Solar Panel Payback Period Calculator 2026: Calculate ROI & Electricity Savings
Cumulative Solar Savings Timeline (25 Years)
| TIMELINE | POWER GENERATED (kWh) | ANNUAL SAVINGS (₹) | CUMULATIVE SAVINGS (₹) | NET PROFIT / ROI (₹) |
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How Solar Payback Period (ROI) is Calculated
The solar panel payback period is the time required for the electricity savings from your rooftop solar system to equal the initial net capital cost of installation. After reaching the payback milestone, all electricity produced by your solar system is essentially 100% free profit.
Annual Bill Savings = (System Capacity in kW x 120 Units/Month x 12) x Electricity Rate/Unit
Payback Period (Years) = Net System Cost / Annual Bill Savings
4 Major Benefits of Installing Rooftop Solar in 2026
- Drastic Power Bill Reduction: A properly sized rooftop solar system can reduce your monthly DISCOM electricity bill by 80% to 90%.
- PM Surya Ghar Muft Bijli Yojana Subsidy: The Indian government offers direct financial assistance up to ₹78,000 for 3 kW rooftop solar systems.
- 25-Year Warranted Performance: Tier-1 solar panels come with a 25-year performance warranty, generating clean energy long after your 3 to 4-year payback period.
- Protection Against Utility Rate Hikes: Grid electricity rates increase by 3% to 5% annually. Solar locks in your energy cost at zero marginal cost.
Frequently Asked Questions (FAQs)
What is the PM Surya Ghar solar subsidy scheme in India?
PM Surya Ghar Muft Bijli Yojana provides a central financial subsidy of ₹30,000 for 1 kW systems, ₹60,000 for 2 kW systems, and ₹78,000 for 3 kW or higher residential rooftop installations.
How many electricity units does a 3 kW solar system produce daily?
A 3 kW solar power system generates an average of 12 to 14 units (kWh) of electricity per day under standard sunlight conditions in India (~4,300 units annually).
What happens on cloudy days or during monsoon?
On overcast or rainy days, solar panel generation drops by 40% to 70%. Under Net Metering, your grid connection automatically supplies power when solar generation is low.
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