How to Check Solar Panel Grade: Identify A, B, C, and D Modules

How to Check Solar Panel Grade: Identify A, B, C, and D Modules

The grades of solar panels can be divided into A grade, B grade, C grade, and D grade, with A grade modules further divided into A+ and A-. The cost gap between these is very large. If you are wondering how to check solar panel grade and what defines each category, here is a brief introduction:

• A-grade modules: A-grade cells are the highest quality cells that can be used in solar modules, ensuring optimal performance and longevity.

• B-grade modules: B-grade cells are slightly lower in efficiency or appearance than A-grade, and the components are downgraded from complete cells.

• C-grade modules: C-grade cells are seriously poor in appearance and have missing corners. They are only suitable for cutting into smaller cells for special needs.

• D-grade modules: D-grade cells are essentially fragments, supplied only to customers with highly specific or low-requirement needs.

How to Check Solar Panel Grade: 7 Visual Steps

To judge the grade of a solar panel and ensure you are getting a quality product, you should evaluate the following key areas:

1. Appearance Judgment

• Surface: Carefully check the tempered glass surface. Products from unreliable manufacturers are often rough. Residual silica gel on the surface will reduce the power generation efficiency of the panel.

• Battery Cells: Check the cells for edge chipping and cracks. Some informal manufacturers use broken battery sheets spliced together. This creates significant safety risks and affects the entire board’s reliability.

• Backplane: Look at the quality of the pressure on the back. If there is unevenness, bubbles, or wrinkles after pressure bearing, it is a low-quality product.

• Frame: Check if it is perfectly straight. Due to low entry barriers in the industry, many small manufacturers use manual framing, resulting in non-rectangular shapes and reduced structural firmness.

• Silica Gel: See if the silica gel is evenly distributed around the back and whether it tightly seals the gap between the backplane and the frame.

• Welding: Carefully observe whether there is any missing welding in the cell strings. Also, check if the arrangement of the cells is uniform and regular.

• Junction Box: Finally, check whether the junction box is firm, whether its cover attaches tightly, and if the outlet wire lock rotates freely and can be securely tightened.

2. Purchase Channels

Always buy from authorized distributors of regular, big-brand manufacturers. Check the quality assurance contracts and invoices. These documents determine whether you are actually purchasing A-level modules and can enjoy reliable after-sales support and the standard 25-year warranty.

What Are A, B, and C Grade Modules Used For?

With the rise of photovoltaic power generation, many module factories have entered the market. Reputable factories have strict inspections and clearly divide modules into A, B, C, and D grades. However, some small factories buy old cells, reprocess them, and sell them as new. Beginners can easily fall into the trap of buying B-level or C-level components that will break within a few years.

Generally speaking, only A-level modules can be marketed openly with guaranteed performance. Here is a comparison of their typical applications:

Therefore, when choosing photovoltaic power plant components, you should not ignore product quality just to save on upfront costs. If you have any questions or need help sourcing quality panels, please feel free to contact us.