Most solar panels survive typical hail without visible damage, but large hail, over roughly golf ball size or repeated strikes concentrated on one section of an array can crack glass and fracture cells beneath it. If a storm hits your system, the right first moves are simple: confirm the array is safe to leave alone, photograph everything before cleanup, and contact your installer and insurer before you assume the damage is cosmetic or nonexistent.
TL;DR:
- Panels certified to survive impact from 25 millimeter hail stones may still sustain internal microcracks from smaller impacts, which can go unnoticed visually.
- Hail causes more than half of insured solar energy system losses despite representing only 1% of claims, emphasizing its outsized financial impact in hail-prone regions.
- Infrared and electroluminescence imaging are essential tools for detecting hidden cell cracks that visual inspections often miss and can influence accurate damage assessment.
- Upgrading to modules with thicker, tempered glass and using automated high-angle stow systems significantly reduce the risk and severity of hail damage.
- Documenting all damage through timestamped photos, production logs, and professional inspections is crucial for successful insurance claims and preventing disputes over pre-existing damage.
Table of Contents
- How Likely Is Hail to Damage Solar Panels?
- How Does Hail Actually Damage a Solar Module?
- What Testing Standards Signal Real Hail Resistance?
- How Can You Reduce Hail Damage Risk?
- What Should You Do After a Hailstorm?
- Does Insurance Cover Solar Panel Hail Damage?
- Vector’s Perspective: Evidence-First Inspections and Documentation
- Request a Second Opinion on Your Hail Claim
- Sources
- FAQ
How Likely Is Hail to Damage Solar Panels?
Panel resilience depends heavily on hailstone size and impact energy, not just the storm’s overall intensity. Standard certification testing simulates ice balls around 25 millimeters, roughly 1 inch, striking at a set velocity, and most commercially available modules pass that bar without issue. Advanced test sequences from labs like PVEL push stones to 40 or 45 millimeters, closer to what a severe convective storm can actually produce, and that’s where the PVEL hail stress sequence shows meaningful separation between module designs.
Hail events themselves are statistically uncommon compared to wind or routine wear, yet they carry outsized financial weight. Industry data shows hail accounts for about 1% of filed solar claims but drives more than half of total insured losses in the sector. That imbalance matters if you own property in a hail-prone corridor.
A few regional patterns worth knowing:
- Nebraska, Iowa, Colorado, and Texas sit inside or near the country’s most active hail belt.
- Florida sees fewer large-hail events but faces frequent severe convective storms overall.
- Severe convective storm activity, including hail, has been driving larger insured losses across recent years, reshaping how insurers price solar risk.
How Does Hail Actually Damage a Solar Module?
Hail damage splits into two categories, and only one of them is easy to spot. Visible damage looks like shattered or spider-webbed glass, usually from a direct hit above a certain impact threshold. Invisible damage is a different story entirely: cell-level microcracks that spread in dendritic, branching patterns across the silicon without breaking the glass on top.
Government researchers have found that hail can crack solar cells at diameters and speeds below what’s needed to break the glass, which is exactly why a panel can look untouched after a storm and still be quietly losing output. The DOE’s FEMP program recommends infrared and electroluminescence imaging specifically because visual inspection alone misses this category of damage.
A large-scale electroluminescence study analyzed roughly 4,000 hail-struck panels and found that visible glass breakage significantly underestimated total internal damage. Many modules with fully intact glass still showed serious cell fractures under EL imaging.
A few other things to watch for:
- Repeated small strikes in one zone of an array can compound into damage that no single impact would cause alone.
- Rough handling during installation or maintenance sometimes leaves drag marks on cells that mimic hail cracking. This is worth ruling out with your installer.
- Sudden production drops or unexplained thermal hot spots picked up on infrared scans are early warning signs of hidden cracking, and in rare cases, hot spots can pose a fire risk if left unaddressed.
What Testing Standards Signal Real Hail Resistance?
Not all “hail-tested” panels are tested equally, and the paperwork behind that claim matters more than the marketing language on a spec sheet. Base-level IEC and UL certification requires modules to survive a 25 millimeter ice ball impact, which confirms baseline durability but says little about performance in a severe hail event.
Advanced sequences from organizations like PVEL, RETC, and FM Global test modules at higher energies and often combine hail impact with thermal cycling and mechanical load, closer to what a module actually experiences over a service life. Glass thickness plays a direct role here: fully tempered glass around 3.2 millimeters generally outperforms thinner heat-strengthened alternatives in these advanced sequences, according to PVEL’s testing white paper.
Before you buy or approve a project, ask for:
- Documentation showing which specific hail test sequence a module passed, not just a pass/fail certification badge.
- The glass thickness and tempering method used in that module’s construction.
- Frame and mounting specifications, since a weak frame can transmit stress into the glass even when the glass itself is rated well.
- Module size and format, since larger-format panels have shown greater vulnerability under high-energy impact testing in some industry analyses.
How Can You Reduce Hail Damage Risk?
Mitigation works, and the data on it is more encouraging than most owners realize. Reducing exposure comes down to a mix of what you install and how you operate it during a storm.
- Choose durable module specs upfront. Fully tempered glass, reinforced frames, and modules that carry advanced hail-test documentation cost more but reduce claim severity when storms do hit.
- Use hail stow on tracker systems. Tilting trackers to a steep angle, often 75 degrees or higher, before impact substantially cuts breakage probability compared with a shallow 30 degree resting angle, per modeling cited in industry reporting.
- Pair stow systems with reliable forecasting. Automated stow triggers tied to weather alerts remove human reaction lag, which is often the difference between a stowed array and a damaged one.
