About the LONGi 620w Bi-facial Hi-MO Solar PanelThe LONGi 635W Bifacial Hi-MO Solar Panel is a premium, next-generation photovoltaic module engineered for superior energy generation, durability, and long-term performance. Designed using advanced cell technology and bifacial architecture, this panel captures sunlight from both the front and rear sides—significantly increasing total energy yield and reducing overall system costs.Detailed FeaturesHigh Output Power — 635 W NominalProduces up to 620 watts under standard test conditions, meaning fewer panels are needed to reach a given system capacity. Advanced Bifacial TechnologyDual-sided energy generation Up to 15–25% additional energy gain depending on installation Higher lifetime energy yield High-Efficiency Cell TechnologyBuilt with advanced N-type / back-contact (BC) or HPBC cell technology, this panel delivers improved performance and reduced energy loss. Enhanced light absorption and efficiency Strong low-light generation Reduced degradation over time Durable Dual-Glass ConstructionThe panel features a robust dual-glass design, providing added strength, protection, and longevity. IP68-rated junction box for weather protection High resistance to moisture, dust, and harsh environments Suitable for extreme weather conditions Built for Reliability & Long LifespanLONGi panels are engineered for long-term performance with industry-leading warranties and minimal degradation. Up to 30-year linear power warranty Low annual degradation rate (~0.35–0.4%) Strong mechanical load resistance (wind, snow, hail)Technical SpecificationsMechanical ParametersCell Orientation: 132 (6×22) Junction Box: IP68, three diodes Output Cable: 4mm², 400, -200mm/±1400mm Glass: Dual glass. 2.0±2.0mm semi-tempered glass Frame: Anodized aluminium alloy frayElectrical CharacteristicsModule Type: LR8-66HTD-635M Testing Condition: STC Maximum Power (Pmax.): 635W Open Circuit Voltage: 49.42V Short Circuit Current: 16.30A Voltage at Maximum Power: 40.68V Current at maximum Power: 15.61A Module Efficiency: 23.51%Operating ParametersOperational Temperature: -40°C~ 85°C Power Output: Tolerance: 0~3% Maximum System Voltage: DC1500C (IEC) Maximum Series Fuse Rating: 35A Nominal Operating Cell Temperature: 45±2°C Protection: Class: Class II Bifaciality: 70±5% Fire Rating: IEC Class CMechanical LoadingFront Side Maximum Static Loading: 5400Pa Rear Side Maximum Static Loading: 2400Pa Hailstone Test: 25mm Hailstone at the of 23m/sTemperature Ratings (STC)Temperature Coefficient of Isc: 0.050%/°C Temperature Coefficient of Voc: -0.230%/°C Temperature Coefficient of Pmax: -0.280%/°CApplications of the LONGi 635w Bi-facial Hi-Mo Solar PanelResidential rooftop solar systems Commercial and industrial installations Ground-mounted solar arrays Solar farms and utility-scale projects Agricultural and off-grid systems
