Experts reveal the dangers of using this basic cleaning product on solar panels and how it can compromise their efficiency and durability.
A survey by University of Turku, in Finland, brought new information about the influence of household cleaning products on the efficiency of solar panels.
The study highlighted how different chemical agents can affect the ability of the glass covering the panels to transmit light, an essential element for operation optimized solar panels.
Solar panels rely on their maximum capacity to absorb solar radiation. However, accumulated dirt and even damage caused by improper cleaning can significantly compromise this process. Therefore, finding the safest and most efficient method for cleaning panels becomes crucial.
Tests with different products for cleaning solar panels
The study looked at the effectiveness of products such as common glass cleaners and isopropanol. The good news is that these products proved to be suitable for cleaning while preserving the optical properties of the glass studied.
However, the results were different when dishwashing detergent was used. Light transmission on glass cleaned with detergent was lower than on glass that was still dirty.
Materials engineering professor Kati Miettunen explained that although the glass looks clean after applying detergent, its ability to transmit light decreases dramatically.
He highlighted the importance of preserving the anti-reflective coating present on solar panels, which is sensitive to unsuitable products and aggressive cleaning methods, such as high-pressure washers.
Why is detergent not recommended?
The study found that the detergent did not directly damage the glass. However, rinsing did not appear to be enough to restore its original transparency.
Assistant researcher Julianna Varjopuro emphasized that, even with a clean appearance, light transmission is impaired, compromising the panel's performance.
The research also found that a commercial cleaner specifically for glass and mirrors, from the Mellerud brand, performed almost as efficiently as products developed exclusively for cleaning solar panels.
Relevance for the energy transition
This work was conducted by the Solar Energy Materials and Systems (SEMS) research group within the RealSolar project, which seeks to integrate solar energy into the Finnish energy system. The results were presented at the 41st European Solar Photovoltaic Conference, highlighting the importance of affordable and effective maintenance practices to democratize the use of solar energy.
With detailed information and practical tests, the study provides valuable guidance for solar energy users, reinforcing the need to pay attention to the type of product used in equipment maintenance.