Solar cost in Delhi changes sharply with system size, and the three sizes that cover almost every Delhi home are 3 kW, 5 kW, and 10 kW. In 2026, a 3 kW rooftop system from an MNRE-empanelled installer costs ₹1,98,000 to ₹2,33,000 gross and ₹1,20,000 to ₹1,55,000 after the ₹78,000 PM Suryaghar subsidy. A 5 kW system nets ₹1,80,000 to ₹2,25,000. A 10 kW system nets ₹3,25,000 to ₹4,10,000. This guide is the size-by-size companion to our full solar installation cost in Delhi guide: price tables per size, what each size generates at Delhi’s 5.0 to 5.5 peak sun hours, what it saves at BSES and TPDDL tariffs of ₹3.00 to ₹8.00 per kWh, and how to pick the right one for your bill and your DISCOM.
Direct answer. In Delhi in 2026, a 3 kW solar system costs ₹1,20,000 to ₹1,55,000 after the ₹78,000 PM Suryaghar subsidy, a 5 kW costs ₹1,80,000 to ₹2,25,000, and a 10 kW costs ₹3,25,000 to ₹4,10,000. Generation runs 360 to 480, 600 to 800, and 1,200 to 1,600 kWh per month respectively. Payback at BSES and TPDDL tariffs is 4 to 6 years for 3 kW and 3.5 to 5 years for the larger sizes. Heaven Green Energy is MNRE-empanelled across all three Delhi DISCOMs.
One thing before the tables: the ₹78,000 subsidy is capped at 3 kW for individual homes. Going from 3 kW to 5 kW or 10 kW adds zero extra subsidy from MNRE (Ministry of New and Renewable Energy). That single fact drives most of the sizing math below, along with one Delhi-specific rule: DERC (Delhi Electricity Regulatory Commission) caps your solar system at 90 percent of your sanctioned load.
3kW Solar System Cost in Delhi
The 3 kW system is Delhi’s volume seller because it captures the full ₹78,000 PM Suryaghar subsidy, fits the default sanctioned load on most residential connections, and covers 60 to 80 percent of a typical 2 to 3 BHK bill. The subsidy math is ₹30,000 for the first kW, ₹30,000 for the second, and ₹18,000 for the third, totalling ₹78,000 as per the MNRE 2026 schedule on pmsuryaghar.gov.in.
| Cost item | Amount (Delhi, 2026) |
|---|---|
| Gross turnkey price | ₹1,98,000 to ₹2,33,000 |
| PM Suryaghar subsidy | ₹78,000 |
| Net cost after subsidy | ₹1,20,000 to ₹1,55,000 |
| Monthly generation | 360 to 480 kWh |
| Annual saving (₹6.00 to ₹7.00 blended tariff) | ₹26,000 to ₹40,000 |
| Roof area needed | 250 to 300 sqft shadow-free |
| Typical payback | 4 to 6 years |
That gross price buys a complete on-grid system: 6 to 8 ALMM-listed mono PERC panels of 450 to 545 Wp, a BIS (Bureau of Indian Standards) certified string inverter, galvanised mounting structure, DC and AC cabling, DCDB and ACDB protection boxes, earthing, and the net metering application. For the item-by-item split, see our solar panel cost breakdown.
Best fit: a monthly BSES or TPDDL bill of ₹2,000 to ₹4,000, one 1.5-ton air conditioner used sensibly, and a family of 3 to 5. Delhi’s tariff structure makes 3 kW unusually attractive: a home consuming 400 to 500 units per month sits in the ₹6.50 to ₹7.50 slab, so every solar unit saves serious money even at this small size.
Loan route: under PM Suryaghar’s collateral-free window, public sector banks finance up to ₹2 lakh at about 6.75 percent. The post-subsidy ₹1,37,500 midpoint financed over 5 years works out to roughly ₹2,700 per month EMI, which is close to the bill saving itself. The full EMI math per size is in our solar loan EMI guide for 3kW, 5kW and 10kW.
⚠️ Watch out
Delhi's winter fog season (December to January) cuts solar generation by 20 to 30 percent in those months. A homeowner on a 3 kW system in Delhi will see roughly 280 to 320 kWh in a fog month versus 390 to 450 kWh in May. Budget for this in your annual savings estimate; never accept a proposal built only on summer generation figures.
