Solar System Cost, Savings & Payback in Delhi (1kW–10kW Guide)
Electricity bills in Delhi have been rising steadily, especially for households using air-conditioners during long summer months. At the same time, government subsidies and falling solar prices have made rooftop solar a serious option for homeowners — not just an environmental choice, but a financial one.
If you are planning to install solar in Delhi but are unsure about the actual cost, realistic savings, subsidy benefits, and payback period, this guide will help you understand all of it clearly. In this post, I’ll explain how solar performs in Delhi, how much different system sizes (1kW to 10kW) cost, and whether solar truly makes financial sense for your home.
This guide focuses on grid-tied rooftop solar systems commonly installed on Delhi homes.
Does Delhi’s Climate Favour Solar?
Delhi has an extreme type of climate with hot summers, a short monsoon, pleasant autumn and spring, and cold winters. Delhi enjoys 300+ sunny days in a year with an average solar irradiance of 5.35 kWh/m²/day which is equivalent to 5.35 Peak Sun Hours a day.
Season-wise PSH in Delhi
(i) Spring (Feb-Mar): Clear skies, mild temperatures, and an average PSH >5.5 set favourable conditions for Solar to perform very efficiently.
(ii) Summer (April – June): Generally, the solar output during these months as PSH is highest. The solar panels also lose some efficiency due to high temperatures over 40°C during this period.
(iii) Monsoon (Jul to September mid): The solar panel output drops as there is a dip in the Peak Sun Hours due to clouds and rain. However, the average remains above 5, (4.9+4.92+5.43)/3, and overall output remains strong with the latest technology solar panels.
(iv) Autumn (Oct – Nov): Pleasant weather, clear skies, mild temperatures, and average PSH > 5, making excellent conditions for solar. The solar panel efficiency improves in mild temperatures.
(v) Winter (Dec – Jan): Shorter days and a dip in peak sun hours (average of 4) affect the solar panels’ output, but still contribute steadily.
Overall, Delhi’s climate strongly favors solar energy, with an annual generation of 1,500–1,600 units per kW of installed capacity.
The temperature, relative humidity, and wind speed in Delhi
| Parameter | Average | Maximum | Source Reference |
| Temperature (°C) | 31.4 (annual mean daily max) | 47.2 (all-time station high) | IMD 1991–2020 normals & extremes via Wikipedia |
| Relative Humidity (%) | ≈49 (annual at 17:30 IST) | ≈68 (monsoon‐season peak) | IMD Delhi Weatherbox via Wikipedia |
| Wind Speed (km/h) | 10–15 (annual mean surface) | 96 (observed gust, June 1, 2025) at Palam around 4:30 pm | TOI storm report June 2025 |
Infographic:
Also, Delhi has high dust and particulate matter (like crop burning residue, vehicle emissions, construction dust, etc) in the air. This dust on the solar panels can reduce the performance by 5-20% if not cleaned regularly and properly.
Best Solar Panel for Delhi’s Climate: Technology and Features
The solar panels’ features and technology must be such that they perform efficiently in Delhi’s environment.
| Delhi Climate Factor | Local Reality | Panel Technology Recommendation | Why It Matters |
| High Temperature | Summer max air temp ~47 °C; solar cell temperature can reach 65–70 °C | TOPCon / HJT / n-Type mono (temp coeff ≈ −0.30 %/°C or better) | Lower power loss under heat compared to PERC (~−0.35 to −0.40 %/°C). Keeps summer output higher. |
| High Humidity (Monsoon) | Seasonal RH monthly average up to 68% avg and 80%+ on peak days. | Modules with IEC 62804 certification (PID-resistance + quality encapsulant) | High humidity + voltage stress → leakage current → PID risk. Certified PID-resistant panels are safer. |
| Heavy Rain & Dust | Monsoon rains, dust storms are common | Glass-glass encapsulant (bifacial or mono-facial) OR high-seal glass-back sheet | Glass-glass offers better moisture protection and durability; it reduces microcracks from storms. |
| Wind Gusts / Load | Gusts up to ~96 km/h observed; IS 875 design rule = 169 km/h | Wind load rating ≥3800 Pa (front & back) | Ensures stability on Delhi rooftops, especially in edges/corners or high-rise apartments. |
| Dust & Pollution | NCR has high particulate levels year-round | Hydrophobic/anti-soiling coated panels (optional premium) | Reduces dust adhesion, easier cleaning, and keeps PR higher between washes. |
| Salt Mist / Corrosion | Inland city, not coastal less susceptible to corrosion. | IEC 61701 Severity 1 minimum (basic salt mist test) | Not a marine climate, so Severity 1 is enough; focus more on dust than salt. |
*IS 875 (Design wind speed) = Delhi’s basic wind speed is 169 km/h (50-year period storm data) for structural design in the worst-case scenario.
