At the government benchmark prices behind the PM Surya Ghar subsidy, a 3 kW rooftop solar system works out to roughly Rs 1.45 lakh before subsidy and about Rs 67,000 after the Rs 78,000 central subsidy. Real market quotes vary with brand, roof type and location, and many households pay more than the benchmark.
This guide shows what drives the price, how to read a quote and how long a system typically takes to pay for itself.
Key Takeaways
- Cost scales with system size. Working back from official subsidy figures, benchmark costs are about Rs 50,000 for 1 kW, Rs 1 lakh for 2 kW and Rs 1.45 lakh for 3 kW.
- The central subsidy can cover more than half of the benchmark cost for a 3 kW home system.
- Panel type, inverter quality, mounting structure, roof type and installer all change the final price.
- Payback commonly falls within a few years, depending on your tariff, usage and the quote you accept.
- Compare at least three written quotes with the same specifications before you decide.
How Much Does a Rooftop Solar System Cost in India?
The central subsidy figures published on the India.gov.in PM Surya Ghar page are set at benchmark prices. Working backwards from them gives these approximate benchmark costs. They are our estimate, not a price list, and real quotes will differ.
| System size | Benchmark cost (approx.) | Central subsidy | Cost after subsidy (approx.) |
|---|---|---|---|
| 1 kW | Rs 50,000 | Rs 30,000 | Rs 20,000 |
| 2 kW | Rs 1,00,000 | Rs 60,000 | Rs 40,000 |
| 3 kW | Rs 1,45,000 | Rs 78,000 | Rs 67,000 |
Subsidy applies to eligible residential households. Businesses and factories do not receive this subsidy, and their costs depend on system size, equipment and site conditions.
What Affects the Cost of Solar Panels?
- System capacity: a larger system costs more in total, but usually less per kW.
- Panel type and brand: monocrystalline panels cost more than polycrystalline but produce more power per square metre.
- Inverter quality: a reliable inverter with good monitoring is worth paying for, since it is the part most likely to need replacement.
- Mounting structure and roof type: flat concrete roofs, sloped sheets and elevated structures all need different designs and materials.
- Cables, protection and earthing: good quality here improves safety and system life.
- Net meter and DISCOM charges: some states have fees for meters and inspection.
- Location and installer: logistics, labour and the installer's service and warranty support all affect the quote.
What Should a Solar Quote Include?
A clear quote lists more than a price per kW. Check that it covers:
- Panel brand, model, wattage and number of panels
- Inverter brand, capacity and warranty
- Mounting structure material and wind rating
- Cables, switches, surge protection and earthing
- Net meter application, inspection and commissioning support
- Warranty terms for panels, inverter and workmanship
- Payment schedule and after-sales service
How Long Does Solar Take to Pay for Itself? A Worked Example
This is an illustration with assumed numbers. Your results will differ.
- System: 3 kW rooftop system in a sunny part of India.
- Generation: about 4 to 5 units (kWh) per kW per day, so roughly 12 to 15 units per day, or 360 to 450 units per month.
- Assumed tariff: Rs 7 per unit, giving savings of about Rs 2,500 to Rs 3,150 per month.
- Assumed quote: Rs 1.8 lakh before subsidy, which is Rs 1.02 lakh after the Rs 78,000 subsidy.
- Simple payback: about 3 to 3.5 years.
In reality, fixed charges on your bill do not disappear, and savings depend on how much solar power you use directly and how your state settles exported units. Our net metering guide explains the settlement. After payback, the system keeps generating for 25 years or more, as covered in how solar panels work.
How Can You Avoid Overpaying for Solar?
- Get at least three written quotes with the same panel, inverter and structure specifications.
- Be cautious of quotes far below the benchmark. Low prices may mean weaker equipment or missing items.
- Check that equipment meets the scheme norms if you want the subsidy. Your vendor can confirm this.
- Ask about warranty, who handles service and how fast they respond.
- Read the PM Surya Ghar subsidy guide so you apply in the right order.
How Does the Cost per kW Change With System Size?
Larger systems usually cost less per kW because fixed costs, such as design, transport, approvals and installation visits, are spread over more panels. The official benchmark figures also show this: the first kW is higher, and additional kW come at a lower step cost. That is why a 3 kW system costs less than three times a 1 kW system.
What Hidden or Extra Costs Should You Ask About?
- Structure height: raised structures for shade-free or double-use roofs cost more than low flat mounting.
- Extra cable length: if your inverter is far from the panels or the meter, cabling costs rise.
