Why Do You Need to Clean Solar Panels and How to Do It?

Harnessing the power of the sun through solar panels has become a popular and sustainable energy solution worldwide. Solar panels, with their photovoltaic cells, absorb sunlight and convert it into electricity. This renewable energy source not only saves on utility bills but also contributes to a greener planet.

However, like any other equipment, solar panels need maintenance for optimal performance. Regular cleaning is a crucial part of this maintenance, as dust, debris, and bird droppings can accumulate over time, reducing the panels’ efficiency and, ultimately, the amount of electricity generated.

As a solar panel owner or prospective buyer, understanding the importance of regular cleaning and the correct cleaning techniques can help you reap the maximum benefits from your solar installation. We’ll explore why solar panels need cleaning, how often they should be cleaned, and how to do it right, ensuring your solar investment yields optimal returns.

Why Do You Need to Clean Solar Panels?

Effect of Dirt and Debris on Solar Panel Performance

Solar panels work by allowing light into the solar cells. The more light that hits a panel, the more power it will generate. Dirt and debris, such as leaves or bird droppings, can block the sunlight, thus reducing the panel’s efficiency and power output.

Why Do You Need to Clean Solar Panels and How to Do It

Impact on the Longevity of Solar Panels

Solar panels are designed to last for many years, often up to 25 to 30 years. Regular cleaning not only ensures optimal performance but also contributes to the longevity of the panels. Accumulated dirt and debris can cause hot spots on the panels, leading to faster degradation and shortening their lifespan.

Ensuring Warranty Validity

Many solar panel manufacturers include a provision in their warranty terms that requires regular cleaning and maintenance. Failing to comply with these terms could void the warranty, leaving you unprotected against potential damages or malfunctions.

Maximizing Your Investment in Solar Energy

To ensure the return on your solar investment, your solar panels need to operate at their maximum efficiency. Regular cleaning helps to maintain the panels’ performance, leading to higher energy production and lower electricity bills.

Factors Influencing the Need for Solar Panel Cleaning

Local Climate and Weather Conditions

The frequency of cleaning depends largely on your local climate and weather conditions. In areas with high pollution or frequent dust storms, solar panels may require more frequent cleaning.

Angle and Positioning of Panels

Solar panels installed at a steep angle are less likely to accumulate dust and debris than those installed at a lower angle. Similarly, panels installed in areas with high wind exposure might stay cleaner than those in more sheltered locations.

Surrounding Environment

If your solar panels are close to trees or birds, they might accumulate more bird droppings or leaves, requiring more frequent cleaning. Similarly, if your panels are located in an industrial area, they might collect more dust or soot, affecting their performance.

Signs That Your Solar Panels Need Cleaning

Decreased Energy Output

One of the most noticeable signs that your solar panels need cleaning is a decrease in energy output. Monitoring your solar system’s performance regularly can help identify any efficiency drops that might be due to dirty panels.

Visual Inspection

Another way to check if your solar panels need cleaning is through visual inspection. If you can see visible layers of dust or any bird droppings, it’s time to clean your solar panels.

Regular Maintenance Check-ups

Scheduled maintenance check-ups can help identify when your solar panels need cleaning. A professional can measure the output of your solar panels and recommend cleaning if necessary.

Why Do You Need to Clean Solar Panels and How to Do It

How to Clean Solar Panels

Safety Measures to Take Before Cleaning

Solar panel cleaning involves climbing onto the roof, which can be risky. Always prioritize safety – use a harness, non-slip shoes, and safety goggles. If you’re not comfortable working at heights, consider hiring a professional.

Tools Required for Solar Panel Cleaning

You will need a soft brush, a squeegee with a plastic blade, and a hose with a suitable nozzle. Alternatively, you can use a solar panel cleaning kit available in the market.

Step-by-Step Guide to Cleaning Solar Panels

  1. Wet the solar panels with water to soften any accumulated dirt or debris.
  2. Using the brush, gently scrub the surface of the panels.
  3. Rinse the panels with clean water using the hose.
  4. Use the squeegee to remove any excess water.
  5. Inspect the panels to ensure they are clean.

The Best Time to Clean Solar Panels

The best time to clean solar panels is early in the morning or late in the evening when the panels are not hot. Cleaning hot solar panels with cold water can cause them to crack.

The Pros and Cons of DIY Solar Panel Cleaning

Benefits of Doing It Yourself

Cleaning solar panels yourself can save you the cost of hiring a professional. It also gives you an opportunity to inspect the panels and your solar system closely.

Drawbacks and Potential Risks

However, cleaning solar panels can be risky due to the height and potential electrical hazards. If done incorrectly, it can also lead to scratches on the panels, affecting their performance.

When to Hire a Professional Solar Panel Cleaner

Criteria for Choosing a Professional Cleaning Service

If you choose to hire a professional cleaner, ensure they have relevant experience, positive customer reviews, and a thorough understanding of solar panel cleaning.

Average Cost of Professional Solar Panel Cleaning

The cost of professional solar panel cleaning varies depending on the size and location of your solar system, but it can range from $100 to $300 per clean.

Frequently Asked Questions

How often should solar panels be cleaned?

The frequency of cleaning depends on several factors including your local climate, the angle and positioning of the panels, and the surrounding environment. However, as a general rule of thumb, an annual or biannual clean is recommended.

Can I use detergent to clean solar panels?

It’s best to avoid using detergents as they can leave a residue on the panels that may affect their performance. Pure water is usually sufficient.

Can dirty solar panels cause damage to the system?

Yes, excessively dirty solar panels can cause hot spots, leading to premature degradation of the panels and possibly damaging the entire system.


Maintaining the cleanliness of your solar panels is crucial for ensuring their optimal performance, longevity, and the return on your investment. While dirt and debris might seem minor, they can significantly impact the efficiency of your panels, leading to decreased energy output and potential damage over time.

Knowing when and how to clean your solar panels is an essential part of solar panel ownership. Whether you choose to do it yourself or hire a professional, regular cleaning should be part of your solar panel maintenance routine.

Remember, safety is paramount when it comes to cleaning solar panels due to the associated risks of working at height and potential electrical hazards. Always use appropriate safety equipment, or hire a professional if you’re not comfortable doing it yourself.

I'm Louise, the Editor-in-Chief at AskingCenter.com. With a keen eye for detail and an unwavering passion for home enhancement, I curate and oversee content that strikes the perfect balance between creativity and practicality. Home improvement is more than just a task for me—it's about breathing new life into spaces. Together, let's make your home improvement dreams a reality.

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