Why Do Solar Panels Need To Be Cleaned? Question Answered!

solar panel cleaning

How often do you think about the state of cleanliness of your solar panels? Probably not that often, right? Well, as surprising as it might sound, maintaining the cleanliness of your solar panels is pivotal to their efficiency and longevity. Now, why would that be? What possible harm could a little dust or debris do to these robust technological marvels? Well, let’s embark on this illuminating journey together and find out.

Understanding Solar Panels

Before we dive into the necessity of cleaning solar panels, it would be helpful to grasp what solar panels are and how they function, right? Solar panels, or photovoltaic (PV) panels, are devices that convert sunlight into electricity. They’re made up of solar cells, each of which is usually a two-layer semiconductor sandwiched together. When sunlight hits these cells, it excites the electrons, and voilà, we have electricity.

What Happens When Solar Panels Get Dirty?

You might be wondering, how can dirt and debris affect these technical wonders? Well, it’s not as trivial as it sounds. When dust, dirt, or any other debris settles on the surface of your solar panels, they form a layer which obstructs the sunlight from reaching the solar cells. This phenomenon, also known as soiling, reduces the efficiency of your solar panels, thereby cutting down on the energy they generate.

How Much Energy Do Dirty Solar Panels Lose?

Dirty solar panels are quite the energy vampires. According to research, a dirty solar panel can lose 15-25% of its energy output, and the number can soar as high as 50% in some cases. Imagine throwing away half of the energy potential just because of a bit of dirt!

The Role Of Weather

“But it rains regularly in my area; won’t that clean the solar panels?” Fair question. While rain can wash away some dirt, it leaves behind a layer of grime that can actually accumulate and harden over time. Moreover, rainwater often carries airborne particles that can stick to the panels, leading to even more accumulation.

Solar Panel Cleaning: More Than Just Aesthetics

Now you know that cleaning solar panels isn’t just about keeping them shiny. It’s a necessary maintenance activity that plays a huge role in optimizing the power output and increasing the lifespan of your panels.

How Often Should You Clean Solar Panels?

That’s a bit tricky as it depends on several factors like your geographical location, local weather conditions, and the tilt angle of your panels. However, experts suggest checking your panels at least every six months and performing a thorough cleaning once a year.

DIY Or Professional Cleaning: What’s The Best?

Are you the DIY type, or do you prefer hiring professionals for such tasks? The good news is that cleaning solar panels is relatively simple and can be done using water and a soft brush. However, if your panels are hard to reach or you’re not comfortable doing it, professional cleaning services are a good option.

The Bottom Line

In conclusion, keeping your solar panels clean is not just an aesthetic choice but an imperative one for maximizing their efficiency and lifespan. Whether you go DIY or hire a professional, ensure to keep those panels clean and soaking up as much sunlight as possible!

Frequently Asked Questions

  1. Why do solar panels need cleaning?

    Solar panels need cleaning to maintain their efficiency. Dust, debris, and other particles can obstruct sunlight, reducing the panel’s energy output.

  2. How much energy do dirty solar panels lose?

    Dirty solar panels can lose between 15-25% of their energy output, and in extreme cases, this number can go as high as 50%.

  3. Does rain clean solar panels?

    Rain can wash off some dirt but it usually leaves behind a residue of dust and other particles, which can accumulate over time and decrease the panel’s efficiency.

  4. How often should I clean my solar panels?

    This depends on your location and the local weather conditions, but as a general rule of thumb, you should check your panels every six months and do a thorough cleaning once a year.

  5. Can I clean solar panels myself?

    Yes, cleaning solar panels is a simple process that can be done using water and a soft brush. However, if your panels are high up or difficult to reach, it might be safer to hire a professional service.


  1. Razykov, T. M., Ferekides, C. S., Morel, D., Stefanakos, E., Ullal, H. S., & Upadhyaya, H. M. (2011). Solar photovoltaic electricity: Current status and future prospects. Sol. Energy, 85(8), 1580-1608. Link
  2. Kim, K. H., Kabir, E., & Kumar, V. (2018). Solar energy: Potential and future prospects. Renewable and Sustainable Energy Reviews, 82, 894-900. Link
  3. Appels, R., Baeyens, J., Degrève, J., & Dewil, R. (2018). Principles and potential of the anaerobic digestion of waste-activated sludge. Progress in energy and combustion science, 32(2), 113-139. Link
  4. Pagnossin, G., Manca, D., Moser, D., & Sparber, W. (2014). Soiling losses of photovoltaic modules: a comprehensive review. Journal of Cleaner Production, 84, 357-369. Link


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