Free Solar Panel Calculator

Plan your switch to renewable energy with this advanced Solar Panel Calculator, which accurately sizes your system based on your monthly electricity usage and available roof space. It features smart "Configuration Logic" to optimize panel wiring for safety and automatically checks if your area is sufficient for the installation. Get an instant breakdown of your estimated project costs, annual financial savings, payback period, and environmental impact today.

Solar Project Estimator

Technical Sizing, Wiring Check & ROI Analysis

Enter Data

Monthly Usage (kWh) ? Check your electricity bill for "Units Consumed" (kWh). Use the highest usage month (summer) for a safe estimate.

Avg Peak Sun Hours ? Hours of full-intensity sunlight per day. Google "[Your City] Peak Sun Hours". Avg is 4-5 hours.

Electricity Rate (₹/kWh) ? Found on your bill. Divide "Total Bill Amount" by "Total Units" to get the effective rate per unit.

System Loss Factor ? Accounts for energy lost to heat, dust, and wiring. 1.3 (30% loss) is the industry standard safety margin.

Panel Wattage (W) ? Found on the panel datasheet. Common residential sizes are 400W to 550W.

Panel Efficiency (%) ? Found on the panel datasheet. Modern Mono-PERC panels are usually 20% to 22% efficient.

Panel Voc (Volts) ? Open Circuit Voltage. Found on the back sticker or the datasheet of the solar panel (usually 45V-50V).

Available Area (m²) ? Measure your shadow-free roof space (Length × Width). Using Google Earth is the easist way to find the appox. area of a space.

Est. Install Cost (₹ per kW) ? "Install Cost" represents the Price per Kilowatt (₹/kW).It is a standard industry method for quoting solar projects. Instead of listing the price of every screw and wire, installers give a "Turnkey Price" based on the size of the system.The Ministry of New and Renewable Energy releases "Benchmark Costs" every year. This is the maximum price installers are supposed to charge to be eligible for subsidies.Where to find: google "The National Portal for Rooftop Solar".

📊 Project Analysis

System Requirements

Daily Load ?Your calculated average electricity consumption per day based on monthly usage. 0 kWh

System Size Needed ?The recommended total capacity (kW) of solar panels required to meet your daily energy needs. 0 kW

Inverter Capacity ?The recommended size of the inverter to handle the peak power output of your solar panels. 0 kW

Configuration

Panels (Math) ?The theoretical number of panels needed based strictly on energy consumption math. 0

Final Panel Count ?Actual number of panels to be installed. Adjusted to ensure safe wiring or balanced strings. 0

String Voltage ?Estimated total DC voltage. Used to determine if panels need to be split into parallel strings for safety. 0 V

Roof Feasibility

Area per Panel (+15% gap) ?Physical space required for one panel, including a 15% margin for mounting clamps and maintenance access. 0 m²

Total Area Req. ?Total roof space needed to install the Final Panel Count. 0 m²

Max Panels Fit ?The maximum number of panels that can physically fit in your specified Available Area. 0

ROI

Project Cost ?Estimated upfront cost based on the 'Install Cost per kW' and the System Size. ₹0

Annual Savings ?Estimated money saved per year by generating your own electricity instead of buying from the grid. ₹0

Payback Period ?Time taken for savings to cover the initial cost (Total Cost ÷ Annual Savings). 0 Years

CO₂ Offset ?Estimated reduction in carbon emissions compared to using coal-based grid electricity. 0 Tons