Explained: What Is The Main Reason Behind Corrosion In Solar Panel

rows of solar modules in photovoltaic power station
Representational image. Credit: Canva

Solar panels have emerged as a vital technology in the global effort to transition to clean and renewable energy sources. These photovoltaic (PV) systems are responsible for converting sunlight into electricity, reducing greenhouse gas emissions, and alleviating the world’s dependence on fossil fuels. However, even these cutting-edge systems are not immune to the challenges of wear and tear, and one prevalent issue they encounter is corrosion. In this comprehensive research column, we aim to delve into the primary reason behind the corrosion phenomenon that plagues solar panels.


Corrosion, in its essence, is a natural electrochemical process that affects various materials, with metals and alloys being the most susceptible when exposed to environmental conditions. In the specific context of solar panels, corrosion predominantly targets the metallic components within these systems. This includes elements like the frames, electrical connectors, and sometimes even the internal conductive components. Corrosion can take various forms, such as rust, oxidation, or the general degradation of metallic surfaces. Ultimately, these manifestations of corrosion can lead to diminished solar panel efficiency and a reduced operational lifespan.


Factors Leading to Solar Panel Corrosion


Exposure to Environmental Elements:

Solar panels are meticulously engineered to withstand outdoor conditions, but they are not impervious to the elements. They are often installed in open environments, and exposed to various natural forces such as rain, humidity, temperature fluctuations, and salt-laden air, particularly in coastal regions. The moisture content present in these environmental factors plays a significant role in initiating and promoting the electrochemical reactions that are central to the corrosion process.

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Material Selection:

The selection of materials used in the construction of solar panel components significantly influences their susceptibility to corrosion. For instance, aluminium, renowned for its lightweight properties and corrosion resistance, is frequently employed in the framing of solar panels. Nevertheless, issues arise when aluminium comes into direct contact with dissimilar metals, such as steel or copper, triggering galvanic corrosion and thereby hastening material degradation.

Quality Control and Manufacturing:

Inadequate manufacturing practices can sometimes introduce defects or vulnerabilities in solar panels that exacerbate their susceptibility to corrosion. For example, insufficient sealing around the edges of the panel or substandard coatings may expose sensitive areas to environmental factors, increasing the risk of corrosion.

Neglected Maintenance:

Routine maintenance is imperative for preventing and mitigating corrosion in solar panels. Neglecting the regular cleaning and inspection of solar panels can allow contaminants such as dirt, bird droppings, and salt deposits to accumulate on the panel’s surface. Such accumulations create favorable conditions for corrosion.

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Chemical Exposure:

Specific chemicals present in the environment can act as catalysts for corrosion in solar panels. For example, exposure to acidic rain or pollutants can corrode the metallic components over time. Identifying and addressing such chemical exposures in specific geographic regions are pivotal steps in safeguarding solar panels from corrosion.

Preventing and Mitigating Solar Panel Corrosion

Careful Material Selection: Meticulous consideration of the materials used in solar panel components is fundamental in reducing susceptibility to corrosion. Opting for corrosion-resistant metals and alloys and implementing proper coatings can significantly mitigate the risk.

Routine Maintenance: Regular cleaning and inspection of solar panels are indispensable for preventing the buildup of contaminants that can contribute to corrosion. Cleaning should be performed using gentle detergents and soft brushes to avoid harming the panel’s surface.

Coatings and Protective Measures: The application of protective coatings and films on critical components can add an extra layer of defense against corrosion. These coatings effectively act as barriers to moisture and environmental contaminants.

Environmental Assessment: Conducting thorough assessments of local environmental conditions, including humidity levels, pollution concentrations, and proximity to corrosive agents such as saltwater, can aid in identifying potential corrosion risks. This knowledge can inform mitigation strategies.

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Enhanced Quality Control: Ensuring high-quality manufacturing practices and materials in the production of solar panels can minimize the likelihood of defects and vulnerabilities that contribute to corrosion.


Corrosion is a pervasive challenge that affects the performance and longevity of solar panels. Understanding the key factors behind corrosion, which include exposure to environmental elements, material selection, manufacturing quality, neglected maintenance, and chemical exposure, is imperative for implementing preventive measures. By carefully selecting materials, performing regular maintenance, applying protective coatings, and assessing environmental conditions, the adverse effects of corrosion can be effectively minimized. This ensures that solar panels continue to harness clean and sustainable energy from the sun for extended periods, contributing to a greener and more sustainable future.

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