Residential Solar Panel (400W)

Material Composition Assumptions

A typical 400W monocrystalline solar panel weighs approximately 18 kilograms and consists of several key material components. The monocrystalline silicon wafers form the primary semiconductor material, representing about 15% of total weight but the most carbon-intensive component. Tempered glass comprises the largest material fraction at roughly 70% of panel weight, providing weather protection and structural integrity. The aluminum alloy frame contributes approximately 20% of weight while enabling mounting and edge protection.

Additional materials include polyethylene terephthalate backing sheets, ethylene vinyl acetate encapsulant layers that protect the silicon cells, and copper wiring with junction box components for electrical connections. Solder materials and various connector assemblies complete the module construction, though these represent less than 5% of total panel weight.

Manufacturing Geography

China dominates global solar panel manufacturing, producing approximately 80% of worldwide photovoltaic modules. The country’s manufacturing concentration stems from integrated supply chains, government policy support, and established polysilicon refining infrastructure. Chinese electricity generation relies heavily on coal-fired power plants, resulting in a national grid intensity of approximately 577 grams of carbon dioxide per kilowatt-hour.

This carbon-intensive electricity mix significantly impacts the embodied emissions of Chinese-manufactured panels, particularly during energy-intensive polysilicon purification and wafer production processes. Manufacturing facilities consume substantial electricity for high-temperature furnaces and clean room environments required for semiconductor-grade silicon processing.

Regional Variation

Manufacturing Region	Grid Intensity	Estimated CCI Score	Adjustment vs Default
China	577 gCO2/kWh	41 kg CO2e	Baseline
European Union	253 gCO2/kWh	29 kg CO2e	-29%
United States	386 gCO2/kWh	35 kg CO2e	-15%
South Korea	436 gCO2/kWh	37 kg CO2e	-10%
Malaysia	445 gCO2/kWh	38 kg CO2e	-7%

Provenance Override Guidance

1. Manufacturing facility location with specific grid electricity carbon intensity data or renewable energy procurement agreements
2. Polysilicon supplier information including production location and purification process energy sources
3. Transportation logistics documentation showing shipping distances, modes, and routing from manufacturing to installation site
4. Module efficiency ratings and power output specifications that affect per-kilowatt-hour emission calculations
5. Supply chain transparency data covering aluminum frame, glass, and encapsulant material sourcing with associated emission factors

Methodology Notes

• The CCI score represents cradle-to-gate emissions per 400W solar panel module, excluding installation infrastructure and end-of-life disposal
• Scope 3 emissions dominate the profile due to upstream material extraction, polysilicon refining, and manufacturing processes occurring in supplier facilities
• Functional unit basis reflects emissions per installed panel capacity rather than per kilogram of material
• Transportation assumptions include typical international shipping distances from Asian manufacturing hubs to North American markets
• Energy payback calculations exclude mounting hardware, inverters, and balance-of-system components that vary significantly across installations
• Regional grid intensity variations create substantial differences in manufacturing emissions, particularly for energy-intensive polysilicon processing
• Data gaps exist for emerging thin-film technologies and next-generation cell architectures that may alter emission profiles