What is Solar Panel?
The Solar Panel Calculator estimates how much you can save by going solar. With Indian government subsidies of up to ₹78,000 for residential rooftop solar (under PM Surya Ghar Muft Bijli Yojana), the effective cost has dropped significantly, making solar a compelling investment with 4-6 year payback periods.
A typical Indian household consuming 300 units/month needs a 3 kW system, which costs ₹1.35-1.80 Lakhs after subsidy. This system generates approximately 4,200 units/year, saving ₹25,000-35,000 annually. Solar panels last 25+ years with minimal maintenance.
India receives 300+ days of sunshine per year, making it one of the best countries for solar energy. With net metering, excess electricity generated during the day is exported to the grid, earning you credits on your bill.
Formula
System Size = Monthly consumption (kWh) / 120 (avg generation per kW/month in India) Or limited by roof: 1 kW per 100 sq ft of shadow-free roof
Annual Generation = System kW × 1,400 kWh (Indian average) Annual Savings = Annual Generation × ₹8/unit (average rate) Payback Period = Installation Cost / Annual Savings
Example — ₹3,000 monthly bill: Monthly consumption: ~375 kWh System size: 3 kW Annual generation: 4,200 kWh Annual savings: ₹33,600 Cost (after subsidy): ₹1,35,000 Payback: 4.0 years
How to use this Solar Panel Calculator?
1. Enter your monthly electricity bill in ₹. 2. Enter available shadow-free roof area in sq ft. 3. Enter cost per kW after government subsidy (₹40,000-50,000 is typical after subsidy). 4. See recommended system size, annual savings, installation cost, and payback period.