5kW Solar System Cost in Delhi
The 5 kW system is the standard upgrade for Delhi homes that outgrow the 3 kW ceiling. The subsidy stays capped at ₹78,000, so the extra 2 kW is full retail price, but the generation jump to 600 to 800 kWh per month comfortably handles two air conditioners running 6 to 8 hours daily through a Delhi summer, a geyser, and a work-from-home setup.
| Cost item | Amount (Delhi, 2026) |
|---|---|
| Gross turnkey price | ₹2,58,000 to ₹3,03,000 |
| PM Suryaghar subsidy | ₹78,000 |
| Net cost after subsidy | ₹1,80,000 to ₹2,25,000 |
| Monthly generation | 600 to 800 kWh |
| Annual saving (₹7.00 to ₹7.50 blended tariff) | ₹50,000 to ₹72,000 |
| Roof area needed | 450 to 550 sqft shadow-free |
| Typical payback | 3.5 to 4.5 years |
Notice the per-kW cost drops: 5 kW works out to roughly ₹51,600 to ₹60,600 per kW gross versus ₹66,000 to ₹77,600 for 3 kW, because the inverter, structure, and labour scale sub-linearly. The per-kW saving is real and larger in Delhi than in most cities because Delhi labour and access costs are 5 to 10 percent higher, per industry-observed ranges.
Best fit: a monthly bill of ₹4,000 to ₹9,000, a 3 to 4 BHK in areas like Dwarka, Rohini, Vasant Kunj, or Preet Vihar, and consumption of 600 to 900 units per month. At that usage you sit in the ₹6.50 to ₹8.00 slabs, where every solar unit saves the most. This is why 5 kW payback (3.5 to 4.5 years) often beats 3 kW payback (4 to 6 years) despite the lower subsidy density: the savings are priced at upper-slab rates.
One honest caveat: if your bill is ₹3,500 or below, a 5 kW system will over-generate. Surplus units exported to your DISCOM are settled at the DERC feed-in rate of roughly ₹3.00 to ₹3.50 per kWh instead of saving you ₹7 or more, and that stretches payback by a year or more. Size to your bill, not to your roof.
Curious what a 5 kW would save on your exact Delhi bill? Our free solar calculator takes your bill amount, DISCOM, and roof type and returns size, subsidy, savings, and payback in 60 seconds.
10kW Solar System Cost in Delhi
The 10 kW system is the practical residential ceiling in Delhi and the choice of large independent houses, villas, and farmhouses in areas like Chhatarpur, Sainik Farms, and the outskirts of Dwarka. It is also where buyers most often overspend, because a 10 kW quote looks impressive and the subsidy framing gets murky.
| Cost item | Amount (Delhi, 2026) |
|---|---|
| Gross turnkey price | ₹4,03,000 to ₹4,88,000 |
| PM Suryaghar subsidy | ₹78,000 |
| Net cost after subsidy | ₹3,25,000 to ₹4,10,000 |
| Monthly generation | 1,200 to 1,600 kWh |
| Annual saving (₹7.50 to ₹8.00 blended tariff) | ₹1,08,000 to ₹1,53,000 |
| Roof area needed | 800 to 1,000 sqft shadow-free |
| Typical payback | 3.5 to 4.5 years |
The ₹78,000 subsidy is the same as a 3 kW system gets. It does not scale. That means only about 16 to 19 percent of a 10 kW gross cost is subsidised, versus 33 to 39 percent for a 3 kW. The system still pays back well because Delhi’s upper-slab tariffs are among the highest in India and per-kW hardware cost falls at this size, but the subsidy story vendors tell at 10 kW is often inflated.
Best fit: monthly bills above ₹9,000, consumption of 1,200 to 1,800 units, three or more air conditioners, possibly an EV charger, and a sanctioned load that supports 10 kW. Check the sanctioned load on your bill first. Under DERC rules, solar capacity cannot exceed 90 percent of your contracted load, so a 10 kW system needs roughly 11 kW or more of sanctioned load. If your bill says 5 kW, you need a load enhancement application with your DISCOM before approval; our sanctioned load mismatch guide explains that workflow.
