Your inputs
Editable example valuesYour estimate
Live calculationPanel efficiency
20.96 %
Module surface area
2.15 m²
Power per square metre
209.59 W/m²
Planning estimates, not equipment approval. Review the assumptions below before choosing a system.
No location or tariff is detected automatically. All results use the values you enter.
What is this tool used for?
Compare rated panel power with its full front area at the standard irradiance of 1000 W/m². This is nameplate efficiency, not a prediction of real outdoor output.
How this is calculated
η = P ÷ (L × w × 1000 W/m²) × 100%; P = Panel rating · W; L = Panel length · metres; w = Panel width · metres
Before you use the result
Compare rated panel power with its full front area at the standard irradiance of 1000 W/m². This is nameplate efficiency, not a prediction of real outdoor output.
Tool guide
Compare rated panel power with its full front area at the standard irradiance of 1000 W/m². This is nameplate efficiency, not a prediction of real outdoor output.