640W Longi Hi-Mo9 Bifacial LR8-66HYD

The LONGi Hi-MO 9 LR8-66HYD-640M is a premium 640W bifacial solar panel designed for utility-scale, commercial, industrial, and large residential solar installations. Built with LONGi's advanced BC (Back Contact) cell technology, this high-efficiency module delivers exceptional energy generation, improved temperature performance, and long-term reliability in demanding environments. With a module efficiency of up to 23.7%, the Hi-MO 9 series maximizes power output while reducing overall system costs.

The bifacial dual-glass design enables the panel to capture sunlight from both the front and rear sides, increasing total energy yield depending on installation conditions. The robust construction includes weather-resistant semi-tempered dual glass, an anodized aluminum frame, and LONGi's Sea-Shield technology, making it highly resistant to humidity, salt spray, and corrosive coastal environments. 

Engineered for long-term performance, the LONGi LR8-66HYD-640M features less than 1% first-year power degradation and only 0.35% annual degradation from years 2 to 30, ensuring excellent lifetime energy production. The module is backed by a 12-year product warranty and a 30-year linear power output warranty for added peace of mind. 

Key Features

• Rated Power Output: 640W
• Model: LONGi Hi-MO 9 LR8-66HYD-640M
• Bifacial Dual-Glass Solar Module
• Advanced BC Cell Technology
• Module Efficiency: 23.7%
• Positive Power Tolerance: 0~3%
• Maximum System Voltage: 1500V DC
• Maximum Series Fuse Rating: 35A
• First-Year Degradation: Less than 1%
• Annual Degradation (Years 2–30): 0.35%
• Sea-Shield corrosion-resistant design for coastal and high-humidity environments
• Front Load Capacity: 5400Pa
• Rear Load Capacity: 2400Pa
• Operating Temperature Range: -40°C to +85°C
• IEC, UL, ISO Certified
• 12-Year Product Warranty
• 30-Year Linear Performance Warranty 

Technical Specifications

• Maximum Power (Pmax): 640W
• Open Circuit Voltage (Voc): 49.52V
• Short Circuit Current (Isc): 16.38A
• Voltage at Maximum Power (Vmp): 40.78V
• Current at Maximum Power (Imp): 15.69A
• Dimensions: 2382 × 1134 × 30mm
• Weight: 41.6kg
• Cell Configuration: 132 Cells (6 × 22)
• Protection Class: Class II
• Nominal Operating Cell Temperature (NOCT): 45 ± 2°C
• Bifaciality: 75 ± 5% 

Applications

The LONGi Hi-MO 9 640W Bifacial Solar Panel is ideal for:

• Utility-scale solar farms
• Commercial and industrial rooftop systems
• Ground-mounted solar projects
• Agricultural solar installations
• Coastal and high-corrosion environments
• High-performance solar energy systems requiring maximum power density

Why Choose the LONGi Hi-MO 9 640W Bifacial Panel?

The LONGi LR8-66HYD-640M combines industry-leading efficiency, advanced bifacial energy generation, exceptional durability, and proven long-term reliability. Designed to maximize energy production and lower the levelized cost of electricity (LCOE), it is an excellent choice for professional solar installations seeking premium performance and long-term investment value.