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During the winter months, many solar panel owners have to deal with snow on their roofs. This often raises questions: Will my system still work? Will I lose a lot of energy output? And do I have to remove the snow myself?
How does snow affect the output of solar panels?
When solar panels are completely covered with snow, sunlight is temporarily blocked, and energy production drops sharply or even stops entirely. That sounds concerning, but in reality, the impact on an annual basis is usually very limited. In winter, solar radiation is lower anyway and the days are shorter, so solar panels generate a smaller share of their annual output during this period.
Furthermore, solar panels are almost always installed at an angle. As a result, snow rarely stays on them for long. As soon as the sun comes out or the temperature rises slightly, the snow slides off or melts on its own. The loss of output is therefore usually limited to a few days a year and has virtually no impact on the system’s overall efficiency.
Do you still want to clear the snow?
In exceptional situations, it may be advisable to remove snow, for example, when a thick layer of snow remains on the ground for an extended period or when the solar panels are installed at an almost horizontal angle. In professional installations where continuity is crucial—such as at companies with high winter energy consumption—it may also be necessary to take action sooner.
Even then, caution remains essential. When removing snow, it is best to do so from the ground using a long-handled tool with a soft brush or rubber scraper, without applying pressure to the panel.
What should you avoid using?
- Stiff bristles
- Ice Scrapers
- Hot water
- Road salt
- Antifreeze agents
Conclusion: Snow on solar panels is rarely a cause for concern
Although snow can temporarily reduce the output of solar panels, the effect on an annual basis is usually negligible. The risks of removing snow yourself often do not outweigh the limited benefit that can be gained from doing so. A well-designed system with the proper tilt angle ensures that snow slides off on its own as soon as conditions improve.
