4kW Solar Panel Price in India 2026: Cost, Subsidy, Generation and Savings

If your monthly electricity bill has crossed ₹3,000 and your consumption sits somewhere between 400 and 600 units, a 4 kW rooftop system is probably the size a good installer will suggest. The next question is the obvious one: what is the honest 4 kw solar panel price in 2026, and what do you actually pay after the government subsidy?

This guide answers that in numbers, not adjectives. You will find the full price range for on-grid, off-grid and hybrid 4 kW systems, a component-by-component cost breakdown, the exact subsidy math under PM Surya Ghar, which states add a top-up, how much roof you need, how many units the system will make, and how long the money takes to come back.

One thing worth saying upfront, because most articles skip it: the central subsidy is capped at ₹78,000. A 4 kW system gets the same ₹78,000 as a 3 kW system. That single fact changes the payback maths, and we will work through it properly below.

Quick Answer

A 4 kW on-grid solar system in India costs roughly ₹2,00,000 to ₹2,60,000 in 2026 before subsidy, and about ₹1,22,000 to ₹1,82,000 after the ₹78,000 PM Surya Ghar subsidy. Off-grid versions run ₹2.9–₹4.2 lakh and hybrid ₹3.2–₹4.5 lakh because of batteries. Expect around 16–18 units a day, 5,800–6,500 units a year, roughly 240–400 sq ft of shade-free roof, and a payback of about 3 to 5 years.

Who Should Buy a 4 kW System?

A 4 kW system is the sweet spot for a mid-to-large Indian home. In practical terms it fits a household that uses roughly 400 to 600 units a month, which usually means a 3BHK or 4BHK with two air conditioners, or a 2BHK where the ACs run hard through a long summer.

Below 300 units a month, a 3 kW system usually gives you better value per rupee, mainly because of the subsidy cap. Above 700 units a month, look at 5 kW or 6 kW instead.

Here is what 4 kW can support during daylight hours, when the panels are actually producing:

• One 1.5-ton inverter AC (1,200–1,500 W) running continuously, and a second AC for part of the day

• A double-door refrigerator (150–250 W) round the clock

• Six to eight ceiling fans (350–450 W total)

• Ten to twelve LED lights (100–150 W total)

• A washing machine (500 W), a television (100 W) and normal kitchen load

• A 1 HP water pump (750 W) for short bursts

An important clarification: on a grid-connected system you are not limited to what the panels make at that moment. The grid fills any gap automatically, and surplus daytime generation is exported and credited back to you. So “what 4 kW can run” is really about the annual energy balance, not a hard appliance limit.

4 kW Solar Panel Price in India 2026: On-Grid, Off-Grid and Hybrid

Prices below are turnkey. That means panels, inverter, mounting structure, cabling, protection gear, earthing, net meter co-ordination, installation and GST, with ALMM-listed equipment. They are ranges because the number genuinely moves with your state, roof type, panel brand and structure height.

Three things to note. First, off-grid systems do not qualify for the PM Surya Ghar subsidy, because the scheme is built around grid-connected, net-metered installations. Second, hybrid systems sit in a grey zone: several DISCOMs will sanction the subsidy on the solar portion if the system is properly net-metered and uses ALMM List-I modules with DCR cells, but this is not uniform, so confirm in writing before you order. Third, the battery is what makes off-grid and hybrid expensive. In 2026 lithium LiFePO4 costs roughly ₹18,000–₹35,000 per kWh installed against ₹8,000–₹14,000 per kWh for lead-acid tubular, but lithium gives you 80–90% usable depth of discharge versus about 50% for lead-acid, and 2,000–4,000+ cycles versus 500–800. Cheaper per kWh on paper is not cheaper per usable kWh over ten years.

Component-Wise Cost Breakdown of a 4 kW System

This is the table most quotations do not show you. The figures below are for a typical 4 kW on-grid system using DCR (domestic content) modules, which are mandatory if you want the subsidy.

How GST actually works on a rooftop quote. The GST Council’s 56th meeting on 3 September 2025 cut the rate on renewable energy devices from 12% to 5%, effective 22 September 2025. PIB estimated this made a 3 kW rooftop system about ₹9,000–₹10,500 cheaper. On a 4 kW system the saving is roughly ₹13,000–₹15,000.

