Solar panels work hard year-round converting sunlight into clean energy for your home. In Calgary, where weather conditions can shift from dust to snow within a week, homeowners often ask whether regular cleaning is necessary to keep their solar systems performing efficiently. The truth is, for most Alberta homes, solar panels require very little maintenance, and in many cases, cleaning them too often can do more harm than good.
Do Solar Panels Need to Be Cleaned?
In most situations, no. Research from the University of California, San Diego found that dust and dirt buildup accounted for less than 0.05% energy loss per day, a negligible amount for most residential systems. For Calgary homeowners, the occasional rainfall is usually enough to rinse away light dust and pollen.
That said, cleaning may be worthwhile if your panels are located near construction sites, gravel roads, or agricultural areas where dust accumulates heavily, or if an extended dry spell leaves visible buildup. Otherwise, washing panels mainly serves aesthetic purposes rather than boosting efficiency.
Why You Should Be Careful Cleaning Solar Panels
Solar panels are sensitive electronic devices, and excessive pressure or the wrong cleaning method can cause permanent damage. Never use a pressure washer, harsh chemicals, or abrasive scrubbers. Doing so may scratch the glass surface or even void your warranty.
Before attempting to clean, always check your solar panel manufacturer’s care instructions or contact your installer. Many manufacturers include a maintenance guide that outlines safe methods for occasional cleaning and warranty requirements.
How to Safely Clean Solar Panels
- Check manufacturer guidelines: Review your warranty or specifications sheet to ensure cleaning won’t void your coverage.
- Rinse with a low-pressure hose: Use a gentle garden hose to wash off dust and debris. Avoid direct, high-pressure water jets.
- Use mild soap if needed: For stubborn dirt, mix a small amount of mild, non-abrasive soap with water. Wipe gently with a soft cloth or sponge.
- Clean early or late in the day: Avoid washing during hot midday hours. Sudden temperature changes can cause glass to crack due to thermal shock.
Treat your panels the same way you would wash your vehicle: gentle contact, no harsh scrubbing, and avoid anything that could scratch the surface.
How to Deal with Snow on Solar Panels
In Calgary’s winter months, snow buildup is common but rarely a major concern. Solar panels generate a small amount of heat during operation and are mounted at an angle, so snow usually slides off naturally after a few hours of sunlight. Light snow cover has a minimal impact on production.
If heavy snow or ice remains for several days, you can gently remove it using a soft brush or a snow broom designed for solar panels. Avoid metal tools or brushes with stiff bristles, as they can scratch the glass. Never use hot water — the rapid temperature change can cause cracking.
When to Consider Professional Cleaning
If you notice a significant drop in energy output on your monitoring system that isn’t weather-related, it may be time for a professional inspection. Certified solar technicians have the proper tools and safety equipment to clean and assess your system without risk of damage.
Keeping Your Solar Investment Efficient
For most homeowners, natural weather conditions rain in summer, snowmelt in winter — are enough to keep solar panels performing well. Occasional visual checks and gentle cleaning only when necessary are the best ways to maintain efficiency without risking damage.
Panel Upgrade Experts provides professional solar panel installation in Calgary and can also inspect or service your system if performance issues arise. Contact us today to schedule your next maintenance or to learn how solar can lower your power bills all year long.
