Uneven color on the surface of solar panels can be caused by a variety of factors. Here are some possible causes of uneven color on the surface of a solar panel.

Pollution and Dust

In outdoor environments, solar panels are susceptible to pollutants such as dust, fallen leaves, bird droppings, etc., which can form spots or stains on the surface of the panels, resulting in uneven color.

Oxidation and Corrosion

The surface of the solar panel may appear uneven in color due to oxidation or corrosion. Long-term exposure to harsh weather conditions, such as high temperature, high humidity, ocean environment, etc., may cause the metal part on the surface of the battery panel to undergo an oxidation reaction, resulting in a color change.

Manufacturing Process

During the manufacturing process of solar panels, certain materials or processes may cause uneven surface color. This may be because the paint or chemical material is not evenly distributed during the application process, or due to other technical factors in the production process.

Component Mismatch

A solar panel is made up of multiple components such as cells, glass, backsheet, etc. These components may come from different suppliers or production lots and may have slight variations in material properties and colors resulting in an uneven appearance of surface color.

Natural Aging

After long-term use, solar panels may experience natural aging and light decay, resulting in uneven surface color.

It is worth noting that uneven color on the surface of a solar panel usually does not seriously affect the performance and efficacy of the panel. It is more of an aesthetic issue and has no direct impact on the energy conversion efficiency of the panels. However, regular cleaning and maintenance of solar panels can help alleviate problems of unevenness caused by contamination and grime.