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Investing in Residential Solar Systems is one of the smartest decisions Australian homeowners can make to reduce electricity bills and embrace sustainable energy. However, to get the most out of your investment, regular maintenance is essential. Understanding how to clean solar panels properly ensures your system operates at peak efficiency, maximising energy production and protecting your long-term savings.
Why Solar Panel Cleaning Matters
Dirty solar panels can lose up to 25% of their energy output due to accumulated dust, dirt, bird droppings, and debris. Even a thin layer of grime significantly reduces your panels’ ability to absorb sunlight and convert it into electricity. This directly impacts your energy savings and the return on your solar investment.
Regular Solar Panel Maintenance helps maintain optimal performance, extends the lifespan of your system, and ensures you’re getting the maximum benefit from Australia’s abundant sunshine. When panels are clean, they work more efficiently, saving you money on energy bills and reducing your environmental footprint.
How Often Should You Clean Your Solar Panels?
Most experts recommend cleaning solar panels at least twice a year to maintain peak efficiency. However, the ideal frequency depends on several factors specific to your location and environment.
If you live in urban areas with high pollution, near busy highways, or in regions with frequent dust storms, you may need to clean your panels every three to four months. Properties surrounded by trees often accumulate leaves and bird droppings, requiring more frequent attention, especially during autumn.
Coastal areas face unique challenges with salt spray buildup, while rural properties near farmland may experience dust accumulation during ploughing seasons. Monitoring your system’s energy output through your inverter or monitoring app can help you determine when cleaning is necessary. A noticeable drop in production often signals it’s time for a thorough clean.
How Do You Clean Solar Panels Safely?
Before attempting to clean solar panels yourself, safety should be your top priority. Many panels are installed on rooftops, making the cleaning process potentially dangerous. If you’re uncomfortable working at heights or your roof is steep, hiring a professional solar panel cleaning service is strongly recommended.
For those who choose DIY cleaning, here’s a step-by-step guide on how to clean solar panels on roof installations safely:
Step 1: Choose the Right Time
Clean your panels during early morning or late evening when they’re cool. Cleaning hot panels in direct sunlight causes water to evaporate too quickly, leaving streaks and potentially damaging the panels with thermal shock.
Step 2: Turn Off Your System
Before cleaning, safely shut down your solar system according to the manufacturer’s instructions. This prevents any electrical hazards during the cleaning process.
Step 3: Remove Loose Debris
Use a soft-bristled brush or leaf blower to gently remove loose dirt, leaves, and debris from the panel surface. This makes the washing process much easier and more effective.
Step 4: Prepare Your Cleaning Solution
Mix lukewarm water with a small amount of mild dish soap, or use a cleaning solution specifically designed for solar panels. Avoid harsh chemicals, abrasive cleaners, or high-alkaline products that can damage the panels’ protective coating.
Step 5: Wash Gently
Using a soft cloth, sponge, or squeegee with an extended handle, gently wash the panels with your cleaning solution. Work in sections to ensure thorough coverage without applying excessive pressure.
Step 6: Rinse Thoroughly
Rinse the panels completely with clean water using a garden hose with a gentle spray nozzle. Ensure all soap residue is removed, as leftover cleaning solution can attract more dirt.
Step 7: Air Dry
Allow the panels to air dry naturally, or use a soft, clean cloth to prevent water spots. Never walk on the panels, as this can cause physical damage and void your warranty.
What to Avoid When Cleaning Solar Panels
- Knowing what not to do is just as important as understanding proper cleaning techniques.
- Never use pressure washers or high-pressure hoses, as they can crack the glass, damage seals, and compromise the panels’ waterproof integrity.
- Avoid abrasive materials like scouring pads, steel wool, or stiff brushes that can scratch the panel surface. These scratches reduce efficiency by scattering light and creating points where dirt accumulates more easily.
- Don’t use harsh chemicals, solvents, or detergents not specifically approved for solar panels. These can strip protective coatings and cause long-term damage.
- Similarly, avoid cleaning with hard water or mineral-rich water, as it leaves deposits that block sunlight.
- Never attempt cleaning during windy conditions or on hot, sunny days. Wind can blow debris onto wet panels, while cleaning hot surfaces creates safety hazards and increases the risk of thermal damage.
Professional Solar Panel Cleaning Services
- While DIY cleaning works for easily accessible systems, professional solar panel cleaning offers significant advantages.
- Trained technicians have specialised equipment, safety gear, and expertise to clean panels thoroughly without causing damage.
- Professional cleaners use purified or deionised water that doesn’t leave mineral deposits, ensuring a streak-free finish.
- They’re trained to identify potential issues like cracks, loose wiring, or failing seals during the cleaning process, potentially saving you from costly repairs later.
- Many companies also combine cleaning with a full Solar Panel Risk Assessment to ensure every component is functioning safely and efficiently.
Solar Panel Cleaning Cost in Australia
The solar panel cleaning cost varies across Australia depending on several factors. Most homeowners can expect to pay between $12 and $20 per panel for professional cleaning services. For an average residential system of 20-25 panels, total costs typically range from $240 to $500.
Several factors influence pricing, including the number of panels, roof accessibility, property location, and the level of dirt buildup. Ground-mounted panels are generally cheaper to clean than roof-mounted systems. Steeper roofs requiring specialised safety equipment increase costs due to additional labour and safety requirements.
Metropolitan areas like Sydney, Melbourne, and Brisbane often have more competitive pricing due to greater service availability, while regional areas may charge higher rates to cover travel costs. Some companies offer package deals or discounts for regular maintenance schedules, which can reduce long-term cleaning expenses.
Despite the initial cost, clean panels can produce up to 25% more energy, easily offsetting the cleaning expense—especially considering increasing solar modules cost and the value of protecting your investment.
Maximising Your Solar Panel Efficiency
Beyond regular cleaning, several practices help maintain optimal solar panel performance.
Trim overhanging branches that cast shadows on your panels or drop leaves and debris. Shadows significantly reduce energy production, even on partially shaded panels.
Monitor your system’s performance regularly through your inverter display or monitoring app. Sudden drops in energy production can indicate cleaning needs or potential technical issues requiring professional attention.
Schedule inspections alongside cleanings to check for physical damage, loose connections, or degrading components. Early detection of problems prevents minor issues from becoming expensive repairs.
Consider your local climate when planning maintenance. Areas with minimal rainfall require more frequent cleaning, while regions with regular rain may benefit from natural rinsing. However, rain alone doesn’t remove sticky substances like bird droppings or tree sap, making periodic thorough cleaning still necessary.
Conclusion
Understanding how to clean solar panels properly is essential for every solar system owner. Whether you choose DIY cleaning or professional services, prioritising safety and using appropriate techniques ensures your panels continue generating clean, renewable energy for decades.
Don’t let accumulated dirt and grime diminish your solar investment—make cleaning solar panels a regular part of your home maintenance routine.
At SPS Energy, we’re committed to helping Australian homeowners get the most from their solar systems. From expert advice and Solar Installation Services or professional cleaning services, contact our team today.