💡 Fast tip
Homeowners on X regularly report being told the subsidy scales with system size, so they upsize from 3 kW to 5 kW or 10 kW expecting proportionally more money back. It does not. The cap is ₹78,000 for any individual residential system of 3 kW or above, per MNRE 2026. Only housing society common-area systems use a different slab of ₹18,000 per kW.
Which Size Should You Pick? The Slab-First Sizing Method
Our proprietary framework for this decision is the Heaven Green Slab-First Sizing Method, developed across our Delhi installations. Definition: the right system size is the smallest size that passes all three locks, with the bill lock weighted by the tariff slab your top units sit in, not your average rate. If a size fails any lock, drop down or fix the constraint first.
- Bill lock (slab-adjusted). Look at which slab your last 100 to 200 units fall in. In Delhi, a home crossing 800 units pays ₹7.50 to ₹8.00 on the top slice, so solar offsetting those units pays back fastest. Divide your average monthly bill by ₹1,500 for a rough kW figure: a ₹4,500 bill gives 3 kW, a ₹7,500 bill gives 5 kW.
- Roof lock. Measure your shadow-free terrace area in sqft and divide by 100. A 450 sqft clear roof caps you at about 4.5 kW regardless of what your bill says. Water tanks, mumty rooms, and neighbour-building shadows all subtract, and Delhi’s tall adjoining houses shade more roofs than in low-rise cities.
- Sanctioned-load lock. Your sanctioned load, printed on your bill, caps the system size at 90 percent under DERC rules. Most Delhi homes carry 3 to 5 kW. Enhancement is possible but adds 2 to 4 weeks before the feasibility step.
The smallest passing size wins. Here is the decision table we use on site visits:
| Monthly bill | Slab your top units sit in | Roof needed | Recommended size | Net cost after subsidy |
|---|---|---|---|---|
| ₹2,000 to ₹4,000 | ₹5.00 to ₹6.50 | 250 to 300 sqft | 3 kW (full subsidy) | ₹1,20,000 to ₹1,55,000 |
| ₹4,000 to ₹9,000 | ₹6.50 to ₹7.50 | 450 to 550 sqft | 5 kW | ₹1,80,000 to ₹2,25,000 |
| Above ₹9,000 | ₹7.50 to ₹8.00 | 800 to 1,000 sqft | 10 kW | ₹3,25,000 to ₹4,10,000 |
For the national version of this comparison with city-by-city generation, read our home solar system size guide. For payback methodology including export-credit adjustments, the solar payback period explained guide shows the full calculation.
BSES and TPDDL Tariffs, Savings and Payback by Size
Your savings depend on which slab your consumption touches, because solar offsets your most expensive units first under net metering. Delhi’s 2026 residential slabs across BSES Rajdhani, BSES Yamuna, and TPDDL: ₹3.00 to ₹4.50 per kWh up to 200 units, ₹5.00 to ₹6.50 for 201 to 400, ₹6.50 to ₹7.50 for 401 to 800, and ₹7.50 to ₹8.00 above 800 units, per DERC tariff orders on derc.gov.in.
| System size | Units offset per month | Slab where savings land | Monthly saving | Annual saving | Payback (net cost) |
|---|---|---|---|---|---|
| 3 kW | 360 to 480 kWh | ₹5.00 to ₹6.50 | ₹2,200 to ₹3,300 | ₹26,000 to ₹40,000 | 4 to 6 years |
| 5 kW | 600 to 800 kWh | ₹6.50 to ₹7.50 | ₹4,200 to ₹6,000 | ₹50,000 to ₹72,000 | 3.5 to 4.5 years |
| 10 kW | 1,200 to 1,600 kWh | ₹7.50 to ₹8.00 | ₹9,000 to ₹12,800 | ₹1,08,000 to ₹1,53,000 | 3.5 to 4.5 years |
Two nuances the table hides. First, these figures assume 80 percent self-consumption. Daytime-empty homes self-consume less, and the excess exports at the DERC feed-in rate of roughly ₹3.00 to ₹3.50 per kWh, which stretches payback. Second, Delhi’s winter fog means your annual generation is back-loaded into March to October; a vendor quoting flat monthly generation year-round is quoting fiction.
