Industrial Solar Panel Price in India: Cost per kW and per Watt
Industrial rooftop solar cost per kW and per watt in India, prices by system size, what sits outside the EPC quote, and how to compare proposals.
By PingB2B·Updated 15 August 2026
Short answer
Industrial rooftop solar in India runs roughly Rs 35,000 to Rs 50,000 per kW installed in 2026, or about Rs 35 to Rs 50 a watt. A 100 kW plant lands around Rs 40 to 60 lakh and a 1 MW rooftop around Rs 3.5 to 4.2 crore. Modules alone are only Rs 28 to 33 a watt — the balance is inverters, structure, cabling, installation and approvals.
1. What industrial rooftop solar costs
Installed cost for a complete rooftop system in 2026, before subsidy and before GST. Larger systems carry a lower per-kW rate because fixed engineering and approval costs spread further.
| System size | Installed cost | Per kW | Typical site |
|---|---|---|---|
| 25 kW | Rs 11-13 lakh | Rs 44,000-52,000 | Small workshop, office block |
| 100 kW | Rs 40-60 lakh | Rs 40,000-60,000 | Mid-sized factory unit |
| 500 kW | Rs 1.8-2.5 crore | Rs 36,000-50,000 | Textile mill, food processing plant |
| 1 MW | Rs 3.5-4.2 crore | Rs 35,000-42,000 | Large industrial rooftop |
2. Where the money actually goes
The most common misreading of a solar quote is treating the module price as the system price. Modules are the minority of it.
Modules: roughly Rs 28-33 per watt
Panels from established manufacturers sit in this band. It is the most visible line and the one buyers anchor on, but it is well under half the installed cost of a rooftop system.
The rest: roughly Rs 35-50 per watt all-in
Inverters, mounting structure, DC and AC cabling, protection equipment, earthing, monitoring, labour, and the approvals process. This is where quotes actually diverge, and where a cheap proposal is usually cheap.
Roof type and mounting complexity
A clear RCC roof is the cheap case. Sheet roofs, restricted access, and structures needing reinforcement all add cost before a single panel is fitted. Two quotes for the same kW on different roofs are not comparable.
Location
Installed prices vary roughly 5 to 15 percent across states, driven by labour rates, freight and local approval processes.
3. Comparing EPC quotes without being misled
- Compare on rupees per kW installed, not on module price per watt. A proposal that wins on module rate can lose badly on the balance of system.
- Confirm the inverter make and rating, not just its capacity. Inverters are the component most likely to be quietly downgraded to win a price comparison.
- Ask what generation the proposal guarantees, over what period, and what happens if it is missed. An unguaranteed yield estimate is marketing.
- Confirm which approvals, net-metering liaison and statutory clearances are in the EPC scope and which land back on you.
- Ask whether GST is included, and at what rate for your structure of purchase.
- Separate the warranty on modules, on inverters, and on workmanship. They are three different periods from three different parties.
4. Define the project scope
- Collect at least 12 months of electricity bills, sanctioned load, tariff category, interval data if available and planned load growth.
- Confirm roof ownership, available area, shading, roof condition, waterproofing constraints and structural capacity through qualified professionals.
- Decide whether the project is capex, lease or a power-purchase arrangement before comparing commercial proposals.
5. Compare like-for-like EPC proposals
| Scope item | What the proposal should state |
|---|---|
| Modules | Make, model, wattage, technology, datasheet and warranty |
| Inverters | Make, capacity, configuration, protections and warranty |
| Structure | Material, corrosion protection, design loads and roof interface |
| Generation model | Irradiance source, losses, degradation and annual estimate |
| Approvals | Responsibility for DISCOM, net metering and statutory steps |
| O&M | Monitoring, fault response, cleaning assumptions and service period |
6. Check equipment and warranty evidence
Module documentation
Request the exact module datasheet, serial-number traceability approach, product warranty and performance warranty. Compare warranty terms and exclusions, not only duration.
EPC capability
Ask for similar commissioned projects, safety process, design responsibility and service contacts. Confirm who owns warranty coordination if an inverter or module fails.
Design assumptions
Review the proposed layout, shading treatment, cable route, AC/DC protections and expected annual generation with an independent adviser or qualified internal team.
7. Plan acceptance and handover
- Include drawings, datasheets, test records, commissioning report, as-built layout, serial-number list and warranty documents in the handover checklist.
- Define commissioning tests, meter integration, monitoring access and a documented defect-correction period.
- Do not release final retention or milestone payment until contractual handover documents and agreed tests are complete.
8. Watch for proposal gaps
- An unusually high generation promise without stated assumptions, shading analysis or degradation is not comparable to a documented model.
- A low headline EPC cost may exclude strengthening, waterproofing, approvals, monitoring, safety equipment or taxes.
- Panel wattage alone is not system performance; engineering, roof constraints, inverter sizing and O&M affect output and uptime.
Browse solar panel suppliers
Use the directory after defining site constraints and the EPC scope. Ask each shortlisted supplier to quote the same module, inverter, structure, approval, and O&M requirements.
Official checks and useful references
Related buyer guides
Frequently asked questions
What does industrial solar cost per kW in India?
Roughly Rs 35,000 to Rs 50,000 per kW installed in 2026, before subsidy and GST. Larger systems sit at the lower end because engineering and approval costs spread across more capacity: a 1 MW rooftop runs around Rs 35,000 to 42,000 per kW, while a 25 kW system can be Rs 44,000 to 52,000.
Why is the module price so much lower than the system price?
Modules from established manufacturers cost roughly Rs 28 to 33 a watt, but installed systems run Rs 35 to 50 a watt. The difference is inverters, mounting structure, cabling, protection, earthing, monitoring, labour and approvals. Comparing quotes on module rate rather than installed cost per kW is the most common buyer error.
What does a 100 kW rooftop solar plant cost?
Around Rs 40 to 60 lakh installed, before subsidy and GST. The spread within that range is driven mainly by roof type and mounting complexity, inverter selection, and state-level differences in labour and approvals. Ask for the cost per kW installed so proposals for different sizes can be compared.
Should I buy solar panels directly or hire an EPC contractor?
For most industrial rooftops, an EPC scope provides a single party for design, installation, commissioning and warranty coordination. Direct procurement requires you to manage engineering, compatibility and installation interfaces yourself.
How should I compare solar generation estimates?
Compare the location, irradiance source, shading assumptions, system losses, degradation, availability and period used. A single annual-unit number without assumptions is not enough for a commercial decision or for evaluating savings and payback claims.
Do rooftop solar approvals vary by location?
Yes. Interconnection, net-metering and local permissions can depend on the state, DISCOM, customer category and project design. Confirm current requirements, timelines, documents, and responsible party before issuing the order or promising a commissioning date.
Ready to source?
Tell us what you need and we'll get back to you on WhatsApp.