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Do You Need to Clean Solar Panels?

solar panel cleaning

Solar panels are hailed as an eco-friendly and cost-effective solution for harnessing the power of the sun to generate electricity. However, having your solar panels cleaned is crucial for maintaining optimal efficiency

Recent university research has highlighted that a dirty solar panel can experience a significant loss of up to 50% in efficiency compared to its clean counterpart. The accumulation of dust, dirt, and debris on the surface obstructs sunlight absorption, hindering the panel’s ability to convert sunlight into electricity effectively. 

In this blog post, we will uncover the reasons why keeping your solar panels clean is essential and explore the various benefits it brings.


  • Why Clean Solar Panels?
  • How Often Do Solar Panels Need to be Cleaned? 
  • Is it Really Necessary to Clean Solar Panels?
  • What Happens if You Don’t Clean Your Solar Panels?
  • Can You Clean Your Own Solar Panels?
  • Is it OK to Hose off Solar Panels?
  • Does Rain Clean Solar Panels?

Why Clean Solar Panels? 

Maintaining the cleanliness and efficiency of your solar panels offers various benefits that can translate into long-term cost savings. Regular cleaning ensures optimal sunlight absorption, leading to increased energy production and improved overall performance. By preventing efficiency losses caused by dirt and debris accumulation, you not only enhance the lifespan of your solar panels but also reduce the need for additional energy sources, potentially lowering your electricity bills. 

A well-maintained solar energy system is likely to require fewer repairs and replacements, contributing to substantial financial savings over time. Investing in the cleanliness and efficient upkeep of your solar panels is a smart strategy that pays off both in environmental sustainability and economic terms.

1. Improved Efficiency 

Clean solar panels play a vital role in enhancing energy efficiency, as airborne particles in the atmosphere directly affect the performance of a photovoltaic plant. Studies and reports reveal that pollution from particles in the air can lead to a reduction in solar panel efficiency by as much as 25%. 

When dirt and debris settle on the surface of solar panels, they act as barriers, preventing sunlight from fully reaching the photovoltaic cells. This obstruction inhibits the panels’ ability to absorb sunlight and convert it into electricity, underscoring the importance of regular cleaning to maximise energy production and overall efficiency in solar energy systems.

2. Reduced Fire Risk 

Ensuring the cleanliness of solar panels is a critical aspect of reducing fire risk in photovoltaic (PV) systems. Routine and preventative maintenance are essential for all PV systems, including the management of vegetation and, notably, the regular cleaning of solar panels. Accumulation of dirt, algae, moss, or lichen on the panels can pose a significant fire hazard. 

By keeping the panels clean and free from such debris, the risk of fire caused by the PV system is significantly mitigated. This proactive approach not only contributes to maintaining the longevity of the solar panels but also safeguards against potential fire incidents, emphasising the importance of incorporating regular cleaning into the overall maintenance strategy for a safe and efficient solar energy system.

3. Enhanced Durability

Keeping solar panels clean is crucial in enhancing their durability. Clean solar panels are less susceptible to corrosion, discolouration, or degradation, ensuring their longevity and overall structural integrity. Accumulated dirt and grime can compromise the surface of the panels over time, leading to potential damage that could affect their performance and lifespan. 

Regular cleaning not only safeguards against corrosion and deterioration but also maintains the efficiency of the panels, contributing to an extended and robust service life. 

4. Aesthetic Appeal

Clean solar panels extend beyond functionality, they can also significantly enhance the visual appeal of your property. Beyond their environmental benefits, well-maintained solar panels contribute to the overall aesthetic of your home, adding a sleek and modern touch. 

A pristine solar panel not only reflects a commitment to sustainable energy but also showcases a meticulous approach to home maintenance. The clean surface of solar panels adds to the curb appeal of your property, increasing its market value by up to 14%. Increasingly valuing eco-friendly features, and having a visually appealing solar energy system can be a unique selling point, attracting environmentally conscious buyers and adding an extra dimension of value to your home.

5. Improve ROI Time

Regularly cleaning your solar panels goes beyond ensuring optimal performance, it’s a strategic move to expedite your return on investment. Clean panels operate efficiently, maximising energy production and, consequently, shortening the typical payback period of 3 to 5 years for solar energy systems. 

