18/04/2025
Bifacial solar panels are a type of photovoltaic (PV) module that can capture sunlight from both the front and the rear sides, making them more efficient than traditional single-sided panels. Here’s a simple explanation along with a diagram.
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Technology Behind Bifacial Solar Panels
1. Structure and Design
Transparent Backsheet or Dual Glass: Unlike traditional panels that have an opaque backsheet, bifacial panels use transparent materials (like glass on both sides) to allow light to pass through or reflect back into the cells.
Solar Cells: Typically use high-efficiency monocrystalline PERC (Passivated Emitter and Rear Cell) or HJT (Heterojunction) cells which are sensitive to light on both sides.
Aluminum Frame or Frameless: Can be framed or frameless depending on the installation style.
2. How It Works
Front Side: Captures direct sunlight just like a regular panel.
Rear Side: Captures reflected sunlight from the ground or surrounding surfaces (albedo effect).
The more reflective the ground surface (e.g., white sand, snow, concrete), the more energy the rear side can absorb.
3. Energy Gain
Bifacial panels can generate up to 10–30% more energy than traditional panels depending on the installation and ground reflectivity.
4. Ideal Installation
Best installed at an angle, elevated off the ground, with a reflective surface underneath to maximize rear-side exposure.