Delhi also has a generation-based incentive under the Delhi Solar Policy that X chatter and DISCOM campaigns describe as ₹3 per unit for systems up to 3 kW and ₹2 per unit for 3 to 10 kW, capped over five years. Treat this as a bonus on top of the numbers above, not a guarantee: confirm the current status and your eligibility with your DISCOM before counting it in a payback calculation, because as of 2026 the central PM Suryaghar subsidy remains the only confirmed stacked capital support. Rooftop additions across the city are tracked in grid data from the Central Electricity Authority at cea.nic.in, with Delhi crossing 20,000 residential systems by mid-2026 per DISCOM announcements.
What Changes the Price Within Each Size
Every size band above has a ₹35,000 to ₹85,000 range inside it. Four variables drive that range, and none of them are arbitrary.
Panel technology. ALMM-listed mono PERC panels from Waaree or Goldi Solar run ₹22 to ₹25 per Wp. Premium TOPCon panels from Adani Solar run ₹28 to ₹34 per Wp. On a 10 kW system that gap alone is ₹60,000 to ₹1,00,000. For Delhi’s 45-degree summers, TOPCon’s lower temperature coefficient buys 3 to 5 percent more generation from April to June, per module performance data tracked under MNRE’s ALMM program.
Inverter class. A standard string inverter adds ₹15,000 to ₹20,000 at 3 kW and ₹40,000 to ₹55,000 at 10 kW. Hybrid inverters that accept batteries later cost ₹25,000 to ₹45,000 more. The inverter sizing guide from Qbits Energy walks through the string versus hybrid decision with real spec sheets.
Structure and roof work. Delhi roofs vary wildly: flat RCC terraces in Dwarka, sloped roofs in older colonies, and parapet-heavy barsati roofs. Ballasted structures for flat roofs cost less than anchor-drilled ones for sloped or older roofs, and pre-galvanised structures cost ₹3,000 to ₹5,000 more but outlast standard GI by years in Delhi’s dust and monsoon cycle.
Access and documentation. Multi-storey buildings, RWA approvals, and DISCOM paperwork add cost in Delhi. DISCOM application and documentation fees run ₹2,500 to ₹4,000 with BSES and ₹3,000 to ₹5,000 with TPDDL. Any quote below ₹60,000 per kW gross in Delhi should trigger questions about panel provenance, inverter certification, or missing protection equipment. The state-by-state DISCOM net metering guide from Heaven Designs shows what a complete Delhi application file should contain.
Mistakes Delhi Buyers Make, by Size
The failures we see on re-surveys cluster by size. The red-flag list below is ordered by how much money each mistake wastes.
-
1
Upsizing for subsidy that does not exist, moving from 3 kW to 5 kW expecting ₹1,30,000 back. The cap is ₹78,000. The extra 2 kW is full retail.
-
2
Installing 5 kW or 10 kW on a low sanctioned load, which breaches DERC's 90 percent rule and gets the net metering application rejected while the load enhancement crawls through BSES or TPDDL.
-
3
Believing zero-bill marketing for a 3 kW system on a home with two or more ACs. X users in Delhi report real 3 kW output of 2 to 2.5 kW at peak because of heat, dust, and pollution. A 3 kW system covers 60 to 80 percent of a moderate bill, not 100 percent of a heavy one.
-
4
Accepting a below-market 3 kW quote under ₹1,90,000 gross, which almost always means non-ALMM panels (subsidy ineligible), a missing BIS certificate number, or no DCDB and surge protection.
-
5
Skipping the RWA NOC in apartment complexes, which can trigger removal notices after installation. Get written RWA approval before your vendor files the DISCOM application.
The thread connecting all five: sizing and pricing decisions made without your actual bill, your actual roof, and your actual sanctioned load. Run the Slab-First Sizing Method first and three of these five mistakes disappear.
How to Buy: PM Suryaghar Steps for Each Size in Delhi
The process is the same across sizes; only the sanctioned-load check, RWA step, and loan amount change. Register on the PM Suryaghar national portal and follow this sequence:
- Identify your DISCOM from your bill header: BSES Rajdhani (South and West Delhi), BSES Yamuna (East and Central Delhi), or TPDDL (North and Northwest Delhi). Selecting the wrong one fails your application at feasibility.
