Solar Panel Calculator
Calculate solar panel system size and cost for your home. Estimate savings, payback period, and government subsidy eligibility in India.
What is Solar Panel Calculator?
This solar panel calculator determines the optimal system size (kW) for your home based on monthly electricity consumption, roof area, and sunlight hours. Shows installation cost, government subsidy under PM Surya Ghar, monthly savings, and payback period.
How to Use This Calculator
- Enter your project measurements such as area, dimensions, or material specifications
- Select material quality grade or regional cost factors if available
- View the estimated material quantities, costs, or measurements instantly
- Review waste factor assumptions and adjust for your specific site conditions
How Solar Panel Calculator is Calculated
This calculator uses standard construction estimation methods based on IS codes and industry practices in India. The solar panel estimation includes typical wastage factors and standard material ratios. Actual requirements may vary based on site conditions, material quality, and construction methods.
Frequently Asked Questions
What size solar system do I need for my home?
Divide monthly units consumed by 120 (avg units per kW per month in India). For 300 units/month: 300/120 = 2.5 kW system. Round up to 3 kW. Requires ~180 sqft shadow-free roof area (60 sqft per kW for modern panels).
What is the PM Surya Ghar subsidy?
Central subsidy (2025): ₹30,000/kW for first 2 kW, ₹18,000/kW for 2–3 kW capacity. Maximum ₹78,000 for 3 kW. A 3 kW system costing ₹1.8–2L gets ₹78K subsidy, reducing cost to ~₹1.1–1.2L. Apply through the national portal.
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Construction disclaimer: Material estimates are approximate. Actual quantities depend on site conditions, wastage, and construction methods. Consult a qualified contractor or engineer before purchasing materials. See our full Disclaimer.
Author: Calc Labz Editorial Team | Reviewed for accuracy
Last updated: April 2026