But 5% is not the rate you pay on a full installation. A turnkey rooftop job is a composite supply: panels, inverter and other renewable energy devices are billed as goods at 5%, while the mounting structure, wiring, civil work and installation labour are services at 18%. The accepted industry split treats 70% of contract value as goods and 30% as services, which works out to an effective (0.70 × 5%) + (0.30 × 18%) = 8.9% on the total. Before September 2025 the same split came to 13.8%.

Two practical points. Your invoice must show the 5% and 18% lines separately — 8.9% is the arithmetic result, not a GST slab you can bill. And if you buy panels alone off the shelf, you pay only 5%, because there is no service component.

4 kW Solar Panel Price With Subsidy: The ₹78,000 Cap

Under PM Surya Ghar: Muft Bijli Yojana, the central subsidy for residential rooftop solar is:

Read that last row again. A 4 kW system receives exactly the same ₹78,000 as a 3 kW system. The fourth kilowatt is entirely at your own cost, which works out to roughly ₹50,000–₹65,000.

That is not a reason to avoid 4 kW. It is a reason to be deliberate about it. The extra kilowatt still produces about 1,500 units a year for 25 years, so it pays for itself in four to five years on its own merit. But if your consumption genuinely sits near 300 units a month, 3 kW gives you a better subsidy-to-cost ratio and you should not be talked upward.

Here is the net cost math for a 4 kW on-grid system:

The subsidy is paid by Direct Benefit Transfer into your bank account after the system is installed, inspected and commissioned, usually within 30 to 45 days. You pay the full amount to the installer first. As of 4 August 2026, roughly 50.06 lakh households had installed under the scheme, 14.8 GW in total, with ₹28,024 crore already disbursed by DBT.

State Top-Up Subsidies in 2026

Some states add money on top of the central subsidy. This is the area where online information is least reliable, so treat the table below as a starting point for a phone call to your DISCOM, not as a promise.

Two honest cautions. State top-ups are budget-linked and frequently pause when the allocation runs out, and several widely circulated figures online are simply outdated Phase-II numbers from before PM Surya Ghar absorbed the older state schemes in 2024. Never sign a contract on the assumption of a state top-up unless your DISCOM or state nodal agency has confirmed it in writing.

Roof Space and Generation From 4 kW

You need roughly 60 to 100 sq ft of shade-free roof per kW. So a 4 kW system needs about 240 to 400 sq ft. High-efficiency TOPCon modules sit at the lower end, around 240–280 sq ft, while older polycrystalline panels or an elevated structure with wide walkways push you toward 400 sq ft.

On generation, the Indian rule of thumb is 4 to 4.5 units per kW per day, averaged across the year.

Gujarat and Rajasthan sit at the top of that range. Coastal Kerala, Bengal and the north-east sit lower because of cloud cover and humidity. Dust matters more than people expect. Soiling typically costs 3–8% of output, and 15–25% in dusty or industrial areas if panels go unwashed for months. A fortnightly rinse in dry season is not optional maintenance, it is your yield.

Savings and Payback: A Worked Example

Take a household in Surat using 550 units a month with a marginal slab tariff of ₹8 per unit including fixed charges and duty. They install a 4 kW on-grid system at ₹2,36,000 and receive ₹78,000 back, so their net cost is ₹1,58,000. Generation is 6,000 units in year one.

Assumptions: 0.5% annual panel degradation and 3% annual tariff escalation. Both are conservative and stated openly so you can re-run them with your own numbers.

Payback: cumulative savings cross the ₹1,58,000 net cost during year four, at about 3 years and 3 months. If your tariff is lower, say ₹6 per unit, the same system pays back in about 4 years and 4 months. If you get no state top-up and pay at the top of the price range, expect closer to five years.

25-year picture: gross savings of roughly ₹16.4 lakh. Subtract the ₹1.58 lakh net investment, about ₹1 lakh of cleaning and maintenance over 25 years, and one inverter replacement of ₹35,000–₹45,000 around year 12. That leaves a net gain in the region of ₹13 lakh, and this excludes any earnings from exported surplus. Under PM Surya Ghar, more than 12 lakh households earned ₹421 crore from surplus export in FY 2024-25, roughly ₹3,500 per household per year.

Homeowners in Gujarat can also read our guide to the residential solar subsidy in Gujarat for state-specific eligibility and application information.