- Register with your consumer number and Aadhaar-linked mobile. The name on the bill must match Aadhaar exactly; X users report subsidy limbo over minor mismatches.
- Upload documents: last 3 months of bills, Aadhaar, bank passbook, property proof, and RWA NOC for apartments.
- Get feasibility approval from your DISCOM, typically 12 to 20 days. For 5 kW and 10 kW, confirm the sanctioned load here.
- Choose an empanelled vendor from the portal list. Heaven Green Energy is empanelled for BSES Rajdhani, BSES Yamuna, and TPDDL.
- Install in 1 to 3 days for 3 kW and 5 kW, 3 to 5 days for 10 kW.
- Net meter installation within 15 to 25 days of inspection. DERC’s net metering order requires BSES to complete meter installation within 15 days of a satisfactory inspection.
- Subsidy via DBT (Direct Benefit Transfer) into your bank account within 30 days of meter commissioning.
📘 Regulation note
In July 2026, DERC amended Delhi's net metering guidelines, replacing the older three-tier application and registration process for rooftop solar, as reported by Mercom India. The practical effect for buyers: a simpler application flow, but the 90 percent sanctioned-load cap and BIS certification checks remain.
For the full BSES walkthrough, see our PM Suryaghar BSES Delhi guide, and for the all-Delhi view across TPDDL as well, the PM Suryaghar Delhi guide. Total timeline from registration to subsidy: 60 to 90 days with clean documents, up to 100 days if RWA approval or load enhancement is involved.
Is a Bigger System Worth It in Delhi?
The tradeoff between right-sizing and oversizing, in plain Delhi terms:
- ✓ Fastest payback, 3.5 to 5 years at Delhi's upper slabs
- ✓ Full subsidy density at 3 kW, up to 39 percent of gross cost
- ✓ No sanctioned-load enhancement delays at 3 kW
- ✓ Lower EMI fits the PM Suryaghar ₹2 lakh loan window
- ✗ Surplus exports earn the DERC feed-in rate of ₹3.00 to ₹3.50, not ₹7 to ₹8
- ✗ Zero extra subsidy above 3 kW, extra capacity is full retail
- ✗ Load enhancement adds 2 to 4 weeks before approval
- ✗ Payback stretches by 0.5 to 1.5 years on wasted export
Verdict. For most Delhi homes, 3 kW is the densest subsidy buy and 5 kW is the best value for two-AC households in the ₹6.50 to ₹7.50 slab. Go to 10 kW only when your bill, roof, and sanctioned load all clear the bar. The exception is a home planning an EV purchase within two years, where sizing up once beats a costly expansion later. For the scheme-level view, our PM Suryaghar complete guide covers the national rules, and the net metering in India guide explains how DERC settlement compares with other states.
How Heaven Green Energy Helps
Heaven Green Energy is an MNRE-approved channel partner with 10,000-plus installations across India and a Delhi team experienced in all three DISCOM processes, BSES Rajdhani, BSES Yamuna, and TPDDL. Every Delhi quote starts with the Slab-First Sizing Method applied on a free physical site survey: shadow analysis that accounts for neighbour buildings, roof measurement, and a sanctioned-load check against your actual bill. Subsidy filing, net metering coordination, RWA documentation support, and after-sales service are included in every turnkey price quoted in this guide.
- Residential Solar: 1 to 10 kW rooftop systems with PM Suryaghar subsidy handled end to end, the exact service behind every price in this guide.
- Commercial Solar: 10 to 100 kW for Delhi offices, clinics, and shops with custom ROI modelling.
- Solar Calculator: your size, subsidy, and payback in 60 seconds.
- Contact Us: free site visit within 24 hours, itemised proposal within 48 hours.
Ready to lock your size with real numbers? Get a free site assessment and our Delhi engineer will run all three locks on your roof, bill, and sanctioned load, then send a fixed quote in 48 hours.
Frequently Asked Questions
How much does a 3kW solar system cost in Delhi after subsidy?
