How to use it
- Enter average daily energy use in kWh.
- Enter representative peak sun hours and panel wattage.
- Enter an estimated system efficiency and calculate.
Solar Panel Calculator
Estimate a theoretical array size and panel count from daily energy use.
Important: This calculator is for educational and estimation purposes only. It is not electrical safety, installation, engineering, or code-compliance advice. Always consult a qualified electrician or engineer for real-world electrical work.
About the Solar Panel Calculator
This high-level estimator compares daily energy demand with peak sun hours, panel wattage and an assumed overall efficiency.
How it works
Required array kW equals daily kWh ÷ (peak sun hours × efficiency). Panel count divides that array wattage by panel wattage and rounds up.
Example
For 30 kWh per day, 5 peak sun hours and 80% efficiency, the estimate is 7.5 kW. With 400 W panels, that rounds up to 19 panels.
Notes
This is not a solar installation, structural, electrical, financial or code-compliance design. Weather, shading, orientation, inverter limits, losses and local rules require professional assessment.