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 units aap ghar mein use nahi karte, woh grid ko bhejte hain. DISCOM unhe aapke account mein credit karta hai same rate pe. Iska matlab:
- Din mein office/school mein sab log bahar — solar generate karta raha, units credit hote rahe
- Raat ko wahi credits use karo
- Effective mein 24/7 solar ka benefit
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