Efficiency and wattage are different
Module efficiency describes how much sunlight a panel converts relative to its surface area. Wattage describes rated power under test conditions. A higher-wattage panel may be useful, but the result still depends on available roof area and the system design.
Temperature and degradation affect the real world
Panel output changes with temperature, and manufacturers publish temperature coefficients to describe that behaviour. Performance also changes gradually over time, so warranty and degradation information matter when comparing products.
The inverter and roof are part of the result
Inverter efficiency, cable losses, shading, orientation, ventilation and roof layout influence how much electricity a system delivers. A panel with strong headline efficiency may be a poor practical fit if roof constraints dominate the design.
Compare the complete system
Solar Picks helps explore panel and inverter specifications. Solar System Builder helps put equipment choices into a configuration context. Use both as discovery tools, then have the final design checked against the property and professional requirements.
- Compare efficiency and wattage together
- Consider roof area and shading
- Review inverter and warranty information
- Focus on system fit rather than one headline number
See the platform in action.
Explore these SOLARGAGA experiences to understand the workflow described above.