Gujarat, Madhya Pradesh, and Uttar Pradesh see seasonal hail storms that can damage thousands of solar panels in minutes. The problem is that most hail damage is invisible to the naked eye — the panels look fine, but micro-cracks formed inside the cells are silently reducing your generation every day.
What Hail Does to Solar Panels
- Micro-cracks in solar cells — invisible on the surface, detected only by EL testing
- Glass surface pitting — reduces light transmission and creates soiling accumulation points
- Junction box damage — impact can crack junction box covers
- Frame denting — cosmetic damage that can affect panel sealing long-term
- Encapsulant delamination — starts at impact points, spreads over time with UV exposure
- Complete glass breakage — rare but possible for large hailstones (>2.5 cm)
Why Micro-Cracks Are the Biggest Concern
A solar panel with micro-cracks can still generate electricity — which is why plant operators often miss the damage. But cracked cells produce significantly less power per cell, and over time the cracks propagate further with thermal cycling (day/night temperature changes). A panel with 20% of its cells micro-cracked can lose 15–25% of its generation capacity permanently. Across a 10 MW plant, this translates to ₹30–80 lakh in annual generation loss.
What to Do Immediately After a Hail Storm
- 1. Do a visual walk of the plant within 24 hours — document any visible glass breakage or obvious panel damage with photos
- 2. Check your SCADA/monitoring system — look for string-level generation drops that indicate severe damage
- 3. Do NOT restart damaged strings without inspection — short circuits in cracked panels can cause fires
- 4. Contact your insurance provider immediately — most policies require prompt damage notification
- 5. Schedule EL + thermal drone inspection within 2 weeks — this is essential for insurance claims
- 6. Document the storm event — save weather data, radar screenshots, and timestamped plant monitoring data
Why You Need EL Testing (Not Just Thermal) After Hail
Thermal imaging is excellent for detecting electrically active faults — hotspots, string failures, and bypass diode failures. But freshly hail-damaged panels often have micro-cracks that are not yet generating excess heat because the crack pattern has not fully disrupted the circuit. EL testing reveals these cracks immediately, regardless of whether they are yet causing a thermal signature. This is why post-hail inspection must include EL testing for a complete damage assessment.
Insurance Claims After Hail Damage
Most solar plant insurance policies cover hail damage but require a professional inspection report as evidence. Varuna Aerotech's post-hail inspection reports include thermal + EL findings, GPS-referenced damage maps, severity classification, estimated generation loss, and replacement cost estimates — the complete documentation package required by insurance adjusters. We have experience supporting insurance claims for solar plants across Rajasthan, Gujarat, and Madhya Pradesh.
Frequently Asked Questions
How soon after a hail storm should I get an inspection?
Ideally within 2 weeks. Insurance policies typically require prompt damage notification and documentation. Waiting longer allows crack propagation and makes it harder to prove the storm was the cause.
Can I claim EL testing cost from insurance?
In most cases yes — inspection costs are claimable as part of the loss assessment process. Ask your insurer to confirm before booking.
Will Varuna Aerotech provide an insurance-ready report?
Yes. Our post-storm inspection reports are designed specifically for insurance submissions — including thermal + EL findings, GPS damage maps, and estimated replacement value.
