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Qalc AI
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Solar Panel Wattage
All ecology tools
Calculate module power output based on size and efficiency.
Dimensions & Tech
Length (mm)
Width (mm)
Module Efficiency (%)
Power Output
Power Output
420
W
Total Area
1.95
m²
Power Density
215
W/m²
Technology Comparison
About this calculator
Quick Reference
STC Irradiance
1000 W/m²
STC Temp
25°C
Overview
Solar panel wattage is determined by its area and efficiency. Standard test conditions (STC) assume 1000 W/m² irradiance.
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Pro Tips
Higher efficiency panels are better for limited roof space.
Temperature affects voltage; hotter panels produce less power.
Standard sizes help with racking compatibility.
!
Fun Facts
"Modern commercial panels range from 400W to over 600W."
"Efficiency records in labs exceed 47%, but commercial panels are around 20-23%."
"Bifacial panels can generate power from the back side as well."
