If the solar modules are installed professionally, experts recommend a complete Photovoltaic cleaning only every two years. This is because they usually clean themselves due to the angle of inclination caused by rain and snow. However, to ensure that the full potential of the solar system can always be exploited, it is essential to keep a constant eye on the degree of soiling. However, the cleaning cycle should be increased if there is a rapid drop in performance. Also Special cleaning are necessary after a Saharan dust shower, for example. A Regular cleaning of the solar cells increased always the PV yield and extends the Longevityt of the systems.
What are the benefits of photovoltaic cleaning?
Photovoltaic systems are usually installed outdoors and are therefore exposed to wind, rain and other environmental influences. Over time, dirt, dust, pollen, moss, bird droppings and other soiling can accumulate on the solar cells. These deposits reduce the Light transmission and impair the cells' ability to efficiently convert solar energy into electrical energy. This reduces the output of the photovoltaic system and electricity generation becomes inefficient. There is also a risk that warranty claims will be voided.
Effects of a dirty photovoltaic system
Efficiency is reduced: Dirt on the solar cells leads to lower light absorption and therefore to a reduced efficiency of the photovoltaic system. This means that less sunlight is converted into electrical energy, resulting in lower electricity production.
Amortization times are longer: Due to a reduced output of the photovoltaic system, the investment costs flow back more slowly and the amortization times are longer. However, shorter payback periods are important in order to make solar systems economically viable.
The service life of the solar modules is shortened: A dirty system can affect the service life of the solar cells, as they have to work under unfavorable conditions. Regular cleaning can help to extend the service life of the system and reduce maintenance costs.
Photovoltaic cleaning methods
Mechanical cleaning: This method involves the use of brushes, wipers or compressed air to remove dirt from the solar cells. This method is simple and inexpensive, but requires access to the system and is not always effective for stubborn dirt.
Water-based cleaning: This involves rinsing the system with low-limescale water to rinse off the dirt. Sometimes special cleaning agents are added to dissolve stubborn dirt. Such cleaning agents must be environmentally friendly and not too harsh so as not to damage the photovoltaic system.
Automated cleaning: An increasingly popular method is the use of specialized cleaning robots that can clean solar cells autonomously. These robots often use rotating brushes or water-based cleaning systems and can efficiently handle large solar fields.
Costs & sustainability of photovoltaic cleaning
Regular photovoltaic cleaning is essential to maintain the efficiency of the system, extend its service life and guarantee sustainable and efficient PV power generation. Effective cleaning methods for commercial photovoltaic systems can also be easily carried out by the user, provided the solar modules are easily accessible and safety precautions are in place. This is usually the case on flat roofs or solar parks in particular. In the case of pitched roofs, solar carports or special PV systems, it is advisable to commission professional cleaning companies. For large-scale PV systems, the prices are usually a matter of negotiation and potential clients should obtain various offers in advance. The cleaning companies usually calculate the costs according to the accessibility of the modules, the size of the system, the degree of soiling and the use of possible cleaning agents.