Financing a 4 kW System

You do not have to pay ₹2.36 lakh in one go. PM Surya Ghar includes a collateral-free loan of up to ₹2 lakh at repo plus 0.50%, which is about 5.75% at the current RBI repo rate of 5.25%, tenure up to 10 years. Note the fine print: that concessional slab is designed for systems up to 3 kW. A 4 kW system will usually fall into the next slab, around 7.90% for the ₹2–6 lakh bracket at SBI, with similar structures at Bank of India, PNB and Indian Overseas Bank. IREDA’s retail arm also lends for rooftop solar, and NBFCs and fintechs will quote 10–16%.

Indicative EMIs on the net cost of ₹1,58,000, once the subsidy has been credited and part-prepaid:

• 5 years at 5.75%: about ₹3,035 per month

• 7 years at 5.75%: about ₹2,290 per month

• 10 years at 7.90% on the full ₹2,36,000: about ₹2,850 per month

Against monthly savings of roughly ₹4,000, the EMI is smaller than the bill it replaces from month one. Rates change, so confirm the current number with the bank before you commit.

What Pushes the 4 kW Price Up or Down

• DCR vs non-DCR panels. DCR modules use Indian cells and Indian modules, and they cost noticeably more: DCR TOPCon was around ₹22.3 per Wp ex-works in April 2026 against ₹14.2 per Wp for non-DCR TOPCon. DCR is compulsory for the subsidy, so a non-subsidised system is cheaper per watt but you forfeit ₹78,000.

• TOPCon vs mono PERC. TOPCon costs a little more per watt but gives higher efficiency, better performance in heat, and lower annual degradation. On a tight roof it can be the difference between fitting 4 kW and not.

• Structure height. A standard 3–4 ft structure is included in most quotes. An elevated structure that clears a water tank or creates parking below adds roughly ₹3,000–₹8,000 per kW.

• Cable runs. If your inverter and meter sit far from the array, longer DC and AC runs add cost and a little loss.

• Brand and warranty depth. Tier-1 modules and reputed inverter brands cost more upfront and are cheaper over 25 years.

• Roof type. Tin sheet, RCC and sloped tile roofs all need different mounting hardware and labour.

The 2026 Update: ALMM, DCR and Net Metering

Two policy changes shape 2026 pricing. First, ALMM List-II, the approved list of domestic solar cells, came into force on 1 June 2026 for government and government-supported projects, net-metered projects and open-access projects commissioned after that date. Combined with the existing ALMM List-I requirement for modules, this means subsidised residential systems must use Indian cells in Indian modules. MNRE declined a blanket extension but allows case-by-case relief through the DCR portal. Panels are now checked at inspection, and non-listed panels get rejected outright. ALMM List-III, covering ingots and wafers, is scheduled for 1 June 2028.

Second, net metering rules keep evolving. Net metering is the arrangement where a bidirectional meter counts the units you export to the grid and offsets them against the units you import. Residential caps vary widely, from around 10 kW in Maharashtra to far higher limits in Delhi, Gujarat and Rajasthan, so 4 kW is comfortably within limits everywhere. Under the Electricity (Rights of Consumers) Rules, the DISCOM is expected to install the bidirectional meter within 30 working days of approval. Karnataka has introduced virtual net metering for housing societies, and there is national-level discussion about gross metering for larger new systems, with grandfathering proposed for existing consumers. For a 4 kW home system in 2026, standard net metering still applies.

Warranties You Should Expect

Ask for warranty documents in the manufacturer’s name, not the installer’s letterhead. If the installer disappears, the manufacturer warranty is what remains.

Installation Timeline, Step by Step

1. Site survey and quotation (day 1–3). Roof measurement, shadow analysis, sanctioned load check, written quote.

2. Registration on the national portal (day 3–5). Apply at pmsuryaghar.gov.in, pick a registered vendor. There were 34,219 registered vendors as of August 2026.

3. DISCOM feasibility approval (day 5–20). The DISCOM checks whether your transformer and sanctioned load can take the system.

4. Material delivery and installation (day 20–27). Structure, panels, inverter, cabling, earthing. A 4 kW job is typically 2–3 working days on the roof.

5. Net meter application and installation (day 27–45). The DISCOM installs the bidirectional meter.

6. Inspection and commissioning (day 45–55). Panels are checked against ALMM, the system is tested and the commissioning certificate is issued.

7. Subsidy claim and DBT credit (day 55–90). Upload the certificate and bank details. Money lands in your account.

Six to ten weeks end to end is realistic. Delays almost always sit with feasibility approval or net meter installation, not with the physical build.

