I. Grading
What determines the grade?
Regarding grading practices, here is how grades are viewed: A, B, C (Domestic manufacturers generally classify modules into A, B, and C grades based on performance and appearance; Grade A modules offer excellent performance—typically high efficiency and consistent electrical characteristics—and a lifespan of at least 25 years); A1, A2, A3 (These can be further subdivided based on product quality; Grade A1 refers to modules with highly consistent color and electrical properties); A+, A- (Grade A modules can be divided into two grades: A+ and A-; the same applies to Grade B; there is also a significant cost difference between these solar panel grades); Three-level/Tier 3 (Domestic manufacturers generally classify modules into A, B, and C grades based on performance and appearance); A, B, C, D (Grade A cells are the highest quality cells used in modules; Grade B cells are slightly below Grade A but are intact cells that can be used in lower-grade modules; Grade C cells have severe cosmetic defects or chipped corners; Grade D cells are broken); Three-star (CQC Comprehensive Quality Grade Certification Rules CQC53-471547-2020: 3-star rating requires >75% of the score to come from leading-edge quality indicators; 2-star requires 50%–75%; 1-star requires ≤50%). In summary, there are six ways to view grading: A/B/C, A1/A2/A3, A+/A-, Three-level, A/B/C/D, and Three-star.
II.
Appearance
What to look for regarding appearance.
Based on visual inspection practices, here is what to look for: Grade A (flawless, uniform color, neat edges, high conversion efficiency—usually ≥20%); Grade B (slight color difference, small notches or slight scratches on the edges, slightly lower efficiency—about 1–3% lower than Grade A); Grade A (represents the top tier; panels have no visible defects, scratches, discoloration, or cell misalignment; manufacturers reserve the Grade A designation for panels that pass every inspection without compromise); Color Difference (Grade A cells have no surface blemishes, though there may be very minor scratches; Grade B cells may exhibit defects such as paste leakage, broken busbars, poor printing, or scratches; Grade C cells have multiple defects, such as chipped edges or being reclaimed cells); Micro-cracks (Grade A modules are genuine, high-quality products with no defects, high efficiency, and full power output; Grade B modules are secondary products with minor micro-cracks or color differences; Grade C modules are defective products with obvious broken cells or cracks); 1-Foot Rule (Grade A modules are visually flawless from a distance of about 1 foot; Grade B modules have minor cosmetic flaws apparent up to 7 feet away but are nearly undetectable beyond that distance)—Six visual criteria: Grade A, Grade B, Grade A, Color Difference, Micro-cracks, and the 1-Foot Rule; a comprehensive visual assessment.
III.
Performance
What to look for regarding performance.
Performance assessment criteria: Efficiency—LinkSolar (A-grade meets all datasheet specifications, no visible defects, clean EL image; B-grade falls slightly below spec on one or more parameters, typically 1–3% lower efficiency); Power—SolarSquare (Grade A delivers rated power, has stable output, and matches well with other cells; Grade A features flawless appearance and uniform color); Warranty—LinkSolar (These go into branded modules sold with full warranties); Datasheet—RENVU (B-Grade modules exhibit only visual defects and fully meet all datasheet performance specifications); Efficiency—JINGSUN (Grade A offers high conversion efficiency, usually ≥20%; Grade B has slightly lower efficiency, about 1–3% lower than Grade A); Power—HBOWA (A-grade panels meet all manufacturer-stated power output requirements and come with a full warranty)—Six key performance indicators: efficiency, power, warranty, datasheet, efficiency, and power; a comprehensive performance evaluation.
IV.
Applications
What to look for regarding applications.
