Solar Panel ROI Samajhna Kyun Zaroori Hai?
Solar install karne se pehle sabse common sawaal yahi hota hai — "kitne saal mein paisa wapas aayega?" Yeh guide Rajasthan ke actual electricity rates aur solar production data ke basis pe hai.
Rajasthan mein Solar Production
Rajasthan India ka sabse zyada solar radiation wala state hai. Average Global Horizontal Irradiance (GHI):
- Jaipur: 5.8 kWh/m²/day
- Jodhpur: 6.2 kWh/m²/day
- Bikaner: 6.4 kWh/m²/day
- Udaipur: 5.6 kWh/m²/day
Practical thumb rule: 1 kW solar system Rajasthan mein average 4–4.5 units/day generate karta hai (annual average, including cloudy days aur dust losses).
ROI Calculation — Example
Assumption: 3 kW rooftop solar system, Jaipur
| Parameter | Value |
|---|---|
| System cost | ₹1,80,000 |
| PM Surya Ghar subsidy | ₹78,000 |
| Net cost | ₹1,02,000 |
| Monthly generation | ~390 units |
| JVVNL tariff (domestic) | ₹6.50/unit |
| Monthly savings | ₹2,535 |
| Annual savings | ₹30,420 |
| Payback period | 3.4 years |
Electricity Rate Slabs — JVVNL 2024-25
- 0–50 units: ₹3.85/unit
- 51–150 units: ₹5.50/unit
- 151–300 units: ₹6.50/unit
- 300+ units: ₹7.00/unit
Agar aapka bill consistently 300+ units ka hai toh ROI aur bhi better hoga.
Net Metering ka Impact
Net metering se jo solar electricity aap ghar mein use nahi karte, woh grid mein export ho jaati hai. DISCOM applicable net-metering rules ke according exported electricity ka adjustment/credit karta hai. Iska matlab:
- Din mein jab ghar mein consumption kam hota hai, solar electricity grid mein export ho sakti hai.
- Exported electricity ka applicable credit/adjustment aapke electricity bill mein reflect hota hai.
- Raat ya jab solar generation kam hoti hai, aap grid se electricity use kar sakte hain.
- Isse solar system ka overall electricity bill kam karne mein help milti hai.
25 Saal ka Total Savings Estimate
3 kW system, Jaipur:
- Year 1–5 savings: ~₹1.5 lakh
- Year 6–25 savings (tariff 5% annual increase assume): ~₹8–10 lakh
- Total 25-year savings: ₹9–11 lakh
- Net investment (post-subsidy): ₹1.02 lakh
Return on Investment: 900–1000% over system lifetime.
Apna ROI Kaise Calculate Karein?
- Last 3 months ka bijli bill average nikalo
- Monthly units = bill ÷ average rate
- System size = monthly units ÷ 120 (Rajasthan average monthly production per kW)
- Hume call karo — free site assessment mein exact calculation denge: 8209844146