Weathering the Elements: How Solar Panels Hold Up in Rain, Hail, Snow, and More

One of the most common questions we hear is: "Do solar panels work in bad weather?" The good news is that modern solar panels are built to withstand a wide range of environmental conditions — from heavy rain to snow and even hailstorms. Let's break down what you can expect when the weather turns and how your solar investment will continue to perform reliably year after year.

1. Built to Last in the Elements

Solar panels are engineered with durability in mind. Most panels are framed in aluminum and covered with tempered glass — the same kind used in car windshields — designed to handle decades of exposure to wind, snow, rain, and sunlight. They're tested to international standards, including:

Wind resistance up to 2400 Pascals (equal to 130+ km/h winds)

• Snow load tolerance up to 5400 Pascals

• Hail resistance to withstand hailstones up to 1 inch in diameter traveling at 80 km/h

While extreme weather events may cause damage in rare cases, under typical Canadian conditions, solar panels are a safe, resilient technology.

2. Rain and Solar Panels

Rain doesn't harm solar panels — in fact, it helps. A light rain can clean off dust, pollen, and debris that may accumulate and reduce efficiency.

While heavy clouds and rain do reduce the amount of sunlight reaching your panels, solar systems still produce some energy even when it's overcast. You can expect production to dip by 10–25% on cloudy days, depending on cloud thickness.

3. Hail and Impact Resistance

One of the most common concerns in places like the Interior of BC is hail. Thankfully, panels undergo rigorous testing for impact. Most Tier 1 solar manufacturers test their panels against hailstones of 1 inch in diameter — and many will withstand larger stones, depending on angle and wind speed.

If your home insurance covers roof damage from hail, it often extends to solar as well. It's always good to check with your provider.

4. Snow and Cold Weather Performance

Solar panels actually perform better in cooler temperatures. While snow can temporarily block production, the dark glass surface of panels helps them absorb sunlight and shed snow quickly. Panels are usually installed at an angle, so snow slides off naturally.

Heavy snow accumulation may reduce output briefly, but there's generally no need to clear it manually unless it's prolonged or affecting off-grid performance. Be cautious if you do — never use a metal object or walk on panels.

5. Cleaning and Maintenance

Solar panels are largely self-cleaning thanks to rain, snowmelt, and gravity. However, in dry or dusty climates (or near construction zones), occasional manual cleaning may help maintain optimal performance.

Use a soft brush, warm water, and mild soap — or hire a professional cleaner. Avoid abrasive materials or pressure washers, which can damage the surface.

The Bottom Line

Solar panels are built for the real world. They're tough, weather-resistant, and designed to keep working in everything from drizzles to snowstorms. And while they might produce a little less energy during overcast days, they still keep generating clean electricity year-round.

If you're ready to take the next step toward solar — rain or shine — we're here to help.