- DISCOM charges: some states charge for meters, inspection or feasibility checks.
- Roof repair or waterproofing: drilling or loading an old roof may need extra work.
- Monitoring and Wi-Fi modules: some quotes treat these as add-ons.
- Taxes: confirm whether the quote is inclusive of applicable taxes.
What Does a Solar System Cost Over Its Lifetime?
The purchase price is not the only cost. Plan for these as well:
| Item | Typical timing | Notes |
|---|---|---|
| Panel cleaning | Every few weeks | Low cost if done at home with water and a soft cloth |
| Annual inspection | Once a year | Check wiring, earthing, mounting and inverter |
| Inverter replacement | Often after 10 to 15 years | Usually the main mid-life expense |
| Battery replacement (hybrid or off-grid) | Depends on battery type and use | Can be a significant cost |
Illustrative Quote Comparison
The table below is a made-up illustration of why the cheapest quote is not always the best. The numbers are only examples.
| Item | Quote A | Quote B | Quote C |
|---|---|---|---|
| Price for 3 kW | Lowest | Middle | Highest |
| Panel and inverter brands | Not named | Named, with datasheets | Named, with datasheets |
| Structure | Light-gauge, not specified | Specified, wind-rated | Specified, wind-rated |
| Net meter and subsidy support | Not included | Included | Included |
| After-sales service | Not stated | Stated | Stated with response time |
Quote A may look attractive, but its missing details could cost you more later. Ask each vendor to fill in the same checklist.
How Can You Finance Rooftop Solar?
- Savings: simplest, with no interest cost.
- Bank or financial institution loans: spread the cost over several years. Compare interest rate, tenure and charges.
- Subsidy as part of the plan: remember that the subsidy is credited after commissioning, so you may need to fund the full amount first. See our PM Surya Ghar Yojana guide for the process.
What About Solar Costs for Businesses and Factories?
The central residential subsidy does not apply to commercial and industrial buildings, so their cost depends on system size, equipment and site conditions. These users often benefit from large daytime consumption, which matches solar generation well. Ask your installer and tax advisor about any other benefits that may apply to your business.
Final Thoughts
Rooftop solar in India has become far more affordable, especially for homes that qualify for the central subsidy. The best price is not the lowest one, but the quote with the right equipment, clear warranty and reliable service.
Want a number for your own roof? Contact a certified solar installer for a free site assessment and a detailed, subsidy-ready quote.
Frequently Asked Questions
How much does a 3 kW solar system cost in India?
Working back from official subsidy figures, the benchmark cost of a 3 kW system is roughly Rs 1.45 lakh before subsidy. Actual quotes vary by brand, roof and state, and many are higher than the benchmark.
How much is the subsidy for a 3 kW solar system?
Eligible households get a central subsidy of up to Rs 78,000 for a 3 kW system under the PM Surya Ghar Muft Bijli Yojana, at current benchmark prices.
What is the cost of solar panels per kW in India?
At benchmark prices the first kW works out to about Rs 50,000. Market prices differ with panel type, inverter, structure and installer, so compare written quotes.
How many units does a 1 kW solar system generate?
In a sunny part of India, a 1 kW rooftop system often generates around 4 to 5 units (kWh) per day. Your installer can give a site-specific estimate.
What is the payback period for rooftop solar?
Payback depends on your tariff, usage, system price and subsidy. Many households recover the cost within a few years, and the system keeps producing for 25 years or more.
Why do solar quotes differ so much?
Quotes differ because of panel and inverter brands, structure design, roof type, warranty terms and the installer's service. Always compare like-for-like specifications.
How much roof space does a solar system need?
As a rough guide, you need about 10 square metres (around 100 sq ft) of shadow-free roof for each kW of solar.
Does solar need regular spending after installation?
Very little. You mainly need panel cleaning and an annual inspection. The inverter may need replacement after 10 to 15 years.
Why is solar cheaper per kW for bigger systems?
Fixed costs such as design, transport, approvals and installation visits are spread across more panels, so the cost per kW usually falls as the system grows.
What extra costs should I expect beyond the quoted price?
Ask about structure height, extra cabling, DISCOM fees, roof repairs, monitoring modules and taxes, and check what the quote includes and excludes.
How much does inverter replacement cost?
It depends on the inverter capacity and brand. Inverters often need replacing after 10 to 15 years, so ask your installer for the likely cost and warranty.
Can I get a loan for a rooftop solar system?
Banks and financial institutions offer rooftop solar loans. Compare interest rates, repayment periods and charges before you choose.