Solar panels are an investment in renewable energy that benefits both your wallet and the environment. However, like any investment, they need upkeep to maintain their performance. Dust, debris, bird droppings, and environmental residues can layer over your panels, reducing sunlight absorption and, consequently, energy output. 

By regularly cleaning your panels, you can optimise energy generation, extend the lifespan of your system, and maximise cost savings. This guide provides a step-by-step approach to safely cleaning your solar panels at home.

Why You Should Clean Your Solar Panels Regularly

Enhanced Energy Production

Solar panels operate best when their surfaces are clean and unobstructed. Even a thin film of dust can block sunlight, limiting the efficiency of photovoltaic cells in converting light to electricity. Studies have shown that a dirty panel can lose anywhere from 15% to 25% of its efficiency. This means that by keeping them clean, you’re ensuring that they absorb the maximum possible sunlight, translating to more energy for your home.

Cost Savings and Return on Investment

A significant motivation for investing in solar energy is the long-term cost savings. Dirty panels result in reduced energy output, which can affect the financial returns on your investment. Regular cleaning ensures that your panels generate peak power, allowing you to reduce your reliance on the grid. In the long run, this can shorten the payback period for your solar system and increase the cumulative savings on your electricity bills.

Prolonged Lifespan

Solar panels are durable and designed to last for 25-30 years, but debris can cause degradation over time. Bird droppings and tree sap can be acidic, gradually corroding panel surfaces. Even tiny scratches from wind-blown sand or dirt can slowly wear down the protective layers. Regular cleaning mitigates these risks, preserving the panels’ surface integrity and ensuring a longer lifespan. 

Optimised Performance During Seasonal Changes

Dust and pollen accumulation can spike during certain seasons, such as spring, while monsoons bring mud and debris. These factors mean that, depending on your location, you may need to increase the frequency of your cleaning during these periods. Clean panels perform better in all weather conditions, helping you make the most of sunny and cloudy days alike.  

Signs That You Need to Clean Your Solar Panels

Being able to identify when your panels need cleaning is crucial. Here are some telltale signs to watch for:

• Visible Dust and Debris: Dust, dirt, and other particles are often visible, particularly after dry or windy conditions. Over time, this accumulation will be evident to the naked eye.

• Significant Drop in Energy Production: Solar systems typically come with monitoring software or apps that let you track their output. If you notice a steady decline in output without any technical issues, it may be due to dirty panels.

• Bird Droppings, Pollen, or Tree Sap: Unlike dust, bird droppings and tree sap can be more challenging to remove and may corrode the panel’s surface if left for long periods. Spring and early summer often bring pollen buildup, while birds are more active in other seasons.

• Environmental and Seasonal Factors: Seasonal dust storms, pollen, monsoons, or proximity to factories, farms, or highways can increase dust and grime accumulation. Regular inspection in these scenarios will help keep your panels clean.

What to Consider Before Solar Panel Cleaning

Safety First

Safety should be your top priority. If your panels are on a rooftop, ensure you have a stable ladder, and use proper safety gear, such as non-slip shoes, gloves, and a safety harness if necessary. Working in pairs is recommended if you’re cleaning on a sloped or high roof.

Weather Conditions

Clean on a cool, cloudy day or in the early morning or late evening when sunlight is not intense. Panels can get very hot under the sun, making them harder to clean and increasing the risk of burns or thermal stress on the panels. Cleaning in cooler conditions also prevents quick evaporation, which can leave streaks on the glass.

Water Quality and Cleaning Supplies

The water you use matters. Distilled water is ideal, as tap water can contain minerals that may leave a residue. Avoid using harsh chemicals or abrasive cleaners, as these can degrade the panel coating over time. Use only eco-friendly and biodegradable soaps, if needed.

Solar Panel Cleaning Equipment

A soft-bristled brush, a squeegee, and a microfiber cloth are essential for effective cleaning. Solar panel cleaning kits are widely available and designed to prevent scratches or damage. A long extension pole with a brush attachment can be useful for cleaning hard-to-reach areas, while a hose with a spray nozzle offers a gentle and thorough rinse. 

Step-by-Step Guide: How to Clean Solar Panels at Home

Turn Off Your Solar System

For safety reasons, before solar panel cleaning always turn off your solar system before beginning any cleaning. Check the manufacturer’s manual for instructions on properly shutting down your system. This reduces the risk of electrical shocks and protects your system from damage.

Inspect the Panels

Walk around and examine your solar panels. This helps you assess any damage, stubborn stains, or areas with excessive dirt buildup. Noting these spots beforehand will make it easier to focus on areas that need the most attention.

Rinse with Water

Begin by rinsing the panels with a low-pressure hose. High-pressure streams can damage solar panels by creating micro-cracks, which compromise the panels’ ability to absorb sunlight. If you don’t have a hose, you can use a spray bottle filled with distilled water.

Apply a Mild Cleaning Solution

Mix a small amount of mild, biodegradable soap with distilled water. Spray this mixture on the panels to tackle stubborn dirt and grime. Avoid using large quantities of soap as it can leave a residue on the glass if not thoroughly rinsed.

Gently Scrub Panels

Use a soft-bristled brush or microfiber cloth to scrub the surface gently. Be careful not to apply excessive pressure, as this can damage the protective coating on the panels. Move from top to bottom to prevent streaking and to avoid dripping dirty water over cleaned areas.

Rinse Again and Dry

Rinse the panels thoroughly with distilled water to remove all traces of soap. Allow the panels to air dry. If you notice water spots, use a soft cloth to gently dry and polish the panels.

Check Performance

Once cleaned, monitor your energy output. Most homeowners report a noticeable increase in efficiency after cleaning, especially if there was significant buildup beforehand. This step validates the effectiveness of your cleaning efforts.

Conclusion

Solar panel washing is a straightforward, affordable way to ensure they perform at their best. With regular cleaning & maintenance, you can boost your energy production, lower utility bills, and prolong the life of your solar system. For those looking to invest in solar panels, JJ Solar offers high-quality solutions tailored to the needs of Indian households and businesses. 

Their systems are designed to deliver optimal performance and are easy to maintain, deciding to go solar both cost-effective and sustainable. Choose JJ Solar and make the right decision for a bright future.

FAQ

1. How often do solar panels need to be cleaned?

For optimal performance, most experts recommend cleaning panels twice a year. However, if you live in an area prone to dust storms, pollution, or pollen, quarterly cleanings may be beneficial.

 2. Which cleaner is best for solar panel cleaning?

Use only mild, eco-friendly soap mixed with distilled water. Avoid strong chemicals or abrasive cleaners, as they can damage your panels.

3. Can I use regular tap water to clean my solar panels?

Tap water can be used but may leave mineral deposits. For best results, use distilled water or rainwater.

4. How much does it cost to clean solar panels in India?

The cost for professional cleaning services in India generally ranges from ₹500 to ₹2,000 per session, depending on the location and number of panels. DIY cleaning is cheaper but requires time and the right equipment.