Savings calculator
What could your roof earn you?
Instant estimate
Size, cost, subsidy & payback
Enter your average bill, usable roof area and state. Results update as you type; send them to us for a free engineer review.
MSEDCL residential slab average. About 469 units a month · 4.3 peak sun hours.
- System cost
- ₹2.4 L
- PM Surya Ghar subsidy
- − ₹78,000
- Your net cost
- ₹1.6 L
- Payback
- 2.9 yrs
- Saved in year one
- ₹54,401
- New monthly bill
- ≈ ₹150
Estimates use your state's average tariff with 3% yearly escalation, 0.5% yearly panel degradation and ₹3/unit for exported power. A site survey gives exact figures.
How we calculate
The assumptions, in plain sight
Sunshine
State-wise average peak sun hours and a 0.93 performance ratio for a clean, shade-free array.
Tariff
Your state’s average residential or commercial tariff, rising 3% a year. Exported units valued at ₹3.
Degradation
Modules lose 0.5% output a year, as per tier-1 manufacturer warranties.
Carbon
0.82 kg CO₂ avoided per unit, the CEA grid emission factor for India.
| State | Average tariff | Peak sun hours | Note |
|---|---|---|---|
| Maharashtra | ₹9.60 / unit | 4.3 | MSEDCL residential slab average |
| Karnataka | ₹8.20 / unit | 4.7 | BESCOM residential average |
| Gujarat | ₹6.60 / unit | 4.9 | DGVCL/UGVCL residential average |
| Rajasthan | ₹7.90 / unit | 5.3 | JVVNL residential average |
| Tamil Nadu | ₹6.80 / unit | 4.8 | TANGEDCO residential average |
| Telangana | ₹8.40 / unit | 4.8 | TSSPDCL residential average |
| Delhi | ₹7.20 / unit | 4.5 | BSES/TPDDL residential average |
| Uttar Pradesh | ₹7.10 / unit | 4.6 | UPPCL residential average |
| Madhya Pradesh | ₹7.80 / unit | 5 | MPEB residential average |
| Kerala | ₹7.00 / unit | 4.2 | KSEB residential average |
| Punjab | ₹7.40 / unit | 4.7 | PSPCL residential average |
| West Bengal | ₹8.10 / unit | 4.2 | WBSEDCL residential average |
Free, no-obligation
Your roof could be paying your bills by next month
Book a free site survey. An engineer measures your roof, checks shade and sends you a written proposal with the subsidy already worked in, usually within 48 hours.