Free online Solar Panel Calculator. Calculate solar PV system size (kW), required panels count, and roof area needed for home installation.
⚡ Interactive Calculation Engine Active
Please enable JavaScript in your browser to run live computations, 2D envelope diagrams, and export PDF reports.
How to Use Solar Panel Calculator
Choose to input monthly unit consumption (kWh) or average bill amount.
Configure local peak sun hours and target solar panel wattage.
Adjust system efficiency losses based on your roof tilt and shade.
Review system kW capacity, panel count, and roof space details.
Planning a Roof Solar Installation
When installing solar panels, ensure the roof has shadow-free space facing South (in the northern hemisphere) to maximize sun absorption. A standard 1kW rooftop solar system requires approximately 80 to 100 square feet of area.
Frequently Asked Questions
What are average peak sun hours?
Peak sun hours represent the average daily solar irradiance equivalent to 1000W/m² of sun intensity. In India, peak sun hours typically range from 4.0 to 5.5 hours per day.