Are Solar Panels Hail Resistant? What Homeowners Need to Know

Bottom line up front: Standard solar panels are certified to survive 1-inch hail (about the size of a quarter) hitting at 51 mph, because every panel sold in the US has to pass that test to get UL certification. Golf-ball or baseball-sized hail is a different story — that can crack glass and damage cells even on a certified panel. The real risk isn't whether your panels can handle a normal storm (they can); it's whether you live somewhere that gets the abnormal kind, and whether your insurance and installer contract account for it.

The Hail Test Your Panels Already Passed

Every solar panel sold in the United States has to pass IEC 61215 testing before it can carry a UL certification, and that testing includes a hail impact test. The standard: a 1-inch diameter ice ball, fired at 51 mph (23 meters per second), hitting the panel at up to 11 different points. To pass, the panel can't have any cracks that expose the electrical components, and its power output can't drop by more than 5%.

That 51 mph number isn't arbitrary. It's roughly the terminal velocity of a 1-inch hailstone falling from a storm cloud — meaning the test simulates the worst-case impact a quarter-sized hailstone could actually deliver in nature, not some watered-down lab approximation.

For context, most hail that falls in the US is smaller than an inch. According to NOAA's severe weather records, roughly 70% of hail reports fall in the "quarter-sized or smaller" range. If that's the storm profile in your area, your panels are already built for it — no upgrade needed.

Where the Rating Runs Out

The problem is the other 30%. Hail forms in layers as it's tossed up and down inside a thunderstorm updraft, and in strong enough storms, stones can grow to golf ball (1.75 inch), baseball (2.75 inch), or even softball size (4+ inch). At that size, both the terminal velocity and the mass of the impact increase dramatically — a golf-ball stone hits with roughly 3-4 times the kinetic energy of a quarter-sized one.

Panel glass is tempered, similar to a car windshield, and tempered glass is genuinely tough. But tempered glass has a breaking point, and large hail routinely exceeds it. When a panel's front glass cracks, three things can happen:

• Cosmetic cracking only — a spiderweb crack that doesn't reach the cells underneath. Power output is usually unaffected, but moisture can eventually seep in through the crack over months or years.
• Cell damage — the impact reaches the silicon cells and creates microcracks, which show up as gradually declining output over the following months rather than an immediate failure.
• Full glass failure — the panel is compromised enough that it needs replacement, and continuing to run it risks electrical exposure.

Insurance adjusters and installers can usually tell the difference with an electroluminescence (EL) scan, which lights up microcracks invisible to the naked eye. If you've had a serious hailstorm and your panels look fine from the ground, an EL scan is worth asking for before you assume everything's okay — cell-level cracking doesn't always show on the surface.

Hail Alley: Where This Actually Matters

If you're in one of these areas, hail durability should be part of your buying decision, not an afterthought:

• Texas, Oklahoma, Kansas, Nebraska, Colorado, and Wyoming make up what meteorologists call "Hail Alley," where large hail (1+ inch) is common enough that some insurers apply separate wind/hail deductibles specifically because of it.
• The Front Range of Colorado (Denver to Colorado Springs) sees some of the highest hail frequency in the country, driven by the collision of moist Gulf air with mountain-cooled updrafts.
• The Southeast, including parts of Georgia, Alabama, and the Carolinas, sees fewer hail events but occasionally produces very large stones during severe spring storm systems.

If you live in one of these regions, ask your installer directly what hail rating their panel model carries beyond the baseline UL certification — some manufacturers publish an enhanced rating (1.5-inch or 2-inch hail tested) for exactly this market.

Panels Built for Bigger Hail

A handful of manufacturers test and market panels specifically for higher hail resistance, generally by using thicker front glass (3.2mm instead of the more common 2.0mm) or dual-glass construction instead of glass-on-backsheet:

• Thicker tempered glass (3.2mm+): Adds weight and cost but meaningfully raises the impact threshold before cracking.
• Dual-glass panels: Glass on both the front and back of the cell layer instead of a polymer backsheet. These are inherently more rigid and are increasingly standard on premium residential panels.
• Panels with published 2-inch (or larger) hail ratings: A few manufacturers test beyond the UL minimum and publish the larger rating on their spec sheet. If you're in Hail Alley, this is the number to ask for — not just "is it UL certified," since that's true of nearly every panel on the market.

None of this shows up automatically on a standard quote. You typically have to ask the installer for the manufacturer's spec sheet and look at the hail rating line item yourself, or ask them directly which hail-tested option they'd recommend for your climate.

How to Compare This When You're Shopping

This is exactly the kind of detail that's easy to miss when you're comparing quotes on price alone, and it's also exactly the kind of question a single local installer may not want to volunteer if their default panel doesn't have a strong rating. Getting quotes from multiple licensed installers gives you a natural way to ask the same question across several options and see who has a real answer versus a shrug.

EnergySage lets you request quotes from vetted, licensed installers in your area side by side, which makes it easy to ask each one directly: "What's the hail rating on this panel, and do you offer a dual-glass or thicker-glass option?" Installers who work in hail-prone regions regularly will usually have a confident answer; if they don't, that's useful information too.

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The Bottom Line

For the vast majority of US homeowners, solar panel hail resistance is a solved problem — every certified panel already survives the kind of hail that actually falls in most places. The exception is homeowners in genuine hail-prone regions (Texas, Oklahoma, Colorado's Front Range, and similar areas), where it's worth specifically asking installers about dual-glass construction and enhanced hail ratings rather than assuming the UL minimum is enough.

The 15-minute version of this advice: if you live in Hail Alley, ask about the glass. Everyone else can move on to the next item on their solar checklist.

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Have questions about solar panel durability or your specific region's hail risk? Drop them in the comments below or contact our team. We read every message.

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