The superior performance bifacial panel generates energy from both sides, 425watt from the top glass and an additional 90 watts from the bottom. Full Black Frame & Cells.
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Renesola Saturn - Bi-Facial 425W+90W Solar Panel with Double Glass

The bifacial panel will catch the sun rays from different directions, the back side of the glass can absorb the light from reflection and generate up to 90W additional energy.

The unique feature of these panels is the additional energy production from the back side due to the radiation being reflected on the ground. The amount of energy depends on the following factors:

Albedo Factor is the amount of sunlight diffusely reflected by an object and varies according to the time of year, the season and the material covering the ground. 

Solar Panel Features

• Bifacial technology enables additional energy production from the rear side of the panel by up to 20% 
• Glass-to-glass lamination extends the product life to 30 years with annual power degradation of less than 0.4% 
• The hot spot risk is reduced which is the main cause for early failures.
• The power and heat are evenly distributed on both sides of the panel.
• Half-cut solar panels have 50% shorter internal wiring, hence 50% lower resistance losses. 
• Thinner inter-cell busbars mean more sunlight can be absorbed.
• Can be installed at different angles even 90 deg vertically, it must always face the equator.

P-Type /Positive power tolerance of 0~+3%/Max module efficiency 21.77%

Ideal for ground mounting installation and flat roofs. It is not recommended for tiled roofs. The back side of the panel will generate additional energy by light reflection.

Dual Glass Solar Panel- Befit and Key Features

• Module type: Bifacial+dual glass
• Cell size: 182*182mm, 108 cells split into two halves 
• Module dimension: 1773*1134*30mm
• Linear performance for 30 years
• The panel will preserve 85% of the original performance 
• Warranty 12 years for the parts including frame, cells, diodes, and junction box.
• Module peak power: 425W(front side)+90W(20% increased from back side), in total 515Watt

The dual-glass modules have also better thermal conductivity compared to conventional back sheets. The thermal resistance of dual glass is slightly lower than that of ordinary modules. The smaller the thermal resistance, the better the heat conduction.