Bifacial solar modules and double glass bifacial solar modules are both types of solar panels designed to capture sunlight from both sides (front and back) to generate electricity.

1. Basic Bifacial Module:
   • A basic bifacial module typically consists of a front-side photovoltaic (PV) layer and a back-side PV layer, with no glass covering on either side. It captures sunlight on both the front and back surfaces.
   • The back-side PV layer is often installed slightly above the ground or on a reflective surface (such as white gravel) to maximize reflected sunlight.
   • Basic bifacial modules are typically framed and installed in the same manner as traditional monofacial modules with the front side facing the sun.
2. Double Glass Bifacial Module:
   • A double glass bifacial module is similar to a basic bifacial module but with a key difference: it has glass on both the front and back sides. This means that the entire module is enclosed in glass.
   • The front glass layer is designed to capture sunlight as it does in a traditional monofacial module, while the back glass layer allows for the reflection of sunlight onto the rear-side PV cells.
   • Double glass bifacial modules are typically frameless and can be installed with both sides exposed to sunlight.

Key differences between the two include:

• Encapsulation: Double glass bifacial modules are fully encapsulated in glass on both sides, providing better protection against environmental factors like moisture, dust, and corrosion. Basic bifacial modules usually have a non-glass back layer that may be more exposed.
• Installation: Double glass bifacial modules are typically frameless and can be installed without a traditional frame, which simplifies installation and reduces shading. Basic bifacial modules are often installed with a frame, which can create shading on the rear side.
• Durability: Double glass bifacial modules tend to be more durable due to their glass encapsulation. They can withstand harsh environmental conditions better than basic bifacial modules with exposed backsides.
• Efficiency: Double glass bifacial modules may have slightly higher front-side efficiency due to the added front glass layer, which can capture more direct sunlight. Basic bifacial modules may have a slight efficiency advantage on the rear side due to better reflection when installed above a reflective surface.

In summary, the primary difference between a bifacial module and a double glass bifacial module is the presence of glass on both sides in the latter, which provides improved durability and potential front-side efficiency advantages. The choice between the two depends on factors like installation method, environmental conditions, and desired performance characteristics.