Canadian weather gives solar equipment a thorough test. Snow load, hail, high winds, freezing rain and the odd wildfire season all show up somewhere in the country. Panels sit outdoors for decades, so it makes sense to ask how they cope.
What panels are tested for
Residential panels sold in Canada should carry recognised certification marks, such as those from CSA or equivalent bodies. Certification testing generally includes mechanical load tests, impact tests with ice balls fired at the glass and temperature cycling. The details vary by standard and product, and spec sheets list the ratings, often as a maximum snow or wind load in pascals and a hail impact test at a stated size and speed.
These tests cover a standard event. They do not guarantee survival against every storm. A hailstone much larger than the test size can crack the glass, and so can a branch thrown by a strong wind. Reading a spec sheet is a skill, and our guide on efficiency, wattage and spec sheets helps with the format.
Hail
Hail is the weather risk people ask about most, particularly on the Prairies and in southern Alberta, where severe summer storms are well known. Panels are made from tempered glass, which is tougher than ordinary window glass. In many storms the panels are fine and the shingles or siding take the damage first.
If hail does cause damage, you might see cracked glass, reduced output or a distinct pattern of broken cells, though some micro-cracking is invisible. Photograph everything, and do not touch damaged panels, because broken glass over live wiring is a hazard. For regional specifics, see our Alberta guide.
Wind
Wind loads act on both the panels and the structure holding them. Uplift is the main concern, because the array can behave like a sail. The racking is designed to resist it, and the roof attachment must be fastened into structural members. Poor installation, not a bad panel, is the usual root cause of wind damage.
Ask your installer how they checked local wind and snow loads, whether the racking has been engineered for your site, and who signs off on the design. Permits and inspections exist partly to confirm this, which we explain in permits and inspections.
Ice and snow loads
Freezing rain can add weight and glaze the glass. Wet snow adds load too. Panels are rated for a specific load, but your roof also has a rating. If your roof is old or marginal, address that first. The structural check should be part of the design, and the roof suitability checklist gives you questions to ask. Shedding behaviour and safe removal are covered in snow on panels.
Lightning and surges
Panels do not draw lightning, but a nearby strike can send a surge along wires. Grounding and bonding are code requirements, and many installers add surge protection at the inverter or panel. Ask what protection is included and whether it is separate from the protection already on your electrical panel.
Wildfire smoke and ash
Heavy smoke reduces sunlight and cuts output until the air clears. Ash on the panels can be gently rinsed or cleaned as the manufacturer recommends, and you should not use harsh abrasives or pressure washers. If a fire has been near the house, have the system checked before you restart it.
What the weather is likely to cost you
| Event | Typical effect | What helps |
|---|---|---|
| Ordinary hail | Often none | Certified tempered glass |
| Very large hail | Cracked glass, claim | Insurance, inspection |
| High wind | Uplift on poorly fastened arrays | Engineered racking, inspection |
| Heavy snow | Output loss, structural load | Roof check, correct tilt |
| Nearby lightning | Possible inverter damage | Grounding, surge protection |
| Smoke | Short-term output loss | Wait; clean ash gently |
Insurance and warranties
Your insurer needs to know about the panels. Most home insurance covers fixtures attached to the house, but terms differ on deductibles, extra premiums and exclusions for certain perils. Ask your insurer in writing whether hail, wind, fire and theft are covered and whether the system should be listed separately. Keep your invoice, the specifications and the commissioning record together.
Warranties are separate from insurance. A product warranty usually covers manufacturing defects and gradual loss in output. It typically does not cover storm damage. Our explainer on panel warranties shows what is usually in and out. Be cautious about anyone offering to waive these points. If any wording is unclear, ask for it to be clarified in writing before you sign.
Before and after a storm
Before the season, look at the maintenance checklist and check that mounts and wiring look secure. After a severe storm, inspect from the ground with binoculars if it is safe. Look for cracked glass, loose racking, bent rails and displaced wiring. If anything looks wrong, switch the system off at the disconnect if you can do so safely, and call a qualified installer. Do not go onto the roof in poor conditions.
For more on seasonal conditions, see the cold climate hub. The takeaway is plain. Certified panels, sound mounting and the right insurance make weather a manageable risk, and your job is to check those three things before signing.
Quick answers
Will hail destroy my solar panels?
Usually not. Panels are tested against hail of a standard size, and many shrug off ordinary storms. Very large hailstones can crack glass, so check your insurance.
Are solar panels safe in lightning storms?
Panels do not attract lightning, but nearby strikes can send surges into wiring. Proper grounding, surge protection and following the electrical code reduce the risk.
Does wildfire smoke affect solar panels?
Heavy smoke reduces sunlight and therefore output while it lasts. Ash left on the glass can be cleaned later according to the manufacturer's guidance.
Where to verify
Rules and prices change. Confirm current details with the official bodies below.