Cleaning Solar Panels – A Guide For Homeowners

Last Updated on October 3, 2023

Solar panels are a growing source of renewable energy, providing a reliable and sustainable alternative to traditional sources of power. Not knowing the importance of cleaning solar panels and the use of incorrect cleaning methods can lead to reduced output and potential damage to the panels.

Therefore, understanding the factors affecting the cleaning of solar panels, the effects of environmental factors, and the appropriate cleaning methods is essential to maintaining optimal performance.

Various factors can affect the cleanliness and efficiency of solar panels, including environmental factors, geographic location, installation factors, and types of pollutants. The accumulation of dirt, dust, and other pollutants on the panels’ surfaces can reduce the amount of sunlight that reaches the solar cells, leading to a decrease in energy output. Therefore, it is crucial to understand the factors that contribute to the accumulation of debris on solar panels and the most effective methods for cleaning them.

This article will explore the importance of cleaning solar panels and the various methods and costs associated with professional cleaning.

Key Takeaways

  • Dirty solar panels can reduce output, so regular cleaning is important for maximum efficiency.
  • Pollen, bird droppings, leaves, ash, and smog can form a layer of surface soiling on solar panels, which can be rinsed away with rain or removed with gentle cleaning methods.
  • The recommended cleaning process for solar panels is to rinse with clean water, gently wash with soapy water and a soft scrubber, rinse again, and squeegee.
  • Professional cleaning may be necessary due to roof height, steepness, or lack of equipment, and can be cheaper, safer, and easier when done by professionals who use proper equipment and know how to work on roofs safely.

Factors Affecting Cleaning Panels

The efficiency and output of solar panels can be affected by various factors that impact their cleaning requirements. One of the most significant factors is environmental conditions. For instance, solar panels located in regions with high dust levels require more frequent cleaning as dust accumulation can hinder the panels’ performance. Similarly, areas with high levels of bird droppings or tree sap may require more frequent cleaning to prevent surface soiling.

Other environmental factors such as humidity, rainfall, and temperature can also affect the cleaning needs of solar panels.

Apart from environmental factors, the type of pollutants present in the area can also impact the cleaning requirements of home solar panels. Pollutants such as smog, ash, and pollen can form a layer of soiling on the panels, reducing their efficiency. Moreover, some pollutants may require specialized cleaning techniques or materials to remove, which can increase the cost of cleaning.

Therefore, understanding the environmental conditions and types of pollutants present in the area is crucial in determining the cleaning frequency and methods for solar panels.

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Methods for Cleaning Home Solar Panels

Various techniques have been recommended for cleaning photovoltaic (PV) modules, including rinsing with clean water, gently washing with soapy water and soft scrubber, and squeegeeing. It is important to note that the use of harsh cleaning materials or sharp instruments may void warranties, and tap water and soap should be avoided to prevent mineral buildup. It is also recommended to clean the panels at dawn, dusk, or on overcast days to avoid water evaporation.

For heavier buildup, DIY options such as soft scrubbers and mild soapy water can be used, but it is essential to avoid common mistakes that can damage the panels. The use of abrasive materials, such as steel wool or sandpaper, should be avoided, as well as the application of too much pressure or force when cleaning. It is also important to avoid cleaning the panels when they are hot, as this can cause thermal stress and damage to the cells.

For best results, the recommended cleaning process is to rinse with clean water, gently wash with soapy water and soft scrubber, rinse again, and squeegee. In cases where roof height, steepness, or lack of equipment makes it difficult to clean the panels, it may be necessary to hire professional cleaners.

Professional Cleaning

Professional cleaners may be necessary for individuals who have difficulty reaching their solar panels due to roof height, steepness, or lack of equipment.

While cleaning panels can be done by yourself, hiring a professional cleaner can ensure that the job is done efficiently and safely.

Professional cleaners have the necessary equipment to reach the panels, and they also have the expertise to know how to clean the panels without causing any damage.

One concern that many individuals have when considering professional cleaning is the cost effectiveness.

While it may seem like an unnecessary expense, it is important to consider the potential loss of efficiency and output that can result from dirty solar panels.

In addition, professional cleaners often charge a reasonable fee, with the national average cost ranging from $130-$150.

Hiring a professional cleaner can ultimately save time, money, and ensure that the solar panels are cleaned properly and safely.

Safety measures should also be taken into account when cleaning, as working on roofs can be dangerous.

It is important to ensure that the professional cleaner has insurance and follows proper safety protocols to prevent any accidents or injuries.

Cleaning Solar Panels – Wrap Up

The efficiency of solar panels can be affected by a number of factors, including environmental conditions and the types of pollutants present in the area. Regular cleaning is necessary to keep the panels in good condition and maintain their output.

There are several methods for cleaning home solar panels, including the use of specialized cleaning products and equipment. Professional cleaning services are also available for those who do not wish to clean their panels themselves.

The importance of cleaning your solar panels cannot be overstated. A dirty solar panel can lead to reduced output and decreased efficiency, which can ultimately result in higher energy costs. It is important to understand the factors that affect the cleanliness of solar panels and to use the proper cleaning methods to avoid damage.

By taking the time to maintain their solar panels, homeowners can ensure that they are getting the most out of their investment in renewable energy. Professional cleaning services can also be a valuable resource for those who want to ensure that their panels are cleaned properly and efficiently.

Cleaning Solar Panels – Frequently Asked Questions

How often should solar panels be cleaned?

The frequency of cleaning depends on environmental factors, types of pollutants, and geographic location, but they should be cleaned at least twice a year. Regular cleaning benefits maximum efficiency, with recommended methods including soft scrubbers and squeegees. Professional cleaning may be necessary for safety and equipment reasons.

Can cleaning be done by a homeowner or is it always necessary to hire a professional?

Cleaning can be done by a homeowner, but hiring a professional may be necessary for hard-to-reach panels or steep roofs. DIY methods include gentle washing and squeegeeing, while professional cleaning can cost $130-$150 and offer cost-effective solutions.

What are some common mistakes to avoid when cleaning home solar panels?

Common mistakes include over cleaning and using abrasives. Proper equipment such as soft brushes and distilled water should be used. Technical and detail-oriented cleaning is necessary to avoid damage.

Are there any environmental concerns associated with cleaning home solar panels?

Environmental impact of cleaning your solar panels can include wastewater runoff and potentially harmful cleaning chemicals. Eco-friendly cleaning solutions, such as using plain water or vinegar, can reduce environmental impact and still effectively clean panels.

What impact does the angle of the solar panels have on the cleaning process?

The angle of solar panels does not significantly affect the effectiveness of DIY cleaning, but it can make professional cleaning more necessary due to safety concerns. Professional cleaning benefits include proper equipment and insurance.


  • John Miller

    John Miller is a seasoned professional in the field of solar energy, holding a Bachelor's degree in Electrical Engineering from UCSD and a Master's degree in Sustainable Energy Systems from the University of Michigan. With his expertise in solar panel design, system integration, and performance analysis, John specializes in developing and implementing customized solar power solutions for residential and commercial applications for some of the nation’s top solar providers.

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