How to Clean Solar Panels: A Guide for Ground-Mount and Roof-Mount Systems
With over 10 years of experience in the solar industry, we specialize in manufacturing high-performance solar mounting systems and provide professional-grade cleaning solutions designed to maximize the efficiency and longevity of solar installations. In this article, we explore four common methods for cleaning solar panels and answer some frequently asked questions.
4 Common Solar Panel Cleaning Methods
1. Manual Dry Cleaning
Manual dry cleaning is a straightforward and effective method for removing dust from solar panels. Using a long-handled electrostatic dust mop and specialized cleaning agents, this approach relies on static electricity to attract dust and sand without spreading particles into the air.
Drawbacks:
- Pressure applied may vary between operators, potentially leading to micro-cracks in solar cells.
- Residual dust from the mop can cause shadows, reducing panel efficiency.
2. Manual Wet Cleaning
This method involves using water vehicles (e.g., water-tank trucks or tractors) equipped with spray nozzles under ≤0.4MPa water pressure. The cost for manual water cleaning is approximately $0.03 per square meter (¥0.2/m²), similar to the price of dry cleaning but requires a two-person team—one to drive the vehicle and another to operate the spray.
Drawbacks:
- High water pressure may cause micro-cracks in cells.
- Water stains left after air-drying can form shade patterns, impacting performance.
3. Mechanical Cleaning Vehicles
Mechanical cleaners are vehicles designed to drive between solar panel rows, spraying and rinsing panels automatically. This approach reduces labor but requires wide spacing between rows. The equipment is often bulky and may clean unevenly.
4. Cleaning Robots
Robotic cleaners save water and labor while improving accessibility in tight spaces. They can be operated remotely and scheduled flexibly. However, they may struggle with stubborn stains.
Each method has its pros and cons. Your choice should consider site conditions, installation type, and budget.
FAQ About Solar Panel Cleaning
How to Clean Ground-Mount Solar Panels
Ground-mounted solar panels are generally easier to clean due to their accessibility.
Steps:
- Use a soft brush or extended mop to remove loose debris.
- Gently rinse with low-pressure water (<0.4MPa).
- Apply a solar-safe cleaning solution if needed.
- Wipe or rinse thoroughly to avoid residue.
Tip: Avoid high-pressure washers to prevent damaging the panels or seals.
How to Clean Roof-Mounted Solar Panels
Cleaning roof-mounted panels requires extra safety measures.
Steps:
- Prioritize safety: use a stable ladder and harness if needed.
- Use a long-handle soft brush or robotic cleaner designed for roofs.
- Clean early in the morning or on cloudy days to avoid rapid drying and streaks.
- Lightly spray with water—avoid excessive water near electrical components.
Recommendation: If the roof is steep or high, consider hiring professionals.
How Often to Clean Ground-Mount Solar Panels
The cleaning frequency depends on local environment:
- In dusty or arid areas: every 2–4 months.
- In regions with bird activity or pollen: monthly during peak seasons.
- In areas with frequent rain: every 6 months may suffice.
Regular visual inspection helps determine soiling levels.
Maximize Your Solar Investment with Proper Maintenance
Choosing the right cleaning method and frequency can significantly improve energy generation. We offer a range of solar mounting systems and cleaning tools designed for efficiency and safety. Contact us to learn more or request a product catalog!