A 3 kW system costs ₹1,98,000 to ₹2,33,000 gross from an MNRE-empanelled installer with ALMM-listed panels and a BIS-certified inverter. After the ₹78,000 PM Suryaghar subsidy, net cost is ₹1,20,000 to ₹1,55,000. It generates 360 to 480 kWh per month and pays back in 4 to 6 years at mid-slab BSES and TPDDL tariffs, faster for upper-slab consumers.
How much does a 5kW solar system cost in Delhi after subsidy?
A 5 kW system costs ₹2,58,000 to ₹3,03,000 gross and ₹1,80,000 to ₹2,25,000 after the ₹78,000 subsidy. It generates 600 to 800 kWh per month. At Delhi’s ₹6.50 to ₹7.50 upper slabs, annual savings are ₹50,000 to ₹72,000 and payback runs 3.5 to 4.5 years, provided your monthly bill is above ₹4,000 so the generation is actually consumed rather than exported.
Is a 10kW solar system worth it in Delhi?
Only if your monthly bill exceeds ₹9,000, you have 800 to 1,000 sqft of shadow-free roof, and your sanctioned load is roughly 11 kW or more under DERC’s 90 percent rule. Net cost is ₹3,25,000 to ₹4,10,000 after the same ₹78,000 subsidy a 3 kW gets. Generation of 1,200 to 1,600 kWh per month saves ₹9,000 to ₹12,800 monthly at the ₹7.50 to ₹8.00 slab, paying back in 3.5 to 4.5 years.
Does the PM Suryaghar subsidy increase for 5kW or 10kW systems?
No. The subsidy caps at ₹78,000 for any individual residential system of 3 kW or above, per the MNRE 2026 schedule: ₹30,000 for the first kW, ₹30,000 for the second, and ₹18,000 for the third. A 5 kW and a 10 kW system receive the same ₹78,000 as a 3 kW. Housing society common-area systems use a separate ₹18,000 per kW slab.
Which is better for a 3 BHK in Delhi, 3kW or 5kW?
For a 3 BHK with one AC and a bill of ₹2,000 to ₹4,000, 3 kW is the better buy: full ₹78,000 subsidy, ₹1,20,000 to ₹1,55,000 net, and 60 to 80 percent bill coverage. Choose 5 kW if your bill consistently exceeds ₹4,000 or you run two ACs through Delhi summers. Oversizing a low-consumption home stretches payback because surplus units export at the DERC feed-in rate of roughly ₹3.00 to ₹3.50 per kWh instead of saving ₹7 or more.
How much roof space do I need for 3kW, 5kW, and 10kW in Delhi?
Plan for roughly 100 sqft of shadow-free roof per kW in standard flat mounting: 250 to 300 sqft for 3 kW, 450 to 550 sqft for 5 kW, and 800 to 1,000 sqft for 10 kW. Water tanks, mumty rooms, dish antennas, and shadows from adjoining buildings all subtract from usable area, and Delhi’s dense colonies make shading a bigger issue than in low-rise cities.
What is the maximum solar size allowed on my Delhi connection?
Under DERC regulations, residential solar capacity cannot exceed 90 percent of your sanctioned (contracted) load. A 5 kW sanctioned load allows about 4.5 kW of solar, practically 4 kW. A 10 kW system needs roughly 11 kW of sanctioned load. If you need more, apply for a load enhancement with BSES or TPDDL first, which adds 2 to 4 weeks before the feasibility step.
How long does the subsidy take to arrive in Delhi?
From portal registration to subsidy in your bank account, expect 60 to 90 days with clean documents: 12 to 20 days for DISCOM feasibility, 1 to 5 days for installation depending on size, 15 to 25 days for inspection and net meter change, and up to 30 days for the DBT credit. RWA approvals and load enhancements can stretch the total to 100 days.
Can I get a loan for a 3kW or 5kW system in Delhi?
Yes. PM Suryaghar’s collateral-free loan window lets public sector banks finance up to ₹2 lakh at roughly 6.75 percent for residential rooftop systems. A post-subsidy 3 kW at ₹1,37,500 financed over 5 years costs about ₹2,700 per month EMI, close to the monthly bill saving, so cash flow is near neutral from month one. A 5 kW at ₹1,80,000 to ₹2,25,000 also fits inside or near the ₹2 lakh window.
