How Durable Are Solar Panels? Hail, Wind & Storms
Straight answer: quality solar panels are engineered and lab-tested to shrug off ordinary weather. They’re impact-tested against roughly 1-inch (25 mm) hail at about 50 mph, and the racking is engineered to your site’s code wind load. In Southern California severe hail is rare — Santa Ana winds, flying debris and wildfire ash matter more. Here’s what panels survive, what actually damages them, and who pays if a storm does.
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- Certified panels pass the IEC 61215 hail-impact test (with UL 61730 covering safety listing) — roughly 1-inch (25 mm) ice balls at about 50 mph — and must keep nearly all their output.
- Wind resistance is mostly the racking and roof attachments, engineered to your site’s code wind load — a permit and engineering item, not a panel spec.
- Real-world hail damage is rare: NREL logged one broken panel out of 3,000+ in a golf-ball-sized Colorado hailstorm.
- In SoCal the bigger threats are wind-driven debris and wildfire ash. Storm damage is usually a home-insurance claim — impact and hail may be excluded from the product warranty, depending on the written warranty.
How tough are solar panels, really?
A modern panel isn’t fragile glass — it’s a sealed sandwich of tempered front glass (usually ~3.2 mm), encapsulant, cells, a backsheet, and a stiff aluminum frame. To earn its listing it has to survive a battery of abuse tests, not just work on a sunny day.
The two standards that matter are IEC 61215 (design qualification) and UL 61730 (safety). Between them, a panel is thermal-cycled between deep cold and heat, soaked in damp-heat, loaded front and back to mimic wind and snow pressure, blasted with UV, and pelted with ice balls. Panels that pass are built to hold up outdoors for 25–30 years. That doesn’t make them indestructible — large hail, flying debris, and careless handling still cause damage — but ordinary Southern California weather is well inside what they’re engineered for.
Weather threats vs. how panels are rated
Different threats are handled in completely different ways — some by the panel itself, some by the racking and permit, some only by your insurance. Here’s the map, and what to actually check for each.
| Threat | How panels are rated / protected | What to check |
|---|---|---|
| Hail | IEC 61215 hail-impact test: ~1-in (25 mm) ice balls at ~50 mph at 11 spots; tempered front glass. | Confirm the module carries IEC 61215 + UL 61730 listing; in hail-prone spots ask about a higher hail-tested class. |
| Wind (incl. Santa Ana) | Not a panel spec — the racking & roof attachments are engineered to the site’s code wind load (the ASCE 7 edition your AHJ adopts). | Ask that the permit set includes a wind-load calc / engineering; UL 2703 racking covers bonding & fire, not site wind adequacy. |
| Flying debris / branches | No dedicated test — impact resistance comes from the tempered glass and frame. | Trim overhanging limbs before install; this damage is usually a home-insurance matter, not the panel warranty. |
| Heat & UV over decades | IEC 61215 thermal-cycling, damp-heat and UV tests; a rated temperature coefficient and a slow ~0.3–0.5%/yr aging curve. | See the performance-warranty terms; details in our degradation and heat guides. |
| Dust & wildfire ash | Not “damage” — a soiling / output issue, mostly rinsed by rain or a cleaning. | Inspect after ashfall; safe-cleaning tips in our maintenance guide. |
Sources: U.S. DOE — Hail Damage Mitigation for PV · EnergySage. Standards and code editions vary by manufacturer, project and AHJ — verify on the equipment listing and permit set.
Hail: what the impact test actually simulates
The headline number people quote for hail comes from the IEC 61215 impact test.
In that test, a machine fires ~1-inch (25 mm) ice balls at roughly 23 m/s — about 50 mph — at 11 points across the panel, including cell centers, edges and corners. To pass, the module can’t show cracks or lose more than a small slice of its rated power. That’s a solid stand-in for the moderate hail most of the country sees, and Southern California sees severe hail very rarely.
Real-world data backs it up. When a golf-ball-sized hailstorm hit the Denver area in May 2017, the National Renewable Energy Laboratory had more than 3,000 panels on and around its main building — and exactly one broke. Real-world hail damage severe enough to require replacement is uncommon, though not impossible. The honest caveat: very large or repeated hail can leave micro-cracks you can’t see, which may slowly trim output — so after a serious storm it’s worth a production check, not just a glance from the ground.
Wind: it’s the racking, not the panel
A panel doesn’t “blow off” on its own — when wind-related failures occur, attachment design, racking, roof condition and install quality are the important factors. That’s why wind resistance is designed in at the racking and roof-connection level, not printed on the module.
On a permitted job, the mounting system and its roof anchors are engineered to the code wind load for your specific site — the wind-speed map, exposure and roof zone from the ASCE 7 edition your local building department (AHJ) has adopted, often confirmed on a PE-stamped structural sheet. A UL 2703 listing on the racking covers bonding, grounding and roof-assembly fire rating — it does not by itself prove the attachment is strong enough for your wind zone. Applicable code editions, your AHJ, exposure and equipment all vary, so final adequacy is a code-review item, not a fixed rule. On tile roofs the attachment detail matters even more — see solar on clay-tile roofs.
For SoCal, the wind that counts is the Santa Ana — dry, gusty offshore events that can also fling branches and debris. A correctly engineered array rides those out; attachment design, racking, roof condition and installation quality are the important factors when wind-related failures occur — one more reason attachment quality is worth checking up front.
Heat, UV, and the slow stuff
Storms are dramatic; the bigger long-run wear is quiet. Sun and heat age a panel gradually rather than breaking it.
We cover the slow side in its own guides so we won’t rebuild it here: how output edges down about 0.3–0.5% a year in solar panel degradation, how hot Valley rooftops shave a little midday production in heat and solar output in LA, and how dust and ash are a cleaning issue in solar maintenance. This article is about the physical, weather-event side — hail, wind and debris — which those three don’t cover.
