Cleaning solar panels is an essential step to maintain their efficiency. Over time, dust, pollen and other dirt can accumulate, which reduces the amount of sunlight your panels can capture. This means less electricity produced and, ultimately, a poorer yield. But don’t panic! There are simple and effective methods to keep your panels in perfect condition. In this article, we’ll look together at the five best practices for successful solar panel cleaning, to maximise your energy production and extend the life of your installation.
Key Points
- Regular cleaning of solar panels is important to maintain their performance.
- The frequency of cleaning depends on the environment, but twice a year is often recommended.
- Use lukewarm water and gentle tools to avoid damaging the panels.
- Clean early in the morning or late in the day to avoid thermal shock.
- Regular visual inspection helps detect problems before they worsen.
1. Cleaning frequency
The question of how often to clean your solar panels often comes up. In reality, there is no single answer, as it depends on several factors. The environment in which your panels are installed plays a major role. For example, panels located in urban areas or near agricultural fields will tend to get dirtier faster than those installed in a rural and less polluted environment.
In general, regular cleaning is essential to maintain the optimal performance of your solar panels.
It is often advisable to clean at least twice a year, ideally in spring and autumn. However, in some situations, more frequent cleaning may be necessary.
Here are some things to consider when determining the frequency of cleaning:
- Geographic location: Areas with a lot of air pollution or pollen require more frequent cleaning.
- Panel tilt: Less tilted panels tend to accumulate more dirt.
- Weather conditions: Prolonged periods of drought can lead to dust accumulation.
In areas particularly exposed to pollution, such as industrial or agricultural areas, cleaning every 3 to 4 months may be necessary to optimise the efficiency of solar panels. For residential installations, cleaning solar panels once or twice a year is often sufficient. It is important to adapt the cleaning frequency to your specific situation to ensure optimal energy production. Also consider the impact of flexible photovoltaic panels in nomadic contexts, where exposure to the elements can vary considerably.
2. Preparation
Before you start cleaning your solar panels, adequate preparation is essential. Believe me, it’s like preparing a good meal: if you neglect the initial steps, the end result is likely to be disappointing.
Safety assessment
The first thing to do is to assess the potential risks. Solar panels are often located high up, on roofs. Make sure you have safe and stable access. If you are not comfortable with heights, or if your roof is particularly steep, it is best to call a professional. Don’t take unnecessary risks. Also think about the weather: avoid cleaning your solar panels in windy or rainy weather. Water and electricity don’t mix, and the wind can make the operation dangerous.
Material verification
Before you start, gather all the necessary equipment. This includes a bucket, water, a soft brush or sponge, and possibly a suitable cleaner. Make sure your brush or sponge is clean and in good condition. A dirty or worn brush could scratch the surface of your panels. Also check that your hose is in good condition and that there are no leaks. A regular jet of water is important to rinse the panels after cleaning.
Power cut
This is a crucial step for your safety. Before you start cleaning, cut off the power to your solar system. This can be done by switching off the appropriate circuit breaker in your electrical panel. If you are not sure how to do this, consult a qualified electrician. Safety should always be your top priority. Once the power is off, you can proceed with cleaning with complete peace of mind. Remember to check the battery terminals every three months for optimal maintenance of your installation.
It is important to note that even if the power is off, solar panels can still generate a low voltage when exposed to sunlight. So be careful and avoid touching the connectors or electrical cables.
Preparation of water and cleaner
Use clean water, preferably demineralised water to avoid limescale marks. If you are using a cleaner, make sure it is specifically designed for solar panels. Conventional household cleaners may contain harsh chemicals that could damage the surface of the panels. Dilute the cleaner according to the manufacturer’s instructions. Too much cleaner can leave residues that are difficult to rinse off. If you have a solar panel for an electric car, this step is just as important to maintain its efficiency.
3. Cleaning equipment
For effective and safe cleaning of your solar panels, it is essential to have the right equipment. A poor choice of equipment can damage your panels and reduce their efficiency. Here is a list of what you will need.