Common Mistakes to Avoid

Oversizing. The most expensive mistake. Because the subsidy caps at ₹78,000, every kilowatt above 3 kW is fully self-funded. Size to your actual annual consumption, not to your worst summer month.

Undersized cables. Thin DC cable saves a few thousand rupees and costs you 2–4% of output every year for 25 years, plus a fire risk. Insist on the cable specification in writing.

Cheap mounting structure. A light or poorly galvanised structure rusts in coastal air and fails in a storm, taking ₹1 lakh of panels with it. Ask for the GI thickness and the wind-speed rating.

Using an unregistered vendor. If your installer is not on the national portal, your subsidy claim will not process. Verify the registration number before paying an advance.

Ignoring shade. A single chimney shadow across one panel can drag down a whole string. A proper shadow analysis at the survey stage is non-negotiable.

Assuming a state top-up exists. Budget on the central ₹78,000 alone and treat any state money as a bonus.

Frequently Asked Questions

Q1. What is the 4 kw solar panel price in India in 2026?

A 4 kW on-grid system costs roughly ₹2,00,000 to ₹2,60,000 turnkey, including panels, inverter, structure, cabling, protection, installation and 5% GST. That works out to about ₹50,000 to ₹65,000 per kW. Off-grid versions cost ₹2.9–₹4.2 lakh and hybrid systems ₹3.2–₹4.5 lakh because of battery cost. Prices vary by state, roof type, panel brand and structure height.

Q2. What is the 4 kw solar panel price with subsidy?

After the ₹78,000 PM Surya Ghar subsidy, the net cost of a 4 kW on-grid system is about ₹1,22,000 to ₹1,82,000, with ₹1,58,000 a fair typical figure. You pay the installer in full first, and the subsidy is credited to your bank account by Direct Benefit Transfer after inspection and commissioning, usually within 30 to 45 days.

Q3. Why does a 4 kW system get the same subsidy as a 3 kW system?

Because PM Surya Ghar caps the residential subsidy at ₹78,000, which is reached at 3 kW. The scheme pays ₹30,000 for 1 kW, ₹60,000 for 2 kW and ₹78,000 for 3 kW and above. Every kilowatt beyond the third is fully at your cost, roughly ₹50,000 to ₹65,000, though it still generates about 1,500 units a year for 25 years.

Q4. How many units does a 4 kW solar system generate?

About 16 to 18 units a day on average, which is roughly 480 to 540 units a month and 5,800 to 6,500 units a year. Clear summer days in Gujarat or Rajasthan can touch 20 to 22 units, while overcast monsoon days may give only 4 to 8. Annual totals matter more than any single day.

Q5. How much roof space does a 4 kW system need?

Around 240 to 400 sq ft of shade-free roof. High-efficiency TOPCon modules need about 60 to 70 sq ft per kW, so roughly 240 to 280 sq ft in total. Older or lower-efficiency panels, tilted structures and walkway clearance push the requirement toward 400 sq ft. Shade-free matters more than raw area.

Q6. How many panels are in a 4 kW system?

Seven to eight panels if you use modern 545 Wp to 590 Wp modules, which is what most installers supply in 2026. With older 330 Wp panels you would need twelve or thirteen. Fewer, larger panels usually mean fewer connections, less structure and a tidier roof, though the wattage total is what determines your output.

Q7. What is the payback period for a 4 kW solar system?

Typically three to five years. At a marginal tariff of ₹8 per unit and a net cost of ₹1,58,000, cumulative savings cross the investment at about three years and three months. At ₹6 per unit it stretches to roughly four years and four months. Higher tariffs, better sunlight and a state top-up all shorten it.

Q8. How much can I save over 25 years with 4 kW?

On the assumptions used above, 0.5% annual degradation and 3% tariff escalation from ₹8 per unit, gross savings are around ₹16.4 lakh over 25 years. After subtracting the net investment, cleaning and maintenance, and one inverter replacement around year 12, the net gain is roughly ₹13 lakh. Export earnings would add to this.

Q9. Is off-grid or hybrid eligible for the PM Surya Ghar subsidy?

Off-grid systems are not eligible, because the scheme is designed for grid-connected, net-metered installations. Hybrid systems sit in a grey area. Some DISCOMs sanction the subsidy on the solar portion if the system is properly net-metered and uses ALMM List-I modules with DCR cells, but this is not uniform. Get written confirmation before ordering.

Q10. What is DCR and why does it raise the price?

