JA Solar DeepBlue 4.0 Pro JAM66D45 LB 620W Bifacial Solar Panel

The JA Solar DeepBlue 4.0 Pro JAM66D45 LB 620W is a premium high-output photovoltaic module designed for commercial rooftops, industrial projects, ground-mounted solar systems, and utility-scale installations.

Built with advanced N-type bifacial cells, 16BB half-cell technology, and a durable double-glass structure, the panel provides high conversion efficiency, strong low-light performance, reduced degradation, and dependable long-term energy production.

Its bifacial design allows electricity generation from direct sunlight reaching the front surface and reflected light reaching the rear surface. Actual rear-side energy gain depends on the mounting height, surface reflectivity, row spacing, tilt angle, and site conditions.

High 620W Power Output

The JAM66D45-620/LB provides a rated output of 620W with a module efficiency of 23.0%, making it suitable for projects where high power generation and efficient use of installation space are important.

Electrical Performance at STC

• Rated maximum power: 620W
• Module efficiency: 23.0%
• Maximum power voltage: 40.21V
• Maximum power current: 15.42A
• Open-circuit voltage: 48.50V
• Short-circuit current: 16.13A
• Power tolerance: 0 to +3%

N-Type Bifacial Cell Technology

The panel uses advanced N-type bifacial cell technology to provide excellent energy production and stable performance under different operating conditions.

Main Benefits

• Lower light-induced degradation
• High module conversion efficiency
• Better low-irradiance response
• Improved performance in high temperatures
• Front and rear-side electricity generation
• Stable long-term output
• Bifaciality of 80% ±5%

Additional Rear-Side Power Generation

Under the datasheet test condition of 10% rear-side solar irradiation, the 620W model can produce approximately 670W of combined output.

Performance with 10% Rear Irradiation

• Combined maximum power: 670W
• Maximum power voltage: 40.21V
• Maximum power current: 16.65A
• Open-circuit voltage: 48.50V
• Short-circuit current: 17.42A

Actual bifacial power gain will vary depending on the installation design and environmental conditions.

Double-Glass Construction

The solar cells are protected by 2.0mm front glass and 2.0mm rear glass, creating a strong double-glass module structure.

This construction provides enhanced protection against:

• Moisture and humidity
• Temperature changes
• Mechanical stress
• Harsh outdoor conditions
• Long-term environmental exposure
• Potential degradation

Excellent Temperature Performance

The panel has a maximum-power temperature coefficient of -0.290% per °C, helping reduce power losses when module temperature increases.

This makes it suitable for hot and sunny environments where solar panels regularly operate above standard testing temperatures.

Strong Low-Light Performance

The N-type cell design provides reliable generation during lower solar-irradiance conditions, including:

• Early morning
• Late afternoon
• Cloudy weather
• Hazy conditions
• Indirect sunlight

This helps extend useful solar production throughout the day.

High Mechanical Strength

The module is engineered to withstand demanding environmental and structural conditions when correctly installed.

• Maximum front static load: 5400Pa
• Maximum rear static load: 2400Pa
• Module dimensions: 2382 × 1134 × 30mm
• Module weight: 33.1kg

Reliable Outdoor Operation

The panel includes an IP68 junction box with three bypass diodes and supports photovoltaic systems operating at up to 1500V DC.

Operating Conditions

• Maximum system voltage: 1500V DC
• Maximum series fuse rating: 35A
• Operating temperature: -40°C to +85°C
• Safety class: Class II
• Nominal operating cell temperature: 45°C ±2°C

Key Features

• 620W rated output
• 23.0% module efficiency
• N-type bifacial cell technology
• Double-glass module construction
• Advanced 16BB half-cell design
• Front and rear-side power generation
• Up to approximately 670W with 10% rear irradiation
• Bifaciality of 80% ±5%
• Excellent low-light performance
• Reduced temperature-related power losses
• Maximum system voltage of 1500V DC
• IP68 junction box
• Three bypass diodes
• Strong mechanical-load resistance
• Suitable for commercial and utility-scale solar systems

Technical Specifications