When (and When Not) to Remove Snow from Commercial Solar Arrays

Winter brings unique challenges to commercial solar sites, and snow accumulation is one of the most common. While snow can temporarily reduce energy production, removing it isn’t always straightforward—and doing so improperly can create safety hazards or even damage the system.

Understanding when to clear snow and when to leave it alone is critical for both performance and safety.

How Snow Impacts System Performance and Safety

Snow can affect performance in several ways:

• Reduced Production: Snow covering panels blocks sunlight, lowering production. Even partial coverage can reduce system efficiency.

• Uneven snow melt: Snow on sloped modules often melts unevenly, creating “hot spots” if portions of the panel remain shaded.

• Structural load: Heavy, wet snow can put stress on the structural integrity of the racking, roof, etc.

  
  

Despite these effects, snow doesn’t always require removal. Understanding the trade-offs is key.

When Snow Removal Makes Sense

Photo by Day Electric

1. Extended Coverage Impacts Production

If snow remains on panels for several days during peak sunlight periods, energy losses can become significant, especially for revenue-generating commercial systems.

2. Heavy Snow Creates Structural Concerns

Wet, heavy snow or ice accumulation may exceed the array’s design load. Check manufacturer specifications before considering removal.

3. Access or Safety Concerns

Snow obstructing emergency access paths, roof walkways, or equipment panels may need clearing to ensure safety and compliance. Also consider the impact of snow and ice sliding off arrays naturally, and where it will fall.

4. Monitoring and Sensor Function

Snow covering sensors or weather stations used for system monitoring may require clearing to maintain accurate data.

When Not to Remove Snow

1.Light, Fluffy Snow

Most light snow will slide off tilted panels naturally. For trackers, set to “snow mode” for faster removal. Forcing removal can damage module surfaces or frames.

2. Risky Roof Conditions

Don’t attempt manual snow removal on steep or icy rooftops, especially if the individual is not properly trained for this scope. Slip-and-fall risks far outweigh temporary production gains.

3. Risk of Equipment Damage

Using metal tools, shovels, or scraping devices can scratch panels, damage junction boxes, or compromise seals.

4. Short-Lived Snow

If sunny or mild conditions are forecasted, snow may melt naturally within hours. Waiting avoids unnecessary risk.

Safe Snow Removal Practices

When snow removal is necessary, follow these safety and equipment best practices:

• Use non-metal tools: Plastic roof rakes or brushes designed for solar panels reduce the risk of damage.

• Work from safe positions: Ground-mount arrays allow snow clearing from the ground; roof-mounted systems should only be accessed with proper fall protection and training. Be aware of falling snow and ice.

• Avoid concentrated pressure: Clear snow in thin layers rather than heavy scraping.

• Consider professional services: For large commercial systems, professional snow removal crews ensure both safety and system protection. Sometimes it is best to call in professionals,

Not all snow needs to be removed from commercial solar arrays. In many cases, nature does the work for you, and attempting to clear it can introduce unnecessary risks. Snow should only be removed when it threatens production, safety, or structural integrity—and always with proper tools, procedures, and training.