About the LONGi 620w Bi-facial Hi-MO Solar Panel
The LONGi 620w Bi-facial Hi-MO Solar Panel is a high-performance, utility‑grade photovoltaic module designed for large‑scale solar installations, commercial rooftops, and ground‑mounted solar farms. It belongs to the Hi‑MO 7 series and represents one of the most powerful single solar modules on the market — combining high wattage output, bifacial energy capture, and robust build quality for long-term reliability.
Detailed Features
- High Output Power — 620 W Nominal
- Produces up to 620 watts under standard test conditions, meaning fewer panels are needed to reach a given system capacity.
- Bifacial Design for Dual‑Side Energy Capture
- Uses bifacial solar cell technology: panel captures sunlight on both the front and rear surfaces. Rear surface can absorb light reflected from the ground or surrounding surfaces, boosting overall energy yield.
- Under optimal conditions (high‑albedo surfaces, proper tilt/height), rear-side gain can increase total yield by ~10–25% compared to monofacial modules.
- Advanced Cell Technology – HPDC / Half‑Cell:
- Employs LONGi’s HPDC (High Performance Dual-Cell) solar cell technology and half-cell construction. This reduces resistive and shading losses, improves performance under real-world conditions (low light, partial shading), and enhances durability.
- Improves reliability for long-term solar investment, ensuring stable output over years of operation.
- Robust Thermal & Weather Performance:
- Good temperature coefficient (≈ –0.28%/°C), meaning less performance loss in high ambient temperatures — beneficial in hot climates.
- Mechanically strong: designed to withstand static front loads up to 5,400 Pa, rear loads up to 2,400 Pa — robust against wind, snow (or heavy rain), hail, and other environmental stresses.
- Durable Construction & Long-Term Warranty:
- Dual-glass (or high-spec toughened glass + frame) build, anodised aluminium frame, IP68 junction box and reinforced cabling ensure long life and protection against weather, dust, and moisture.
- Comes with LONGi’s standard 12-year materials & workmanship warranty and a 30‑year linear power output warranty (i.e. guaranteed long-term degradation rate).
Technical Specifications
Mechanical Parameters
- Cell 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 fray
Electrical Characteristics
- Module Type: LR8-66HGD-620M
- Testing Condition: STC
- Maximum Power (Pmax.): 620W
- Open Circuit Voltage: 48..78V
- Short Circuit Current: 16.05A
- Voltage at Maximum Power: 40.91V
- Current at maximum Power: 15.16A
- Module Efficiency: 23.0%
Operating Parameters
- Operational Temperature: -40°C~+85°C
- Power Output: Tolerance: 0~3%
- Voc and Isc Tolerance: ±3%
- Maximum System Voltage: DC1500C (IEC/UL)
- Maximum Series Fuse Rating: 35A
- Nominal Operating Cell Temperature: 45±2°C
- Protection: Class: Class II
- Bifaciality: 80±5%
- Fire Rating: UL type 29, IEC Class C
Mechanical Loading
- Front Side Maximum Static Loading: 5400Pa
- Rear Side Maximum Static Loading: 2400Pa
- Hailstone Test: 25mm Hailstone at the of 23m/s
Temperature Ratings (STC)
- Temperature Coefficient of Isc: +0.045%/°C
- Temperature Coefficient of Voc: -0.230%/°C
- Temperature Coefficient of Pmax: -0.28%/°C
Applications of th LONGi 620w Bi-facial Hi-MO Solar Panel
- Utility‑scale solar farms – Where large capacity and high efficiency reduce land and BOS costs.
- Commercial rooftop installations – Where area is limited and higher wattage modules maximise output.
- Ground‑mounted solar systems with rear‑side reflection – To leverage bifacial gain from albedo surfaces (white roofs, reflective ground cover).
- High‑performance PV systems in hot climates – Low temperature coefficient supports stable output in high ambient temps.