- Weigh retrofit costs against claim history. If your property sits in a known hail corridor and has filed prior claims, upgrading glass or adding stow automation may offset future deductible and premium exposure over time.
Pro Tip: Ask your installer to capture baseline electroluminescence or infrared images at commissioning. Without a baseline, it’s much harder to prove that damage found after a storm wasn’t already there.
What Should You Do After a Hailstorm?
Safety comes before documentation, every time. If you see shattered glass, exposed wiring, or any sign of electrical compromise, power down the system and stay away from the array until a qualified technician confirms it’s safe to approach.
Once the array is safe, inspection timing and method both matter. A visual walk-through catches obvious cracking, but it won’t catch the microcracks discussed earlier. Infrared scans reveal thermal hot spots tied to larger electrical faults, while electroluminescence imaging shows the cell-level cracking patterns that neither visual inspection nor IR alone will find. Comparing post-storm images against baseline imaging from installation, when available, is the clearest way to separate storm damage from anything that existed before, a point national lab researchers have emphasized in field studies.
Build your documentation file the same day if possible, and see this hail damage inspection checklist for a fuller walkthrough.
| What to collect | Why it matters |
|---|---|
| Timestamped photos of all sides of the array | Establishes when damage was first observed |
| Production logs before and after the storm | Shows measurable output loss tied to a specific date |
| Installer or technician inspection report | Provides a professional record separate from your own observations |
| Preserved damaged panels, if feasible | Allows later testing rather than relying on memory or photos alone |
Does Insurance Cover Solar Panel Hail Damage?
Homeowners and commercial property policies typically treat hail as a covered peril, but coverage details vary by carrier, policy age, and whether the system is scheduled as a separate item or folded into dwelling coverage. Reading your policy’s specific language on solar equipment, rather than assuming standard roof coverage applies automatically, is worth the time before a storm ever hits.
Three issues come up often once a claim is filed:
- Insurers sometimes attribute cracking to prior manufacturing defects or wear rather than storm impact, which is exactly why baseline imaging and documented maintenance history matter.
- Damage from installation handling can resemble hail cracking, and carriers may push back if that distinction isn’t addressed with clear evidence.
- Initial adjuster estimates sometimes reflect only visible glass damage and miss the internal cell cracking that electroluminescence imaging would catch, leading to underpriced settlements.
If you’re filing a claim, notify your insurer promptly, request a professional inspection that includes imaging beyond a visual check, and keep every record from the essential documents for hail damage claims list. A second opinion is worth considering if the initial estimate seems inconsistent with what your own documentation shows.
Vector’s Perspective: Evidence-First Inspections and Documentation
Most disputes over hail-damaged solar systems come down to one question: did this damage exist before the storm, or because of it? Baseline imaging answers that question before it becomes an argument. At Vectorclaimsolutions, we’ve found that structured documentation, EL and IR imaging paired with timestamped records, gives both policyholders and carriers a clearer basis for agreement rather than assumption. When an initial estimate seems thin relative to the visible and imaged evidence, a second opinion or public adjuster review can clarify whether the gap reflects missed damage or a genuine coverage limit.
— Vector
Request a Second Opinion on Your Hail Claim
Our firm works with property owners who want a documentation-first review before accepting an initial estimate, rather than rushing to settle. If your solar array took a hit and the adjuster’s number feels disconnected from what you’re seeing on your production logs or panel surfaces, a second-opinion review can identify what may have been missed.
A review typically starts with triaging what documentation you already have, photos, production data, prior inspection reports, then flagging where additional imaging or testing might strengthen your position. From there, we walk through recommended next steps specific to your policy and claim status. Explore our hail damage claim review services or check our inspection checklist to see what to gather before you call. For commercial arrays, our commercial claims overview walks through what a process review covers. If you’re coordinating repairs alongside a roofing or HVAC contractor, Ricotta’s contractor services may be a useful resource for related property work. Start by requesting a claim review to see where your documentation stands.
This article is general information, not a substitute for advice from a qualified financial advisor. Consult a qualified financial professional about your own circumstances before acting on anything here.
Sources
- Hail Damage Mitigation for PV Systems — U.S. Department of Energy (FEMP)
- EL imaging analysis of hail-damaged solar panels — IEEE (2022)
- PVEL hail stress sequence white paper — PVEL
FAQ
How Big Does Hail Need to Be to Damage Solar Panels?
Standard certification tests use roughly 25 millimeter, about 1 inch, ice balls, but hail closer to 40 to 45 millimeters, tested in advanced sequences like PVEL’s, is where real-world damage risk rises sharply. Even smaller hail can cause invisible cell microcracks without breaking the glass at all.
Can Hail Damage Solar Panels Even if the Glass Looks Fine?
Yes. Research on hail-damaged arrays found that visible glass breakage significantly underestimated total internal damage, with many intact-looking panels showing cell cracking under electroluminescence imaging.
Does Homeowners Insurance Cover Solar Panel Damage From Hail?
Most homeowners and commercial policies treat hail as a covered peril, but coverage specifics depend on how the system is scheduled in your policy and your carrier’s language. Reviewing your policy and documenting damage thoroughly, including with imaging beyond a visual check, strengthens your position if a claim is disputed.
Why Is It Difficult to Sell a House With Solar Panels?
Undocumented or unresolved hail damage can complicate a sale because buyers and lenders may question the system’s remaining performance and warranty status. Keeping baseline and post-storm inspection records on file helps demonstrate the system’s condition to a future buyer.