A solar panel is not just a simple board, but a sophisticated photovoltaic device composed of multiple layers of materials and components. Each part plays a unique role, converting sunlight into electricity while ensuring long-term outdoor durability.
The key components of a standard solar panel, from top to bottom, include: tempered glass, EVA film, solar cells, EVA film, backsheet, aluminum frame, and junction box.
The top layer is low-iron tempered glass, featuring high light transmittance, impact resistance and weatherability. It protects internal components from hail, rain and dust, while maximizing sunlight absorption.
The core power-generating part is
solar cells, usually monocrystalline or polycrystalline silicon. Through the photovoltaic effect, they convert light energy directly into electrical energy.
Upper and lower layers of
EVA film encapsulate and fix the cells, providing insulation, sealing and stress relief.
The backsheet at the bottom offers waterproofing, UV resistance and electrical insulation, further protecting the internal circuit.
An aluminum alloy frame reinforces structural strength, facilitates installation and fixes the panel securely. The junction box at the rear collects electric current, connects to external circuits and provides anti-reverse diode protection.
Every layer and component is designed for reliability and efficiency. The rational composition of solar panels lays a solid foundation for residential, commercial and utility-scale photovoltaic systems, making clean solar energy widely applicable.