In short, for Delhi’s climate, the Topcon/HJT/n-type solar panels with glass-glass encapsulant, PID-resistant, wind load rating >3800Pa, temperature coefficient of power <0.34%/°C, and lower degradation rate are the right choice.
Cost of Solar in Delhi: 1kW-10kW (Total cost, subsidy and per kW cost break-up),
The cost of a solar system in Delhi is influenced by the quality of the components (like solar panels, inverter, BoS, etc) used in the system, installation cost, transportation, and the government subsidy.
Let me share with you the per kW Solar cost break with HJT/n-Type TOPCon modules for Delhi in 2025:
| Component | Estimated Cost (₹/kW) | Remarks |
| HJT / n-Type TOPCon Modules | ₹40,000 | Premium module technology: 25–30% higher cost than standard panels. Estimated from ₹30,000–₹40,000 module range. |
| Solar Inverter | ₹13,000 | String inverter; similar to standard systems. |
| Mounting & Structure | ₹13,000 | Flat/sloped rooftop variation. |
| Wiring & Accessories | ₹11,000 | Includes BOS items like cables, junction boxes, and protections. |
| Labor & Installation | ₹15,000 | Higher for complex roofs or premium mounting. |
| Total (Pre-Subsidy) | ₹92,000 | Depends on quality and complexity; matches high-end Delhi pricing. |
- If a homeowner goes for a Mono-PERC half-cut solar cell technology, then the per kW cost (pre-subsidy) is ≈ ₹78,000.
- The HJT/TopCon/n-type technology falls in the upper range. So, the overall cost of the system increases 10-15%.
Per kW cost of Solar
Delhi follows the following subsidy structure for grid-tied solar:
- ₹30,000 subsidy for 1 kW Solar
- ₹60,000 subsidy for 2kW Solar
- Subsidy of ₹78,000 for 3kW and higher
Therefore, the effective per kW cost (post-subsidy) is as follows:
- ₹48,000 (for Mono-PERC)
- ₹62,000 (n-type/HJT/TopCon)
Per kW Solar Price Trend since 2020
Cost of Grid-tied Solar in Delhi (1kW, 2kW, 3kW, 5kW and 10kW)
| System Size | Avg. cost using Mono PERC (₹) | Avg. cost using n-Type/TOPCon / HJT (₹) | Subsidy (₹) | Net avg. cost using – Mono PERC (₹) | Net avg. cost using– TOPCon/HJT (₹) |
| 1 kW | 78,000 | 92,000 | 30,000 | 48,000 | 62,000 |
| 2 kW | 1,55,000 | 1,85,000 | 60,000 | 95,000 (47500/kW) | 1,22,000 (61,000/kW) |
| 3 kW | 2,30,000 | 2,80,000 | 78,000 | 1,52,000 (50,700/kW) | 2,02,000 (67,300/kW) |
| 5 kW | 3,75,000 | 4,55,000 | 78,000 | 2,97,000 (59,400/kW) | 3,77,000 (75,400/kW) |
| 10 kW | 7,50,000 | 9,10,000 | 78,000 | 6,72,000 (67,200/kW) | 8,32,000 (83,200/kW) |
Energy produced per kW Solar in Delhi
The energy produced by the solar power system depends on the average PSH of the location and the system size.
Ideal case (no losses)
Annual Energy Produced = System size x Average PSH x 365 days
The Average PSH of 5.35 kWh per day, making an annual energy production of ≈ 1950 kWh per kW of installed capacity.