What actually damages panels
Certification failures are rare, so when a panel really is hurt, it’s usually one of these — and most are avoidable.
Large or repeated hail
Beyond the ~1-inch test size — or many hits in one spot — glass can crack or micro-crack. Rare in SoCal, common enough in hail country to warrant a hail-rated module.
Flying debris & branches
A wind-thrown limb or launched object hits harder than hail. Trimming trees near the array is the cheapest protection there is.
Improper install
Too few attachment points, wrong spans, or anchors into weak framing turn a normal wind event into a failure. Engineering and workmanship do the heavy lifting.
Walking on panels
Foot pressure — during a careless service call or roof work — is a classic cause of hidden micro-cracks. Panels are stepped around, not on.
Water & edge intrusion
Damaged seals or a cracked backsheet let moisture in over time, causing corrosion or hot spots. Usually a downstream effect of impact or a bad install.
Wildfire ash build-up
Ash won’t break glass, but a thick, baked-on layer cuts output until it’s rinsed — a maintenance issue, not structural damage.
Here, wind and ash beat hail
SoCal rarely sees the severe hail that worries the Midwest. The realistic weather stresses are Santa Ana wind and wind-borne debris, wildfire ash and soot, and everyday dust. That shifts what matters: a properly engineered, well-attached array and a post-storm production check do more for durability here than chasing the highest hail rating. Note too that high-wind events tied to fire risk can trigger PSPS outages — a grid issue, not panel damage.
Insurance vs. the warranty: who pays for storm damage
This trips up a lot of homeowners. The manufacturer’s warranty and your home insurance cover different things, and storm damage usually lands on the insurance side.
A panel’s product warranty covers manufacturing defects; the performance warranty covers output as it ages. Damage from an outside force — hail, a flying branch, someone walking on the glass, transport, or a bad install — may be excluded, depending on the exact written warranty. So a storm crack is often not a warranty claim. We break the four warranty types down in solar warranties explained.
Rooftop panels permanently attached to your home are generally covered under your homeowners policy’s dwelling coverage, much like the roof itself — but coverage isn’t universal. Some policies exclude or apply a separate, higher deductible to wind and hail, especially in high-risk areas. The only reliable answer is to read both documents: your written warranty and your home-insurance policy. Before you sign a solar contract, it’s worth a quick call to your insurer to confirm the panels are covered and at what deductible.
A 3-minute durability check
1) Confirm your panels carry IEC 61215 + UL 61730 listings. 2) Ask your installer whether the permit set included a site wind-load calc. 3) Read your written warranty for impact/hail exclusions. 4) Call your home insurer to confirm storm coverage and deductible. These are estimates and general information, not guarantees — your equipment, AHJ and policy decide the specifics.
Frequently asked
Can solar panels survive hail?
Usually, yes. Certified panels pass the IEC 61215 hail-impact test — roughly 1-inch (25 mm) ice balls at about 50 mph at 11 spots — and real-world damage is rare. NREL had one broken panel out of 3,000+ in a golf-ball hailstorm, and severe, replacement-level hail damage is uncommon. Very large or repeated hail can still cause hidden micro-cracks, so a production check after a severe storm is smart.
Can Santa Ana winds blow solar panels off the roof?
A properly permitted array shouldn’t. Wind resistance lives in the racking and roof attachments, which are engineered to your site’s code wind load (the ASCE 7 edition your AHJ adopts). Attachment design, racking, roof condition and installation quality are the important factors when wind-related failures occur, not the panels themselves. Applicable code, exposure and equipment vary, so final adequacy is confirmed during code review — ask that your permit set includes a wind-load calc.
Does my solar warranty cover hail or storm damage?
Often not. The product warranty covers manufacturing defects and the performance warranty covers aging output — but damage from an outside force like hail, debris, or someone walking on the glass may be excluded, depending on the written warranty. Read your specific warranty document, and treat storm damage as a possible home-insurance claim rather than a warranty one.
Does homeowners insurance cover solar panel storm damage?
Generally, rooftop panels attached to your home are covered under your policy’s dwelling coverage, similar to the roof. But it isn’t universal — some policies exclude wind/hail or apply a separate, higher deductible, especially in higher-risk areas. Confirm with your insurer before you install, and check the deductible. This is general information, not insurance advice.
Does wildfire ash damage solar panels?
Ash won’t crack the glass, but a thick, baked-on layer cuts output until it’s rinsed off — a soiling issue, not structural damage. California’s winter rain clears most soiling for free; after heavy ashfall a gentle rinse or a professional clean restores production. Our maintenance guide covers doing it safely.
How long do solar panels last against the weather?
Panels are built to hold up outdoors for 25–30 years, and many keep producing past that. The wear over time is mostly slow aging — about 0.3–0.5% a year — not weather breakage. See degradation over time and, for hot-roof effects, heat and solar output in LA.
Related reading
Sources & methodology
Figures on this page come from the primary sources below and, where noted, from Cali Energy calculations using the stated assumptions. Rates, incentives, and program terms change; each was verified July 15, 2026.
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Get a free estimatePrepared by Cali Energy, July 15, 2026. This article is for general educational purposes only and is not legal, tax, financial, engineering, or utility advice. Rates, incentives, codes, permit requirements, equipment specifications, prices, and program terms may change; figures and timelines are estimates, not guarantees. Confirm current requirements with the applicable utility, AHJ, program administrator, manufacturer, or a licensed professional. See our Content Disclaimer. Cali Energy · 19201 Parthenia St, Unit E, Northridge, CA 91324 · CSLB #1032379 (B, C-10, C-39)