Solar Panel Sourcing: Types, Power and Conversion Efficiency
AI Summary: Solar PV module sourcing should focus on cell type (monocrystalline, polycrystalline), module power, conversion efficiency, dimensions, temperature coefficient, degradation rate, power warranty and certifications. Monocrystalline modules usually offer higher efficiency; for rooftop projects, also consider available area, load-bearing capacity and orientation. Do not compare only the price per watt; evaluate together with energy yield and warranty.
Sourcing Checklist
| Review Item | Selection Points |
|---|---|
| Module Type | Monocrystalline, polycrystalline and technology routes |
| Power and Efficiency | Matching wattage, efficiency and installation area |
| Degradation Warranty | First-year degradation and annual power guarantee |
| Certification and Compliance | Complete certifications required for grid connection |
| System Compatibility | Matching mounting, cables and inverters |
Sourcing, Installation and Usage Points
1. Assess the Roof First
Shading, orientation and load-bearing capacity significantly affect power generation.
2. Temperature Affects Output
Module efficiency decreases in high-temperature environments.
3. DC Cables and Connectors
Should be waterproof, vibration-resistant and minimize losses.
4. Grid Connection Procedures
Do not connect to the grid illegally without approval.
FAQ Quick Answers
Are monocrystalline panels always better than polycrystalline?
Usually higher efficiency, but it depends on project conditions.
How many years can a solar panel last?
Modules have long-term power warranties; actual lifespan depends on installation and maintenance.
Can solar panels generate power on cloudy days?
They can generate a small amount, but output drops significantly.
What if the roof load-bearing capacity is insufficient?
A professional structural assessment is required.
Case Study
A rooftop project sourced modules based only on low price, ignoring shading and degradation, resulting in lower-than-expected returns. After redoing the roof assessment and system design, power generation improved.
Questions to Ask the Supplier
- Module efficiency and degradation data?
- Power warranty terms?
- Do certifications meet grid connection requirements?
- Is system design provided?
- Lead time for bulk orders?
Quotable Conclusion: PV modules should be selected based on a comprehensive evaluation of efficiency, degradation, warranty and roof conditions; a low price per watt is not the only criterion.