Real Energy Production (considering losses)
Energy Produced = System Size x Avg. PSH x Production Factor of 0.75 to 0.8. After losses, a 1kW solar power system generates 1460 to 1560 kWh/year. Production factor is assumed to be 0.8 after considering the losses in the system. These losses could be:
This is about 125 units in a month, making a daily average of 4.2 units/day.
An Example:
A 1-kW solar in Delhi can
- Run 3–4 ceiling fans + lights for 6–8 hours daily, or
- Reduce your electricity bill by ₹3,600 – ₹4,320 per year (at ₹3/unit for first 200 units in Delhi).
Annual Energy Generation Potential by Grid-tied Solar (1kW, 2kW, 3kW, 5kW and 10kW)
| System Size | Gross Generation (kWh/year, before losses) | Net Generation (kWh/year, after 75–80% PR) | Average Units per Month |
| 1 kW | ~1,900 | ~1,425 – 1,520 | ~120 |
| 2 kW | ~3,800 | ~2,850 – 3,040 | ~240 – 250 |
| 3 kW | ~5,700 | ~4,275 – 4,560 | ~360 – 380 |
| 5 kW | ~9,500 | ~7,125 – 7,600 | ~600 – 630 |
| 10 kW | ~19,000 | ~14,250 – 15,200 | ~1,200 – 1,270 |
Annual Savings from Solar in Delhi
A typical 1 kW solar system in Delhi can save a homeowner ₹3,600 – ₹4,320 annually.
Delhi’s Residential electricity charges follow the slab structure:
- 0–200 units: ₹3.00 per unit
- 201–400 units: ₹4.50 per unit
- 401–800 units: ₹6.50 per unit
- 801–1200 units: ₹7.00 per unit
- Above 1200 units: ₹8.00 per unit
Annual Savings from 1 kW, 2kW, 3kW, 5kW, and 10kW Solar in Delhi:
| System Size | Monthly Units (range) | Annual Saving Range (₹) | Average Annual Saving (₹) |
| 1 kW | 100–120 | ₹3,600 – ₹4,320 | ₹3,960 |
| 2 kW | 200–240 | ₹8,600 – ₹10,320 | ₹9,460 |
| 3 kW | 300–360 | ₹14,400 – ₹17,280 | ₹15,840 |
| 5 kW | 500–600 | ₹31,500 – ₹37,800 | ₹34,650 |
| 10 kW | 1000–1200 | ₹69,000 – ₹82,800 | ₹75,900 |
Solar Payback in Delhi
It is the time required to recover the homeowner’s investment in Solar, and it’s measured in years.
| System Size | Gross Cost (₹) | Subsidy (₹) | Net Cost (₹) | Avg. Annual Saving (₹) | Payback (Years) |
| 1 kW | 75,000 | 30,000 | 45,000 | 3,960 | ~11.4 |
| 2 kW | 1,50,000 | 60,000 | 90,000 | 9,460 | ~9.5 |
| 3 kW | 2,25,000 | 78,000 | 1,47,000 | 15,840 | ~9.3 |
| 5 kW | 3,75,000 | 78,000 | 2,97,000 | 34,650 | ~8.6 |
| 10 kW | 7,50,000 | 78,000 | 6,72,000 | 75,900 | ~8.9 |
Key takeaways:
- For 1kW: long payback > 11 years
- For 2kW and 3kW: Moderate
- 5kW and 10kW: 8-9 years of Payback
If you want to calculate the exact savings and payback for your own home, based on your electricity bill, roof area, and location, you can use my Solar Feasibility Spreadsheet (India Edition).
It helps you estimate system size, annual generation, savings, and realistic payback — before speaking to any installer.
Real Case of Solar in Delhi
Mr. Kapoor was aware of the benefits of solar and planned to secure his retirement benefits through solar. Last year, he made an informed decision and installed a 5kW grid-tied solar power system at his Delhi residence.
Since then, he has saved over ₹38,000, and his electricity bill has reduced (85%) from ₹4,000 per month to mere ₹600 per month. Mr. Kapoor’s system details are as follows:
- System Size: 5kW (grid-tied)
- Solar Panel Technology: Mono-PERC half-cut solar cell technology
- Total system cost (pre-subsidy): ₹3,70,000
- Net cost (post subsidy): ₹2,92,000
- Annual Generation: ~7300 units
- Annual Savings: ~₹38,000
- Expected Payback: ~7.7 years
Key takeaways
- The 7300 annual generation from solar is enough to offset 85% of his electricity bill ₹48,000 to just ₹7,200, saving ~₹38,000 per year.
