Solar savings calculator
Start from the one number you already know — your monthly electricity bill. Move the slider, then send a short enquiry to reveal your system size, subsidy, payback and 25-year return. Every assumption behind the maths is published below, whether you enquire or not.
Your details
Two inputs, calculated in your browser. Nothing is sent anywhere until you choose to share it.
Use the average across twelve months if your bill swings with the season.
Property type sets the tariff, the per-kW cost band and whether the central residential subsidy applies.
| Suggested system size | 5 kW |
| Shade-free roof area needed | 400 sq ft |
| Expected annual generation | 7,250 kWh |
| Central subsidy (PM Surya Ghar) | ₹78,000 |
| Indicative net investment | ₹2.0 L |
| Simple payback | 3.6 yrs |
Your estimated saving
₹4,300/month
Roughly ₹51,000 a year — and it grows every time the tariff does.
Four short steps, about ninety seconds — your bill carries over, so you will not re-enter it. This is an estimate, not a quotation: the free site survey confirms roof area, shading, structure and sanctioned load.
Rather just talk?
Our project team answers sales calls directly. Have your latest electricity bill to hand and we can size it with you on the phone.
Full transparency
Every assumption behind this calculator
Most online solar calculators hide their maths, which is how they produce flattering answers. Here is ours, in full — change any of it and the numbers change.
| Assumption | Value used | Why |
|---|---|---|
| Specific yield | 1,450 kWh per kW per year | A conservative-to-typical figure for Telangana at standard tilt with normal soiling. Well-maintained plants often exceed it; heavily shaded or unwashed ones fall below. |
| Residential tariff | Telescopic slabs: ₹5.00 first 200 units ₹7.20 to 300 ₹8.50 to 400 ₹9.00 to 800 ₹9.50 above 800 | The published TGSPDCL LT-I domestic Category C rates, which TGERC retained for FY 2026-27. We use the actual slabs rather than a flat average, and value the units solar displaces from the most expensive slab downwards — which is the order it really replaces them in. |
| Commercial tariff | ₹8.50 per unit | A deliberately conservative effective rate for LT-II. Commercial tariffs are themselves slab-based, so your real figure comes from your bill. |
| Industrial tariff | ₹7.50 per unit | Excludes maximum-demand charges, which storage can also reduce — so the industrial figure here is deliberately understated. |
| System cost | ₹55,000 / kW residential ₹45,000 / kW commercial ₹42,000 / kW industrial | Indicative turnkey rates including structure, cabling, protection, installation and net-metering support. Small systems cost more per kW; large ones less. |
| Central subsidy | ₹30,000 / kW for the first 2 kW, ₹18,000 for the third, capped at ₹78,000 | PM Surya Ghar: Muft Bijli Yojana rates for eligible residential consumers. Not available to commercial or industrial consumers. |
| Degradation | 0.5% per year | Typical linear performance-warranty slope for tier-1 modules. Applied to the 25-year saving figure. |
| Tariff escalation | 0% (not applied) | We deliberately exclude tariff inflation. Historically it has risen, so real savings are likely to be higher than shown — we would rather understate. |
| Roof area | 80 sq ft per kW | A working figure for a tilted rooftop array including access walkways and inter-row spacing. |
| CO₂ factor | 0.71 kg per kWh | Approximate grid emission factor for the Indian grid. The trees-equivalent figure uses 21.77 kg of CO₂ absorbed per tree per year. |
| Self-consumption | Full net metering | Assumes every exported unit offsets an imported one. Where export is capped or settled at a lower rate, savings reduce. |
| System sizing | About 90% of your consumption | We do not size to wipe the bill out entirely. DISCOMs restrict sanctioned capacity, oversizing earns nothing without banking, and no roof performs perfectly every month. Fixed charges and electricity duty remain payable regardless. |
Subsidy
How the PM Surya Ghar subsidy actually works
The central residential rooftop subsidy is generous, but it is also frequently misquoted. Here is the mechanism.
- It is a fixed amount per kW, not a percentage of your quote. ₹30,000 per kW for the first 2 kW and ₹18,000 for the third — so ₹60,000 at 2 kW and ₹78,000 at 3 kW or above.
- ₹78,000 is the cap. A 10 kW home system receives the same ₹78,000 as a 3 kW one.
- It reaches you, not us. The amount is credited to your bank account after commissioning and inspection. You pay the full project cost and receive the subsidy back.
- Residential only. Commercial and industrial consumers are not eligible — though they can usually claim accelerated depreciation, which is often worth more.
- Housing societies have a separate rate for common-area capacity, with its own cap.
- Registration is on the National Portal, with a mapped registered vendor. We handle the registration, vendor mapping and inspection follow-up for you.
Worked example: 5 kW home system
| System size | 5 kW |
| Indicative project cost | ₹2,75,000 |
| Central subsidy (capped) | – ₹78,000 |
| Net cost to you | ₹1,97,000 |
| Annual generation | ~7,250 kWh |
| Annual saving at ₹8.50 | ~₹61,600 |
| Simple payback | ~3.2 years |
| Saving over 25 years | ~₹14.5 L |
Illustrative, using the assumptions published above. Your figures will differ.
From estimate to proposal
The survey is free and takes about forty minutes
We measure the roof, log the shading, read your bills and hand you a written estimate of generation, cost, subsidy and payback — yours to keep whether or not you go ahead with us.