Soft brush
A soft-bristled brush is essential for removing dirt and dust without scratching the surface of the panels. Opt for a brush specifically designed for cleaning solar panels, with a telescopic handle to reach hard-to-reach areas. I found a photovoltaic brush that seems perfect for that.
Demineralised water
Tap water often contains minerals that can leave marks on the panels after drying. Use demineralised or osmosis water for impeccable cleaning. You can easily find it in stores or use a water filtration system.
Microfibre cloths
Microfibre cloths are perfect for wiping the panels after rinsing and removing the last traces of water. They are soft, absorbent and do not leave lint. Make sure they are clean before using them.
Garden hose with soft jet nozzle
A garden hose with an adjustable nozzle is needed to rinse the panels after brushing. Use a soft jet to avoid damaging the solar cells. Avoid high-pressure jets, which could be too aggressive.
Telescopic pole
If your panels are located high up or are difficult to access, a telescopic pole is essential. It will allow you to clean the panels safely, without having to climb on the roof. Make sure it is light and easy to handle.
Mild soap (optional)
In some cases, a mild soap may be necessary to remove stubborn stains. Use a soap specifically designed for cleaning solar panels, or a mild dish soap diluted in water. Rinse thoroughly after application.
It is crucial to avoid abrasive products, scouring pads and aggressive cleaners, as they can damage the surface of the panels and reduce their efficiency. Always favour gentle and non-corrosive solutions.
In summary, here is a list of recommended equipment:
- Soft brush with telescopic handle
- Demineralised water
- Microfibre cloths
- Garden hose with soft jet nozzle
- Telescopic pole (if necessary)
- Mild soap (optional)
Remember to check the condition of your equipment before each cleaning and replace it if necessary. Equipment in good condition will guarantee effective and safe cleaning of your solar panels. Also think about the safety of the installation when preparing the equipment.
4. Cleaning process
The process of cleaning solar panels is crucial to maintaining their efficiency. It’s not just about spraying them with water, but about taking a methodical approach to avoid damaging the photovoltaic cells. Here’s how to proceed step by step.
Initial rinsing
Start with a thorough rinse with clean water. Use a garden hose with moderate pressure to remove dust and superficial debris. Avoid high-pressure jets, which could damage the panels. The aim is to prepare the surface for cleaning proper. If you have access to demineralised water, that’s even better, as it won’t leave limescale marks.
Application of the cleaner
If a simple rinse is not enough, prepare a gentle cleaning solution. Use a mild soap or a cleaner specifically designed for solar panels. Avoid abrasive products, harsh detergents and solvents, which could scratch or damage the surface of the panels. Apply the solution with a soft sponge or a soft-bristled brush. Work in small sections to prevent the cleaner from drying before being rinsed.
Manual cleaning
Gently scrub the surface of the panels with the sponge or brush. Insist on particularly dirty areas, but without applying excessive pressure. The aim is to remove dirt without scratching the surface of the panels. Use gentle, circular motions. If you are using a brush, make sure it is clean and in good condition to avoid leaving marks.
Final rinsing
After cleaning the entire surface, rinse thoroughly with clean water to remove any soap residue. Make sure there is no trace of cleaner left, as this could attract dirt and reduce the efficiency of the panels. If possible, use a flexible squeegee to remove excess water and avoid stains. Let the panels dry naturally in the sun.
Drying
Let the panels air dry. Avoid using cloths or towels to dry them, as they could leave lint or marks. If you have used demineralised water, drying will be faster and without marks. Once the panels are dry, you can carry out a visual inspection to check that they are perfectly clean.
It is important to choose the right time to clean your solar panels. Avoid doing it in direct sunlight, as the heat could cause the cleaner to dry too quickly and leave marks. Favour cool mornings or late afternoons, when the panels are less hot.
Special cases
In some situations, additional measures may be necessary. For example, if you live in an area where there are many birds, you may need to regularly remove their droppings. In this case, use a specific cleaner to remove stubborn stains without damaging the panels. Similarly, if you live near an industrial area, you may need to clean your panels more frequently to remove pollution deposits. Consider installing air conditioning for your greenhouse.
