Photovoltaic panels are all about energy and lower electricity bills. However, to fully utilize their potential, proper maintenance is necessary. The basis that we cannot forget about is maintenance and regular cleaning. In this article, we will take a closer look at the topic of washing photovoltaic panels, its impact on the efficiency of the installation and the best practices in this field.
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The impact of washing photovoltaic panels on energy production efficiency
Photovoltaic panels are advanced devices whose efficiency depends on the amount of light reaching the cells. Even a thin layer of dirt can significantly reduce their efficiency. Studies show that dirty panels can lose up to 25% of their efficiency. This translates directly into the amount of energy produced, and therefore - our bills.
Cleaning photovoltaic panels is therefore necessary and we must take this into account. This is especially important in areas with high dust levels, near busy roads or agricultural areas. Bird droppings, which are extremely difficult to remove by rain alone, can also significantly affect the efficiency of our installation.
It’s worth remembering that solar panels have a surface that’s specifically designed to maximize light absorption. Any dirt on that surface not only blocks the light, but can also change its angle of incidence, which further reduces the efficiency of the panels.
Is it actually worth washing photovoltaic panels?
We often hear that rain is sufficient for cleaning photovoltaic panels. Unfortunately, this is not entirely true. Rain can help remove loose dirt, but it cannot handle more stubborn dirt. What's more, in some cases it can even lead to streaks, which further reduce the efficiency of the panels.
Washing your solar panels becomes especially important in several situations. First, when you notice a drop in energy production. If your system is producing less energy than usual, and the weather conditions haven’t changed, this may be a sign that your panels need cleaning. Second, when your panels are mounted at a shallow angle or on a flat roof. In these cases, rainwater doesn’t drain as efficiently, leaving more dirt behind.
Location is important, as mentioned before. If you live in a dusty area, near fields or busy roads, your panels will need more frequent cleaning. Proximity to trees can also be a problem - resin and pollen can create hard-to-remove deposits on the surface of the panels.
When is the best time to wash solar panels?
Contrary to appearances, time and regularity are important when washing photovoltaic panels. The best time is early morning or late evening. Why? Firstly, the panels are not heated at that time, which reduces the risk of damaging them during washing. Secondly, there is usually less sunlight at these times, which makes it easier to notice dirt.
Early spring is the perfect time for a deep clean. After winter, your panels can accumulate a lot of dirt, which should be removed before the sunniest season. It’s also a good idea to do some additional cleaning in early fall to prepare your system for winter and remove dirt that has accumulated over the summer.
How often you need to wash your car depends on a number of factors. In clean, suburban areas, cleaning once or twice a year may be sufficient. However, in more polluted areas, more frequent cleanings, even every few months, may be necessary.
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What should you use to wash photovoltaic panels to avoid damaging the cells?
Safe cleaning of photovoltaic panels requires the right approach and tools. First of all, avoid using hard brushes or abrasive materials. The surface of the panels is delicate and can be easily scratched, which can permanently reduce their efficiency.
The best solution is to use a soft brush or sponge. It is worth using clean, preferably demineralized water for washing. Tap water can leave a residue on the surface of the panels, which will reduce their efficiency over time.
Aggressive detergents should also be avoided. They can damage the protective coating of the panels and lead to faster degradation of the materials. If water is not enough to remove dirt, you can use mild soap or specialist products designed for cleaning photovoltaic panels.
It is also important not to use high-pressure washers. A strong water jet can damage the seals and cause water to get under the panel, which can lead to corrosion or short circuits.
The best ways to wash photovoltaic panels
There are several proven methods for cleaning photovoltaic panels. The simplest method is to use water and a soft brush. This is a good solution for light dirt, especially if you do it regularly.
For rooftop installations, telescopic systems are a great solution. Special sets with telescopic poles allow for safe cleaning of panels from the ground, eliminating the risks associated with working at height.
For more stubborn stains or large installations, it’s worth considering professional cleaning services. Companies that specialize in cleaning solar panels have the equipment and knowledge to do it effectively and safely.
The photovoltaic and energy storage offer includes modern solutions that make it easier to keep the panels clean:
- The 5kW photovoltaic kit includes JA Solar panels with increased resistance to dirt and a Huawei 5kW hybrid inverter. This is a comprehensive solution that ensures high efficiency and ease of maintenance.
- The 460W LEDVANCE photovoltaic panel features a special coating that facilitates self-cleaning. It offers a 12-year product warranty and a 25-year power output warranty.
- The 440W JA Solar JAM54D40-440/GB BF bifacial, double-sided photovoltaic panel is an advanced technological solution. Made in half-cell technology, it is characterized by lower internal resistance and lower power losses compared to panels with a classic construction. Additionally, thanks to the double-sided construction, this panel can absorb light reflected from the substrate, which increases its efficiency. A 25-year product warranty and a 30-year power output warranty prove the high quality and durability of this solution.
When choosing panels, it is worth paying attention to their resistance to dirt and ease of cleaning. Some models have special hydrophobic coatings that make it easier for water and dirt to run off. Others, on the other hand, may have a more scratch-resistant surface, which is important for regular cleaning.
Regardless of the model you choose, regular cleaning is key to maintaining optimal performance. It is also worth remembering that washing your solar panels yourself can be dangerous, especially in the case of rooftop installations. In such situations, it is better to opt for professional solar panel cleaning.
Therefore, regular and proper washing of photovoltaic panels is a very important activity to maintain high efficiency of the installation. It is worth devoting appropriate attention to this issue so that our investment in PV panels serves us as long and as effectively as possible. Remember that a clean panel is an efficient panel, and an efficient panel means lower electricity bills and a faster return on investment.
Keeping your panels clean is not just a matter of aesthetics, but above all, of economy and energy efficiency. Regular cleaning can significantly extend the life of your panels and maintain their efficiency at a high level for many years. It is an investment that will certainly pay off in the long run.