Based on practical application, consider the following six perspectives: Class A—Jiangsu PV Industry Association (Class A modules are primarily used for ground-mounted, distributed, and residential systems with a lifespan of over 25 years; priced around 3 RMB/W); Class B—Jiangsu PV Industry Association (Class B modules are mainly used for streetlights, off-grid systems, and electric vehicles with a lifespan of 5 years; these are either downgraded Class A modules or made from Class B materials; priced around 2–3 RMB/W); Export—Essolx (Class A: export markets, commercial and utility-scale projects, high-quality residential installations; Class B: cost-sensitive markets, domestic installations, budget-oriented solar projects); Region—Yuanchuangli Documents (Class A: developed countries/regions like Europe, the US, Canada, Japan, and Australia; Class B: Southeast Asia, the Middle East, Africa, etc.; Class C: domestic clients and internal company use; Class D: retail customers in Western China, restricted to neutral labeling); Residential—Toutiao (Class A: genuine, high-quality modules essential for standard residential power stations; Class B: substandard modules lacking formal warranties, with short lifespans and rapid degradation); Top-tier—ClimateTechReview (Grade A: highest quality tier, exceptional performance and durability, designed for full utilization, ideal for residential rooftops to large-scale solar farms; Grade B: slightly lower quality, reliable performance, minor imperfections)—Six perspectives on application: Class A, Class B, Export, Region, Residential, and Top-tier; a comprehensive look at application scenarios.
V.
Purchasing
What to look for when purchasing.
When purchasing, consider these six factors: **Counterfeits** (many sellers label B-Grade or even rejected panels as A-Grade to charge premium prices, or sell locally assembled panels—made from leftover or damaged cells from Chinese factories—as branded A-Grade products); **Authenticity Verification** (how to distinguish between A, B, and C grades and avoid buying defective goods); **Efficiency (16–19%)** (Grade B panels generally offer medium-to-high efficiency of 16–19% or more, though they often exhibit visual defects that do not significantly impact power output or module operation); **Tolerances** (Class B panels use similar materials but allow for slightly larger visual and manufacturing tolerances, making them more cost-effective); **Value for Money** (B-Grade panels exhibit visual defects but fully meet datasheet specifications); and **Genuine Products** (A-Grade panels command the highest prices and are typically used in residential installations where both aesthetics and performance matter).
By evaluating these six aspects—counterfeits, authenticity, efficiency, tolerances, value, and genuineness—you can make an informed purchasing decision.
Conclusion
Regarding the differences between Grade A and Grade B photovoltaic (PV) module components, the distinction can be summarized across five key areas: grading, appearance, performance, application, and purchasing considerations.
Grading—PV Home (modules classified as A, B, or C based on performance and appearance; Grade A has a lifespan of at least 25 years); PV Industry Network (Grade A1 features highly consistent color and electrical properties); TYCORUN (Grade A is subdivided into A+ and A-); Polaris (factory inspection classifies modules into A, B, and C grades); Toutiao (Grade A cells represent the highest quality; Grade B can be used in downgraded applications); CQC (comprehensive quality rating where >75% meet the 3-star standard); Appearance—JINGSUN (Grade A: flawless, uniform color, neat edges); JINGSUN (Grade B: slight color difference, chipped corners, scratches); Infinity Solar (Grade A: no scratches, discoloration, or cell misalignment; passes all inspections); Xiangyang Energy (Grade A: flawless; Grade B: paste leakage, broken busbars, incomplete printing, scratches); Toutiao (Grade A: flawless; Grade B: micro-cracks, color difference; Grade C: broken cells, cracks); RENVU (Grade A: flawless at 1 foot; Grade B: defects visible at 7 feet); Performance—LinkSolar (Grade A: meets datasheet specifications, clean EL image); SolarSquare (Grade A: stable rated power output); LinkSolar (Grade A: comes with full warranty, branded module); RENVU (Grade B: visual defects only, fully meets datasheet performance specs); JINGSUN (Grade A: efficiency ≥20%); HBOWA (Grade A: meets manufacturer-stated power output); Application—Jiangsu PV Industry Association (Grade A: for ground-mounted, distributed, and residential power plants; 25-year lifespan); Jiangsu PV Industry Association (Grade B: for streetlights, off-grid systems, and e-vehicles; 5-year lifespan; priced at 2–3 RMB/W); Essolx (A