- The Payback period is under 8 years; thereafter, the solar electricity is free for 15 to 20 years.
- Over a lifetime, his expected savings from 5kW solar would be over ₹15-20 lakhs, depending on the tariff escalation.
- In addition to the financial returns, a 5kW solar system can mitigate over 7 tonnes of CO₂ annually, contributing to a cleaner Delhi.
After 1 year of smooth functioning, Mr. Kapoor is very happy with his decision and is creating awareness among his peers to adopt solar just like him.
“Now I don’t worry about rising bills; solar has secured my retirement,” says Mr. Kapoor.
Why This Is a Good Time to Go Solar in Delhi
The current combination of government support and rising electricity prices makes rooftop solar a financially attractive option for Delhi homeowners. Subsidies help reduce the upfront cost, while gradually increasing electricity tariffs improve the long-term savings from solar. In addition, the decrease in solar prices by 90% in the last 15 years has made solar technologies like HJT, MonoPERC, TOPCon, etc, more affordable than ever.
With Delhi’s average peak sun hours of 5.3 and 330+ sunny days, a homeowner can expect an annual yield of 1500/kWh per kW, making a payback in 7-9 years. Thereafter, the homeowners can enjoy solar electricity that is free for 15-20 years, major bill savings, and reduced carbon emissions.
If you want a deeper understanding of solar system design, payback calculations, and common installer mistakes, you can explore my Solar Master Class, where I explain these concepts step by step.
FAQ
1. How much electricity does 1kW Solar generate in Delhi?
A 1 kW rooftop solar system in Delhi generates about 1,400–1,500 units annually (~120 units per month), enough to cover basic lighting and fan loads.
2. What is the cost of solar in Delhi?
A grid-tied 1 kW system costs ₹75,000–₹92,000 (pre-subsidy) depending on technology (Mono-PERC vs TOPCon/HJT). After subsidy, the effective cost drops to ₹48,000–₹62,000 per kW.
3. What subsidy is available for solar in Delhi?
Under PM Surya Ghar Yojna, homeowners get:
- ₹30,000/kW up to 2 kW
- ₹18,000/kW for the 3rd kW
- Maximum subsidy capped at ₹78,000 for systems ≥3 kW.
4. What is the Payback period for solar in Delhi?
On average, the payback period for 3kW-10kW solar systems is in the range of 8-9 years, depending on the monthly consumption and tariff slab. However, the smaller systems 1-2kW have longer payback of > 10 years.
5. How much roof space is required for solar in Delhi?
A 1kW solar system requires 80-100 square feet of shade-free area, which makes 400-500 square feet for 5kW solar power system.
6. Do solar panels work in Delhi winter and monsoon?
Yes, they do, but the output reduces due to short days during winter and cloud cover in the monsoon season. However, the annual yield is still strong, giving 1500+ kWh per kW of installed capacity.
7. Can I run ACs and other heavy electrical appliances on solar in Delhi?
Yes, 5-10kW solar power systems can easily run 2 air-conditioners along with the other loads of the house. The system should be designed considering the energy needs of the family.
8. Is net-metering available in Delhi?
Yes, BSES Rajdhani, BSES Yamuna, and Tata Power discom provide net-metering facilities to homeowners going solar in Delhi. The surplus units generated are exported to the grid through net-metering and adjusted in the monthly bill.
9. How much can I save with solar in Delhi?
The savings depend on the system size. For
- 1 kW → ₹300–350/month
- 3 kW → ₹1,200–1,400/month
- 5 kW → ₹2,600–3,000/month
- 10 kW → ₹6,000–7,000/month
10. What is the lifetime savings/benefit of installing solar in Delhi?
The savings depend on the system size. A 5kW solar system can save ₹15-20 lakh in 25 years and reduce over 7 tonnes of CO₂ emissions annually, making solar both financially and environmentally attractive.
