Everything you need to know about installing rooftop solar panels at home in India -- costs, government subsidies, electricity savings, payback period, and step-by-step installation process.
Rooftop solar has become one of the smartest financial decisions an Indian homeowner can make. With the PM Surya Ghar Muft Bijli Yojana offering substantial subsidies and electricity tariffs rising year after year, solar panels now pay for themselves in 3--5 years and then generate free electricity for another 20+ years.
This guide covers everything from costs and subsidies to installation, maintenance, and calculating your return on investment.
How Rooftop Solar Works
Solar panels on your roof convert sunlight into DC electricity. An inverter converts this to AC electricity that powers your home appliances. If you generate more than you consume, the surplus feeds back into the grid (net metering), and your electricity bill shows a credit.
A typical system includes: - Solar panels (monocrystalline or polycrystalline) - Solar inverter (string or micro-inverter) - Mounting structure (aluminium frames) - Wiring, junction boxes, and safety components - Net meter (provided by your DISCOM)
Solar Panel Cost in India 2026
| System Size | Approximate Cost (before subsidy) | Suitable For | |---|---|---| | 1 kW | Rs 55,000--70,000 | 1 BHK, low consumption | | 2 kW | Rs 1,00,000--1,30,000 | 2 BHK, moderate usage | | 3 kW | Rs 1,40,000--1,80,000 | 3 BHK, average family | | 5 kW | Rs 2,20,000--3,00,000 | Large home, high AC usage | | 10 kW | Rs 4,50,000--6,00,000 | Bungalow or small business |
Prices include panels, inverter, mounting, wiring, and basic installation. Costs vary by state, brand, and installer.
Government Subsidy: PM Surya Ghar Yojana
The PM Surya Ghar Muft Bijli Yojana provides direct subsidies to residential rooftop solar installations:
| System Size | Central Subsidy | |---|---| | Up to 2 kW | Rs 30,000 per kW (total Rs 60,000 for 2 kW) | | 2--3 kW | Rs 30,000 per kW for first 2 kW + Rs 18,000 per kW for remaining | | Above 3 kW | Capped at Rs 78,000 total |
### Effective Cost After Subsidy
| System Size | Cost Before Subsidy | Subsidy | You Pay | |---|---|---|---| | 2 kW | Rs 1,15,000 | Rs 60,000 | Rs 55,000 | | 3 kW | Rs 1,60,000 | Rs 78,000 | Rs 82,000 | | 5 kW | Rs 2,60,000 | Rs 78,000 | Rs 1,82,000 |
Some states (Gujarat, Rajasthan, Uttarakhand) offer additional state subsidies, reducing costs further.
How to Calculate Your Required System Size
Check your electricity bill for your average monthly consumption in units (kWh).
- 1 kW system generates roughly 4--5 units per day = 120--150 units/month. - Divide your monthly consumption by 130 (average) to get the approximate system size needed.
Example: If you consume 400 units/month, you need approximately a 3 kW system (400 / 130 = 3.07).
ROI and Payback Period
Let us calculate for a 3 kW system in a city with an average tariff of Rs 7 per unit:
| Parameter | Value | |---|---| | System cost after subsidy | Rs 82,000 | | Monthly generation | ~390 units | | Monthly savings | Rs 2,730 (390 x Rs 7) | | Annual savings | Rs 32,760 | | Payback period | 2.5 years | | 25-year total savings | Rs 8,19,000 | | Return on investment | ~900% over 25 years |
This makes rooftop solar one of the highest-returning investments available to Indian households. Compare this with an FD calculator -- even the best fixed deposit cannot match this return.
Step-by-Step Installation Process
### Step 1: Register on the National Portal Visit pmsuryaghar.gov.in and register with your electricity consumer number and DISCOM details.
### Step 2: Choose an Empanelled Vendor The portal lists government-approved vendors in your area. Get quotes from 2--3 vendors and compare. Check their past installations and reviews.
### Step 3: Site Survey The vendor inspects your rooftop for shade-free area, structural strength, and electrical panel compatibility. You need roughly 60--80 sq ft of shadow-free roof per kW.
### Step 4: Installation Installation takes 1--3 days for residential systems. The vendor handles panel mounting, inverter installation, and wiring.
### Step 5: Net Meter Installation Your DISCOM installs a bidirectional net meter that tracks both consumption from the grid and export to the grid.
### Step 6: Subsidy Disbursement After commissioning, upload documents on the portal. The subsidy is credited directly to your bank account within 30--60 days.
On-Grid vs Off-Grid vs Hybrid
| Type | Battery | Net Metering | Best For | |---|---|---|---| | On-Grid | No | Yes | Most homes (lowest cost) | | Off-Grid | Yes | No | Areas with frequent power cuts | | Hybrid | Yes | Yes | Power backup + grid export |
For most urban and semi-urban homes, an on-grid system is the most cost-effective because you avoid the Rs 40,000--1,50,000 cost of batteries and let the grid act as your storage.
Maintenance Requirements
Solar panels require minimal maintenance:
- Cleaning: Wash panels with water every 2--4 weeks to remove dust. Dirty panels lose 10--20% efficiency. - Inspection: Annual check of wiring, inverter, and mounting structure. - Inverter replacement: String inverters typically last 8--12 years. Budget Rs 15,000--25,000 for replacement once during the panel lifespan. - Panel warranty: Most panels carry a 25-year performance warranty guaranteeing 80%+ output at year 25.
Common Myths Debunked
"Solar doesn't work in cloudy weather." Panels produce electricity from daylight, not direct sunlight. Output drops by 20--40% on cloudy days but does not stop.
"Solar damages the roof." Proper mounting actually protects the roof area underneath from rain and heat. Aluminium frames are lightweight and corrosion-resistant.
"Solar panels need constant repairs." Panels have no moving parts. The failure rate is extremely low. Most systems run for 25+ years with only occasional cleaning.
"Net metering means the DISCOM pays you." Net metering offsets your consumption, reducing your bill. In most states, excess generation is carried forward as credit for 12 months, not paid in cash.
FAQ
Q: What is the cost of a 3 kW solar panel system for home in India? A: A 3 kW system costs approximately Rs 1,40,000--1,80,000 before subsidy. After the PM Surya Ghar subsidy of Rs 78,000, your out-of-pocket cost is roughly Rs 62,000--1,02,000.
Q: How much electricity does a 5 kW solar system generate per day? A: A 5 kW system generates approximately 20--25 units (kWh) per day in most Indian cities, or about 600--750 units per month.
Q: How long do solar panels last? A: Solar panels are warrantied for 25 years and can function for 30+ years. Performance degrades by about 0.5--0.7% per year, so at year 25, output is still around 80--85% of original capacity.
Q: Can I get a loan for solar panel installation? A: Yes. Many banks and NBFCs offer solar loans at 7--10% interest rates with repayment terms of 3--7 years. Some vendors also offer EMI options. Use our EMI calculator to plan the repayment.
Q: Is solar panel installation worth it for a rented house? A: Generally, solar is best for homeowners since the payback period is 2.5--5 years. If you are a tenant, portable solar panels or community solar programs may be alternatives, but the economics are less favourable.
This article is for educational purposes and does not constitute financial advice.