5. Visual inspection
After cleaning your solar panels, a step that is often overlooked, but is nevertheless essential, is the visual inspection. It’s a bit like doing a health check after a good spring clean. We check that everything is in order and that there are no small problems that could become big problems later.
The idea is to quickly detect any signs of damage or wear that could affect the performance of your installation. A regular visual inspection can save you costly repairs in the long term. It’s an investment of time that can pay off big time.
Panel verification
Start by carefully examining the surface of each panel. Look for cracks, chips, or discolouration. These defects may indicate a problem with water infiltration or material degradation. Pay particular attention to the edges and corners of the panels, as these are more vulnerable areas. If you notice any anomalies, take photos and note the exact location of the panel concerned. This will make it easier for a professional to work on if intervention is necessary.
Condition of wiring and connectors
Next, check the condition of the wiring and connectors. Make sure there are no bare wires, corroded connectors, or signs of rodents. Damaged wiring can lead to power losses or even short circuits. If you notice any problems, it is imperative to call a qualified electrician to carry out the necessary repairs. Don’t take risks with electricity.
Fixtures and supports
Don’t forget to check the fixings and supports of the panels. Make sure they are tight and that there is no corrosion. Loose fixings can lead to vibrations and movements that damage the panels in the long term. If you notice any problems, tighten the fixings or replace the damaged parts. A well-fixed installation is a durable installation.
A thorough visual inspection is an investment in the longevity of your solar installation. By detecting problems quickly, you can avoid costly repairs and ensure optimal performance of your panels.
Performance monitoring
Finally, regularly monitor the performance of your installation. Compare the current energy production with historical data. An unexplained drop in production may indicate a problem with the panels, the inverter, or the wiring. If you notice a significant drop in production, call a professional to carry out a complete diagnosis. Careful monitoring allows you to react quickly and keep your installation in perfect working order. You can also contact SolarTop for the maintenance of your panels.
In summary, visual inspection is a crucial step to ensure the longevity and performance of your solar panels. Take the time to do it regularly, and don’t hesitate to call a professional if you notice any problems. Your panels will thank you by producing clean and renewable energy for many years to come. Consider contacting SolarTop for custom maintenance contracts.
To learn more about how we check every detail, visit our website. You will find clear and simple information about our inspection methods.
In summary
To keep your solar panels working well, you need to clean them often. It’s simple: regular cleaning, with the right tools, helps to produce more electricity and makes your panels last longer. Remember to check the general condition of your installation from time to time. If you see a problem or if it’s too complicated, don’t hesitate to ask a professional for help. It’s the best way to keep your system at its best.
Frequently Asked Questions
How often should solar panels be cleaned?
The ideal frequency depends on your environment. In general, cleaning twice a year is recommended, especially if you live in a city or near agricultural fields. If your area is less polluted, once a year may be sufficient.
What are the best tools and products for cleaning panels?
It is best to use lukewarm, non-limescale water. For cleaning, a flexible squeegee or a microfibre cloth are perfect. Absolutely avoid hard sponges or brushes that could scratch the surface.
Can solar panels be cleaned in direct sunlight?
No, you should avoid cleaning the panels when they are hot, for example in direct sunlight. This could create thermal shock and damage them. Early morning or late afternoon are the best times.
Is it necessary to cut off the power supply before cleaning?
Yes, it is very important to cut off the power to your system before starting cleaning. This is an essential safety measure to avoid any accidents.
What if the panels are very dirty or have stubborn stains?
If you notice stubborn stains, you can add a little mild soap to the water. But never use strong or abrasive chemicals, as they could damage your panels.
Why is regular panel maintenance so important?
Regular cleaning allows your panels to capture a maximum of light, which ensures optimal electricity production. It also helps to make them last longer by preventing the accumulation of dirt that could damage them.
How to do a good visual inspection after cleaning?
After cleaning, check the condition of the cables, supports and seals. Look for cracks, disconnections or any signs of wear. If you see a problem, it is wise to contact a professional.
When should I call a professional for cleaning?
If your panels are difficult to access, very high, or if you are not sure how to clean them safely, it is strongly recommended to call a professional. They have the necessary equipment and experience.
