How much can you save with solar?
Free solar savings calculator for homes and businesses in India. Enter your monthly electricity bill and get the system size, cost after subsidy, payback period, ROI, IRR, EMI and 25-year savings, with the government subsidy applied for homes. The estimate appears on screen; a name and mobile number are only needed for the year-by-year report and PDF.
Calculate your solar savings
Loan Repayment Schedule
| Yr | Opening | EMI Paid | Principal | Interest | Balance |
|---|
Get your full detailed report
Unlock your complete year-by-year savings breakdown and a downloadable PDF report. Our solar expert may call to help you go solar.
| Yr | Bill w/o Solar | EMI | Saved | Net | Cumulative |
|---|
What the calculator assumes, and where you can change it
These are planning defaults, not a quotation. Every one can be edited under Advanced Assumptions, so replace them with the figures from your own bill and quote.
| Input | Default | Note |
|---|---|---|
| Monthly bill | ₹3,500 | Use the average of your last 2 to 3 bills. |
| Current tariff | ₹8 per unit | Check your own bill, rates vary by DISCOM. |
| Tariff inflation | 5% a year | Historical Gujarat average is roughly 3 to 6% a year. |
| System cost | ₹50,000 per kWp | Charged on the installed DC array, the way rooftop quotes are written. A custom price can be entered. |
| Generation | 4.5 units per kW per day | Gujarat average is roughly 4.3 to 4.8. |
| Export tariff | ₹2.25 per unit | Net-metering rate for surplus units. |
| Panel degradation | 0.5% a year | Output falls slightly each year. |
| Annual O&M cost | ₹0 | Enter your own figure if you pay for maintenance. |
| Discount rate for NPV | 7% | Used for the net present value only. |
| PM Surya Ghar subsidy | Yes (residential) | Choose "No / Commercial" for shops, offices and factories. |
How to Read Your Results
Every figure in your solar estimate has a specific meaning. Here is a plain-English guide to each metric.
The capacity of the solar array needed to offset your monthly consumption. 1 kW of solar generates roughly 90–120 units/month in India depending on your city.
How much your electricity bill is expected to reduce after going solar. This factors in your current per-unit tariff and local peak sun hours.
The total installed cost of panels, inverter, mounting structure, wiring, and installation at current market rates.
The central government subsidy for residential rooftop solar: ₹30,000/kW for the first 2 kW, ₹18,000/kW for the 3rd kW, capped at ₹78,000.
Your actual out-of-pocket cost after the government subsidy is deducted. This is the figure to compare with your cumulative electricity bill savings.
The number of years it takes for your cumulative electricity savings to equal your net investment. After this point, every rupee saved is pure return.
The total electricity cost you avoid over the standard 25-year panel life. This accounts for annual electricity tariff escalation of ~5%.
The carbon dioxide emissions your system avoids by displacing coal-based grid electricity. Every kWh of solar saves approximately 0.82 kg of CO₂ in India.
Next Steps
Your calculator estimate is the starting point. Here is how Heaven Green Energy takes you from numbers on a screen to solar panels on your roof.
Share Your Results
Screenshot or note the recommended system size, estimated savings, and payback period from your calculation above.
Book a Free Site Assessment
Our engineer visits your home or business to verify rooftop suitability, check electrical load, and finalise the system design.
Receive Your Custom Proposal
You get a detailed, itemised quote, panel brand, inverter, cost, subsidy deduction, expected savings, ROI, and payback period.
Go Solar
Approve the proposal and we handle everything: procurement, installation, DISCOM approvals, net metering, and subsidy filing.
The site assessment is 100% free
Our engineer visits your site, reviews your rooftop, checks your electrical panel, and prepares a detailed proposal, all at no charge. You are under no obligation to proceed.
Book Free Assessment How accurate is the solar savings calculator?
What is "peak sun hours" and why does my city matter?
The calculator shows a large system size. Can I install a smaller system?
Does the calculator include the PM Surya Ghar subsidy?
How is the payback period calculated?
What does the calculator assume by default?
Can I use the calculator for a shop, office or factory?
Do I have to give my phone number to see the estimate?
Next step by property type, city numbers and guides
Next step
- Home solar subsidy, process and FAQs
- Commercial solar offices, shops, hospitals
- Industrial solar factories and plants
- Ground-mount solar park
City guides
Seen Your Savings? Let's Make Them Real.
Book a free site assessment. Our engineers will finalise your system design and handle every step from approval to installation.