DCR stands for Domestic Content Requirement. It means the cells and modules must be made in India, and it is mandatory for subsidised residential systems. DCR TOPCon modules were priced around ₹22.3 per Wp ex-works in April 2026 against ₹14.2 per Wp for non-DCR TOPCon. You pay more per watt, but you gain ₹78,000 in subsidy, which more than covers the difference on a 4 kW system.

Q11. What is ALMM and does it affect my installation?

ALMM is the Approved List of Models and Manufacturers. List-I covers modules and is mandatory for subsidised and net-metered projects. List-II covers domestic solar cells and came into force on 1 June 2026 for government-supported, net-metered and open-access projects. Panels are checked at inspection and non-listed panels are rejected, which can void your subsidy claim entirely.

Q12. What is net metering in simple terms?

Net metering is the arrangement where your DISCOM installs a bidirectional meter that counts both the units you draw from the grid and the units your solar system sends back. You are billed only on the net difference. Surplus units are typically carried forward as credits and settled at the end of the billing year at a rate the state regulator sets.

Q13. Can I get a loan for a 4 kW solar system?

Yes. PM Surya Ghar offers collateral-free loans up to ₹2 lakh at repo plus 0.50%, about 5.75% today, but that concessional slab targets systems up to 3 kW. A 4 kW system usually falls into the next bracket, around 7.90% for ₹2–6 lakh at SBI, with similar terms at Bank of India, PNB and IOB. IREDA and NBFCs also lend. Confirm current rates with the bank.

Q14. What EMI should I expect?

On a net cost of ₹1,58,000, roughly ₹3,035 a month over five years at 5.75%, or about ₹2,290 a month over seven years. If you finance the full ₹2,36,000 over ten years at 7.90%, the EMI is about ₹2,850. Since monthly savings run near ₹4,000, the EMI is usually smaller than the electricity bill it replaces.

Q15. Which states give an extra subsidy on top of ₹78,000?

Uttar Pradesh is the most consistently reported, at ₹15,000 per kW capped at ₹30,000 through UPNEDA. Delhi offers a top-up plus a generation-based incentive. Gujarat and Rajasthan appear in some sources but the reported amounts conflict. Haryana, Kerala and West Bengal have no confirmed general residential top-up. Always confirm with your DISCOM or state nodal agency.

Q16. How long does installation take from application to subsidy?

Six to ten weeks end to end. The physical installation of a 4 kW system takes only two to three days on the roof. The time goes into DISCOM feasibility approval, net meter installation and inspection. The subsidy is usually credited by DBT within 30 to 45 days of commissioning, so budget for around three months in total.

Q17. What maintenance does a 4 kW system need?

Mostly cleaning. Dust cuts output by 3 to 8% typically, and 15 to 25% in dusty or industrial areas if panels go unwashed for months. Wash panels every two to four weeks in the dry season. Beyond that, an annual electrical check of connections, earthing and inverter logs is enough. Budget ₹3,000 to ₹5,000 a year.

Q18. Should I choose 3 kW or 4 kW?

Compare your annual consumption, not the subsidy alone. If you use under 350 units a month, 3 kW captures the full ₹78,000 subsidy against a smaller outlay and gives the better subsidy-to-cost ratio. If you consistently use 400 to 600 units, 4 kW is the right size, and the unsubsidised fourth kilowatt still pays for itself in four to five years.

Q19. Can a 4 kW system run my air conditioner?

Yes, during daylight hours a 4 kW system comfortably runs one 1.5-ton inverter AC along with normal household load, and a second AC for part of the day. On a grid-connected system this is not a hard limit anyway. The grid covers any shortfall instantly, and your solar generation offsets the total on your bill.

Q20. Do I earn money from surplus units?

Usually as credits rather than cash, adjusted against future bills, with an annual settlement at the state-approved rate. Under PM Surya Ghar, more than 12 lakh households earned ₹421 crore from surplus export in FY 2024-25, about ₹3,500 per household per year. The exact rate and settlement rules vary by state, so check your DISCOM’s net metering regulations.

Talk to a Solnce Expert

Solnce Energy has installed over 100 MW of solar and serves 1,500+ customers across rooftop, C&I, solar parks and PPAs. We are based in Surat, Gujarat, and were backed on Shark Tank India Season 4. If you want a 4 kW quote based on your actual bill, roof and DISCOM, our team will size it honestly and tell you if 3 kW or 5 kW suits you better. Reach out for a site survey and a written, itemised quotation.