Consistently maintaining your solar panel system is a smart move that pays off sooner. By cutting down the time needed to recover your initial investment, ongoing maintenance supports both environmental sustainability and the financial success of your solar energy system.

6. Environmental Impact

Regularly cleaning solar panels improves environmental impact by maximising their efficiency and energy output. When solar panels are covered in dust, dirt, or other debris, they receive less sunlight, leading to reduced energy production. By keeping the panels clean, they can capture more sunlight and generate more electricity, increasing the overall contribution of clean, renewable energy to the power grid. 

This means less reliance on fossil fuels and a decreased carbon footprint, contributing to a more sustainable and environmentally friendly energy production process. Cleaner solar panels help ensure that renewable energy systems operate at their best, promoting the adoption of solar power as a reliable and efficient source of electricity.

How Often Do Solar Panels Need to be Cleaned? 

Solar panels need to be cleaned once a year. Since the panels tend to generate the most energy during spring and summer, cleaning at the beginning of spring is advisable. Winter weather conditions can deposit debris on the panels, impacting their efficiency. Therefore, a yearly cleaning routine helps ensure optimal performance by removing dust, dirt, and other accumulated materials, allowing the panels to capture maximum sunlight and maintain peak efficiency throughout the year.

So, is it Really Necessary to Clean Solar Panels?

In conclusion, yes, it is essential to clean your solar panels. The benefits, ranging from increased energy production to improved aesthetics and extended lifespan, far outweigh the effort involved. Regular maintenance not only ensures that you get the most out of your solar investment but also contributes to a sustainable and efficient energy future.

As you bask in the benefits of clean solar panels, remember that a small investment in maintenance can go a long way in maximising the returns from your solar energy system. So, the next time you glance at your solar system, consider the value that a clean surface brings to both your energy efficiency and the overall beauty of your property.

At Rejuv Exteriors, we specialise in solar panel cleaning in Hampshire, West Sussex and surrounding areas. Get in touch for a free assessment or quote today.

Frequently Asked Questions

What Happens if You Don’t Clean Your Solar Panels?

Neglecting to clean your solar panels can lead to decreased sunlight absorption due to the accumulation of dirt, hindering their efficiency. When dirt builds up on the panels, it acts as a barrier, preventing sunlight from being effectively captured. This obstruction diminishes the panels’ ability to convert sunlight into electricity, thereby reducing energy output.

Maintaining the cleanliness of the solar panels is crucial for their overall condition and longevity. Regular cleaning not only ensures optimal performance but also contributes to the extended lifespan of the panels, safeguarding your investment in solar energy.

Can You Clean Your Own Solar Panels?

While it might be tempting to clean your own solar panels, we do not recommend doing so. Cleaning solar panels requires specific knowledge and equipment to avoid causing damage. 

Using the wrong cleaning agents or abrasive materials can scratch the panels and diminish their efficiency. Working at heights, often necessary for rooftop solar panels, poses safety risks. It’s advisable to hire professionals such as ourselves with experience in solar panel maintenance to ensure a thorough and safe cleaning process, preserving the integrity and efficiency of your solar energy system.

Is it OK to Hose off Solar Panels?

While it’s technically possible to hose off your own solar panels, we do not recommend it as a preferred solar cleaning method. Hosing may not effectively remove stubborn dirt or bird droppings, and the use of hard water can lead to mineral deposits that hinder sunlight absorption. 

Spraying water on hot panels can risk thermal shock, potentially damaging the tempered glass. For optimal results, it’s advisable to consult with our team of cleaning technicians to ensure the longevity and maximum efficiency of your solar panels.

Does Rain Clean Solar Panels?

While rain can provide a basic rinse for solar panels, it is not particularly effective in thoroughly cleaning them. Rainwater may not remove accumulated dust, dirt, or bird droppings, which can hinder sunlight absorption and reduce the efficiency of the panels over time. 

For optimal performance, it’s recommended to supplement rainfall with regular, more thorough cleaning methods to ensure that your solar panels operate at their peak efficiency and continue to generate maximum energy output.

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