The most important financial question about solar: how long until it pays for itself? Let's calculate the real ROI with actual numbers.
Typical investment breakdown (5 kW residential system):
- Total system cost: Rs 3,15,000
- Government subsidy: Rs 78,000
- Your net investment: Rs 2,37,000
Monthly savings calculation:
- Average generation: 600 units/month
- Average tariff saved: Rs 7.5/unit
- Monthly savings: Rs 4,500
- Annual savings: Rs 54,000
Payback period: Rs 2,37,000 / Rs 54,000 = 4.4 years
But it gets even better:
- Electricity tariffs increase 5-8% annually
- Your savings grow every year as grid rates rise
- In year 5, you might save Rs 6,000/month instead of Rs 4,500
25-year total value:
- Total electricity generated: ~1,70,000 units
- Total savings (with tariff inflation): Rs 18-22 lakhs
- Return on Rs 2.37 lakh investment: 8-9x
Factors that improve ROI:
- Higher electricity consumption (bigger bills = bigger savings)
- South-facing roof with minimal shading
- Regular panel cleaning and maintenance
- Using high-efficiency panels with better warranty
Factors that reduce ROI:
- Significant shading on panels
- Low electricity consumption
- Poor quality installation or components
- Neglecting maintenance
SolarWale provides a personalized ROI calculation during the free roof audit, based on your actual bill, roof conditions, and local tariff structure.