A polycrystalline solar panel is manufactured from multiple silicon crystals melted together, offering a cost-effective alternative to monocrystalline technology. Polycrystalline panels account for approximately 40% of the global solar market and feature a distinctive blue color with visible crystal boundaries. These panels provide excellent value for budget-conscious installations where space is not a primary constraint.
Production and Structure
Polycrystalline panels are created by pouring molten silicon into square molds and allowing it to cool, forming multiple crystal structures. This simpler manufacturing process reduces production costs by 15-25% compared to monocrystalline equivalents. A 400-watt polycrystalline panel typically costs $80-$120 before installation. The multiple crystal boundaries create grain defects that slightly reduce electron movement efficiency.
Performance Characteristics
Polycrystalline panels offer efficiency ratings of 15-18%, approximately 3-5 percentage points lower than monocrystalline panels. They degrade at approximately 0.5% annually, slightly faster than monocrystalline technology. Temperature coefficients are around -0.4% per degree Celsius, indicating moderate heat sensitivity. Despite lower efficiency, polycrystalline panels remain popular for large residential and commercial installations where cost optimization is prioritized over space efficiency.