Solar Panel Cleaning: How-To Guide

As the world faces the consequences of climate change due to our irresponsible activities, we are approaching an undesirable outcome in the not-so-distant future. However, as we transition from one era to another, technology evolves, and we are fortunate to have discovered renewable energy.

Renewable energy comes from various sources, but one that is currently dominant and available for consumers to purchase and utilize is solar energy. Solar energy is made possible thanks to the invention of solar panels, which we’ll explore further.

What Are Solar Panels?

Solar panels allow us to harness solar energy from the sun and convert it into electricity to power various loads. They consist of numerous solar cells made from semiconductor materials, typically silicon. When sunlight hits a solar panel, it creates an electric field, causing electricity to flow. This process is known as the photovoltaic effect.

Why Should You Clean Solar Panels?

To maximize the effectiveness and efficiency of solar panels, it’s essential to keep them clean. Depending on the location, various factors can interfere with the absorption of sunlight, thus reducing the efficiency of your solar panels. For example, leaves from nearby trees may drop onto the panels, reducing the surface area available to absorb sunlight.

In some cases, a layer of soot or dirt can cover your solar panels, preventing the photovoltaic cells from absorbing the sun’s rays. According to studies conducted by the National Renewable Energy Laboratory, the efficiency of solar panels can decrease by up to 7% if they are not properly maintained. Regular cleaning also helps to prolong the lifespan of your solar panels.

How Often Should You Clean?

The frequency of cleaning depends on several factors, including location, local environment, and the amount of dust, dirt, or debris that accumulates on the panels. Here are some guidelines:

1. Geographic Location & Climate

• Dusty Areas: If you live near factories or roads, you might need to clean your panels every 2-4 months.
• Urban Areas: In cities or areas with more pollution, cleaning every 6 months to a year may be sufficient.
• Rainy Climates: Regular rainfall might help clean your panels naturally, so manual cleaning might only be needed once a year.

2. Visible Dirt and Debris

If you notice visible dirt, bird droppings, leaves, or other debris on your panels, it’s a sign that they need to be cleaned as soon as possible. Even a small amount of shading can significantly reduce the efficiency of your solar panels.

3. Seasonal Changes

After the winter season, especially in areas with snow, it’s a good idea to clean your panels to remove any accumulated grime. Similarly, after the fall, clearing off any leaves or organic material is beneficial.

4. Performance Monitoring

Always monitor your solar panel’s performance. If you notice a drop in energy production efficiency, it could be due to dirty panels. If so, it’s time for some cleaning.

5. Professional Cleaning

If you’re unsure or uncomfortable with cleaning the solar panels yourself, professional cleaning services are available to cater to your needs. Professionals can assess your situation and provide the best possible solution and suitable cleaning schedule.

What Do You Need?

To clean solar panels effectively, you’ll need a few basic tools and materials:

1. Soft Brush or Sponge: For gently scrubbing the panels to remove dirt, dust, and debris. Use a non-abrasive, soft-bristled brush, or a sponge. Avoid anything that could scratch the surface of the panels. Alternatively you could try using our window washer as it works well too!
2. Water: For rinsing off dirt and cleaning solution. Clean, distilled water is best, especially if you have hard water with high mineral content, as it prevents mineral deposits. Otherwise, regular tap water works fine.
3. Mild Soap or Detergent: To remove stubborn dirt, bird droppings, or grease. Use a mild, non-abrasive soap or detergent. Avoid using strong chemicals, bleach, or ammonia-based products, as these can damage the panels.
4. Garden Hose: For rinsing the panels after scrubbing. A garden hose with a nozzle that provides a gentle spray is ideal. Avoid using high-pressure water jets, as they can damage the panels.
5. Squeegee: For removing excess water and preventing streaks. A squeegee with a soft rubber blade is best, helping to quickly remove water, especially in cooler or humid conditions where drying may take longer.
6. Extension Pole: To reach high or difficult-to-access panels. An extension pole that can attach to your soft brush, sponge, or squeegee allows you to clean panels without needing to climb onto the roof.
7. Buckets: For mixing soap and water. Any standard bucket will work. Make sure to use clean water, and refresh the water if it gets too dirty during the cleaning process.
8. Microfiber Cloth (Optional): For drying or polishing the panels after cleaning. A soft microfiber cloth can be used for a final wipe-down if needed, though air drying usually works well.
9. Safety Gear: To ensure safety while cleaning, especially if panels are on the roof. Non-slip shoes, gloves, and a safety harness if working at heights are recommended.

How to Clean?

Cleaning solar panels is a straightforward process, but it’s important to be careful to avoid damaging them. Here’s a detailed guide:

1. Safety First:

• Turn Off the System: Before cleaning, make sure to turn off the solar panel system to avoid any electrical hazards.
• Check Manufacturer Guidelines: Some solar panels may have specific cleaning recommendations or warnings.
• Work Safely: If your panels are on the roof, ensure you have proper safety gear, such as a harness and non-slip shoes.

2. When to Clean:

• Early Morning or Late Evening: Clean your panels early in the morning or late in the evening when they are cool.

3. Cleaning Process:

• Rinse First: Start by rinsing the panels with clean water to remove loose dirt and debris, preventing scratches during scrubbing.
• Gently Scrub: Use a soft brush or cloth to gently scrub the surface of the panels, removing stubborn dirt or bird droppings.
• Rinse Again: After scrubbing, rinse the panels thoroughly with water to ensure no soap or residue is left behind.
• Drying (Optional): Let the panels air dry, or use a soft squeegee to remove excess water if preferred.

4. What Not to Do:

• No Harsh Chemicals: Do not use abrasive cleaners, bleach, or ammonia-based products, as they can damage the panels’ coating.
• No High-Pressure Water: Avoid using a pressure washer, as the high pressure can damage the panels.
• Don’t Stand on Panels: Never stand or put heavy objects on the panels, as they can crack under pressure.

Maintaining clean solar panels is not just about optimizing energy production; it’s about making a commitment to the longevity of your investment and the environment. By keeping your panels free from dirt, debris, and other obstructions, you ensure that they can perform at their peak efficiency, providing you with clean energy for years to come. Regular cleaning is a simple but crucial step in safeguarding the performance of your solar panels, contributing to a more sustainable future.

Embrace this responsibility, whether through DIY cleaning or professional services, and let your solar panels shine as brightly as the energy they generate. Remember, the cleaner your panels, the greater your impact on reducing carbon footprints and fostering a greener planet. Keep them pristine, and they’ll keep powering your world with the sun’s abundant energy.