In the production process, We make sure our qulaity checks are taken each stage of the production process and we will make sure industry's most reliable panels. In addition to our high-quality solar panels, we also specialize in OEM and custom made solar panels that fit special application needs. SLG Solar has the proven agility and engineering expertise to meet partner objectives of nearly any capacity.

Eendured for a long lasting

Each solar cell is inspected visually for possible damage and tested for specific tension and efficiency.

Cells are classified according to color and power level, a step that most manufacturers skip. This increases aesthetic appearance of our panels while ensuring the highest power delivery. Mismatches in cell power lead to module energy losses.

The next step is the stringing process. We connect the front of each cell to the back of the adjacent cell via three soldering strips in an automated process called three-busbar technology. We use three busbars to create redundancy:

If one busbar stops working, then the cell will still produce power. The materials we use in the stringing process are carefully selected to ensure the integrity of the joints when they expand and contract with changing weather conditions.

Flawless cell soldering is crucial to the quality of our solar panels, which is why we rely on a highly automated and monitored process.

We then perform a regular peel test to monitor the soldering quality of the string production. Additional visual inspection of strings ensures there were no errors in cell print, cracks in the cells, mechanical damage or color deviations.

Encapsulating Solar cells strings

The laminator contains a huge vacuum oven that bonds the laminate structure at high temperatures to a weather - and shock-resistant unit. Our experienced panel specialists carefully examine the resulting laminates. Only laminates featuring the front, back and edges in perfect condition pass to the next processing stage. We then check for stable and resilient bonding among individual laminate components with regular peel tests, which prevents the separation of individual unit components

The laminate structure consists of the solar glass, two ethylenevinyl acetate (EVA) sheets, the solar cell matrix and the back sheet, which are all sandwiched together. The structure is carefully examined for cell cracks and possible contact interruptions using sophisticated imaging measurements. Our experts also check for even spacing between cell strings and for impurities in laminates. Only laminates in perfect condition are approved for further processing


Automated framing station, where they are assembled with an aluminum frame and corner keys. These castaluminum corner keys represent our third-generation evolution—at a time when many other manufacturers are still on their first—creating a joint that will not loosen over time. Then, our frames are filled with two-component silicone. Our quality experts continually check the silicone mixture for correct component ratios and measure the hardness of the silicon after 24 hours to ensure an extremely stable laminate-to-frame connection.

Connecting Points

Junction boxes efficiently dissipate heat to safely maintain an ideal temperature. The connection boxes are welded to contacts, resulting in superior endurance over soldering under real-world conditions. These fused connections ensure optimum safety at peak mechanical and thermal loads. The connection boxes are filled with high-quality silicone to protect against corrosion and mechanical loads, then systematically tested to ensure a perfect connection on every panel.

Proven performance

After framing and Junction Box fitting, the performance of every SolarWorld panel is measured in a flasher, which is one of our most critical tests. Under standard test conditions (1,000 W/m2 at 25°C & 1.5 AM) the panel is flashed with a light spectrum at an angle of 90 degrees. The current-voltage characteristic records the actual performance of the solar panel and tests electrical safety.

Using these results, our solar panels are categorized according to performance during a process we call “plus-sorting.” Only those panels that demonstrate a nominal power performance or higher move forward, making this process synonymous with the highest level of efficiency.

Final packaging and shipping inspections

Final packaging and shipping inspections are performed before our products are packed and ready to leave the factory. Our staff works in strict conformity with product specification requirements at every step in the production process, engage in self - and cross inspections and perform random sample testing. We have also set up a module reliability inspection system, which tests the reliability of all the supplementary parts and materials for our modules. Furthermore, annual third-party testing is conducted by TUV