Solar Panels Grade: Understanding the Quality Levels

Differentiating A, B, C, and D Grades of Solar Panels

Solar panels are categorized into grades ranging from A to D, with A-grade further divided into A+ and A- grades. Understanding the grade of a solar PV panel is crucial in determining its quality and performance. In this article, we will provide an overview of the various grades and how to assess the grade of a solar panel.

I. Judging the Grade Based on Appearance

1. Surface Examination: Carefully inspect the tempered glass surface for roughness and residual silicone, as these factors can impact the panel's power generation efficiency.
2. Cell Inspection: Check for chipped edges and hidden cracks in the solar cells. Irregular manufacturers may use broken cells for splicing, posing potential risks and compromising safety.
3. Back Quality: Assess the back pressure quality, ensuring it is even without bubbles or folds, indicating higher product quality.
4. Edge Assessment: Examine the panel's edges for flatness and straightness. Some small manufacturers use manual beating frames, resulting in irregular shapes and reduced structural integrity.
5. Silicone Evaluation: Verify if the silicone around the back is evenly distributed and properly penetrated into the gap between the panel and the frame.
6. Welding Examination: Carefully observe the string welding of the solar cells for any signs of leakage. Additionally, check the arrangement of the cells for proper alignment.
7. Junction Box Inspection: Assess the solidity of the junction box and ensure that the junction box cover fits securely. Verify the wire lock's functionality and adjustability.

II. Purchasing Considerations

1. Authorized Dealer: Purchase solar panels from authorized dealer agents of major brand manufacturers. Check for warranty contracts, invoices, and other relevant documents to ensure the purchase of genuine A-grade components and enjoy reliable after-sales support and extended warranties.
2. Market Awareness: With the growing photovoltaic industry, it is essential to be cautious when choosing solar panels. Some smaller module factories buy old cells and reprocess them for resale, resulting in lower-grade B and C modules that may deteriorate within a few years. Opting for A-grade modules ensures excellent performance and a lifespan of at least 25 years.

Understanding the Applications of Different Grade Modules:

1. A-grade modules: Suitable for ground power stations, distributed power stations, and residential systems with a lifespan of 25 years or more.
2. B-grade modules: Primarily used in applications like street lights, off-grid systems, and electric vehicles, with a lifespan of approximately 5 years.
3. C-grade modules: Mainly utilized in underdeveloped areas with limited access to electricity, such as remote regions and specific countries, with an unknown lifespan.

When selecting components for your photovoltaic system, it is crucial not to prioritize small cost savings over component quality. Exercise caution and ensure you are dealing with reputable suppliers. By doing so, you can avoid being misled by unscrupulous businesses and make informed decisions regarding solar panel grade selection.