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REC REC640AA Pro MG 640W HJT Bifacial Solar Panel
Model REC640AA Pro MG | HJT Bifacial N-Type | 120 Half-Cut Cells | Bifacial | 1500V System Voltage
Product Overview
The REC REC640AA Pro MG 640W HJT bifacial solar panel is engineered for demanding commercial and industrial projects. This high output module uses advanced heterojunction cell technology to deliver impressive 22.5% front side efficiency. Its bifacial design allows additional generation from the rear side, boosting energy yield on reflective surfaces. The panel has been designed for 1500V systems, enabling longer strings and lower balance of system costs. With robust construction, glass on both sides, and an anodized aluminum frame, reliability is enhanced in harsh environments. Backed by long product and power warranties, this REC Alpha Pro MG panel offers strong lifetime performance and stable returns.
Key Benefits
High power density for limited roof space: This panel reaches up to 640 watts in a 2.84 m² footprint. More energy is produced from each mounting position, helping projects reach target output on constrained roofs or ground mount arrays.
Advanced HJT bifacial cell technology: REC heterojunction cells combine crystalline silicon with thin film layers for excellent efficiency. The bifacial design captures light from both sides, improving performance in reflective environments such as white roofs or light gravel.
Strong performance in high temperatures: A low temperature coefficient of -0.24% per °C helps maintain power when modules heat up. Energy production remains more stable during hot summer days compared with many standard modules.
Durable glass-glass construction: Front and rear 2 mm solar glass protects cells from moisture and mechanical stress. The module is tested up to 5400 Pa front load and 2400 Pa rear load, supporting reliable operation in snow, wind, and rooftop conditions.
Long term reliability and low degradation: The REC Alpha Pro MG series is designed for slow output loss over time. A total degradation rate of about 9.25% over 30 years, with 90.75% power guaranteed, supports attractive long term project economics.
How It Works
The REC640AA Pro MG panel converts sunlight into usable DC electricity using high efficiency heterojunction cells. Each cell uses a crystalline silicon wafer combined with thin amorphous layers to improve carrier collection and limit losses. The panel is bifacial, so both the front and rear glass surfaces can capture light that strikes the module. When irradiance hits either side, electrons are excited within the cells and driven into the integrated busbar grid. The connected cells form strings that feed current to the junction box, where bypass diodes protect the module under partial shading. The DC output then flows through DC cabling to an inverter, where it is converted into AC power for building loads or export to the grid.
Heterojunction cell architecture: HJT cells combine n-type crystalline silicon with thin film layers on both sides. This architecture reduces recombination losses and supports higher open circuit voltage and efficiency. Because n-type wafers are used, light induced degradation is greatly reduced compared with many p-type cells.
Bifacial energy capture: The glass-glass construction allows light to reach the rear cell surfaces. Reflected and diffuse light from the roof or ground increases current generation, especially on bright or reflective surfaces. This additional rear side contribution can raise total energy yield beyond the front rated power in optimized layouts.
Twin design and bypass protection: The module uses REC’s split or twin layout, dividing the panel into two electrically independent halves. This configuration helps increase energy harvest under partial shade or soiling, because one half can continue producing when the other half is affected. Three integrated bypass diodes in the IP68 junction box further protect against hot spots and mismatch.
Technical Specifications
| Manufacturer | REC Solar Pte. Ltd., Singapore |
| Model Number | REC640AA Pro MG (REC Alpha Pro MG Series) |
| Cell Technology and Type | Monocrystalline n-type bifacial heterojunction (HJT) |
| Cell Count and Layout | 120 half-cut REC bifacial cells in twin design |
| Bifaciality Factor | Greater than 86% rear side potential |
| Maximum Power Output (Pmax, STC) | 640 Wp (front side rated) |
| Module Efficiency Range | 20.8% to 22.5% depending on watt class |
| Front Side Maximum Power (Alternative Listing) | 487 Wp variant also available in series data |
| Power Tolerance | -3% to +3% production tolerance |
| Nominal Operating Cell Temperature | 44 °C ± 2 °C nominal module operating temperature |
| Voltage at Maximum Power (Vmpp, 640 W) | 37.1 V |
| Current at Maximum Power (Impp, 640 W) | 17.26 A |
| Open Circuit Voltage (Voc, 640 W) | 44.9 V |
| Short Circuit Current (Isc, 640 W) | 17.89 A |
| Voltage at Maximum Power (Vmpp, 487 W) | 35 V |
| Current at Maximum Power (Impp, 487 W) | 13.94 A |
| Open Circuit Voltage (Voc, 487 W) | 42.3 V |
| Short Circuit Current (Isc, 487 W) | 14.45 A |
| Temperature Coefficient of Pmax | -0.24% per °C |
| Temperature Coefficient of Voc | -0.23% per °C |
| Temperature Coefficient of Isc | +0.04% per °C |
| Operating Temperature Range | -40 °C to +85 °C |
| Maximum System Voltage | 1500 V DC (IEC) |
| Maximum Series Fuse Rating | 35 A, maximum reverse current 35 A |
| Mechanical Load Rating (Front) | Tested to +5400 Pa (approx. 551 kg/m²) |
| Mechanical Load Rating (Rear) | Tested to -2400 Pa (approx. 245 kg/m²) |
| Module Dimensions (H x W x D) | 2175 x 1305 x 30 mm (2.84 m²) |
| Weight | 36.8 kg per module |
| Front Glass | 2 mm solar glass with anti-reflection coating |
| Rear Glass | 2 mm solar glass with white grid pattern |
| Frame Material and Color | Anodized aluminum frame, silver finish |
| Junction Box | 3-part junction box with 3 bypass diodes, lead free, IP68 rated |
| Connectors and Cables | PV-JM608 connectors, IP68 when mated, 4 mm² solar cable, 0.3 m + 0.3 m length |
| Panels per Pallet | 33 modules per pallet |
| Panels per 40 ft Container | Up to 528 modules (16 pallets) in 40 ft high cube |
| Panels per 13.6 m Truck | Approximately 594 modules (18 pallets) |
Certifications & Compliance
Certifications: Designed and tested in accordance with IEC standards for crystalline silicon modules and junction box safety, including IEC 62790 and IEC 62852 for components. Module level certifications follow the REC Alpha Pro MG series global compliance program.
Inverter Compatibility: Suitable for use with modern string, central, and hybrid inverters that support 1500V DC systems. Always verify voltage window, current limits, and string sizing in the selected inverter datasheet before final design approval.
Environmental: Built with durable glass-glass construction for long life in harsh climates. Tested for high mechanical loads, humidity, and temperature cycling to support rooftop and ground mount applications in a wide range of environments.
Warranty: 30 year product warranty and 30 year power warranty are available on the REC640AA Pro MG. The performance guarantee specifies 90.75% of rated power at year 30, corresponding to an approximate 0.31% annual degradation rate under standard testing conditions.
Documentation
Product Datasheet (PDF)● Available | Contact us for lead time and pricing
Specifications & Documents: Full specifications & datasheet for REC Solar REC640AA Pro MG
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| Manufacturer | PES Supply |
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