India receives an average of 5–7 kWh of solar radiation per square metre per day — one of the highest in the world. Yet only a fraction of this abundant resource is being harnessed. With rising electricity tariffs, government subsidies under PM Surya Ghar Muft Bijli Yojana, and rapidly falling panel costs, 2025 is arguably the best year ever to go solar. This comprehensive guide walks you through everything you need to know before making the switch.
What Is Rooftop Solar?
A rooftop solar system is a photovoltaic (PV) power generation setup installed on the roof of a home or building. Solar panels capture sunlight and convert it into direct current (DC) electricity. An inverter then converts this DC power into alternating current (AC) suitable for your home appliances. Any surplus electricity can be fed back to the grid or stored in batteries, depending on your system type.
The Three Types of Rooftop Solar Systems
1. On-Grid (Grid-Tied) Systems
The most popular choice in urban India. On-grid systems connect directly to the utility grid. When your panels produce more electricity than you consume, the surplus flows to the grid — and your electricity meter actually runs backwards, generating credits on your bill. This is called net metering. On-grid systems are the most cost-effective since they require no batteries.
Best for: Homes with a reliable grid connection and regular daytime consumption (offices, schools, factories).
2. Off-Grid Systems
Completely independent of the utility grid. Off-grid systems store all generated electricity in a battery bank for use whenever needed — day or night. They cost significantly more due to battery costs but are ideal for areas with frequent or long power cuts, or for remote locations without grid access.
Best for: Rural homes, farmhouses, remote areas with unreliable or no grid supply.
3. Hybrid Systems
The best of both worlds. Hybrid systems are grid-connected but also include a battery bank. They use solar power first, store excess in batteries, and draw from the grid only as a last resort. When the grid goes down, the battery seamlessly provides backup power.
Best for: Homes in areas with partial grid outages that want maximum energy independence.
How Much Does Rooftop Solar Cost in India?
Solar costs have fallen dramatically over the past decade. Here is a realistic breakdown for a typical on-grid rooftop installation in 2025:
| System Size | Typical Monthly Units | Gross Cost (₹) | After PM Surya Ghar Subsidy | Area Required |
|---|---|---|---|---|
| 1 kW | 90–120 units | ₹60,000–₹75,000 | ₹21,000–₹36,000 | 10 sq ft |
| 2 kW | 180–240 units | ₹1,10,000–₹1,40,000 | ₹50,000–₹80,000 | 20 sq ft |
| 3 kW | 270–360 units | ₹1,60,000–₹2,00,000 | ₹82,000–₹1,22,000 | 30 sq ft |
| 5 kW | 450–600 units | ₹2,50,000–₹3,20,000 | ₹1,72,000–₹2,42,000 | 50 sq ft |
| 10 kW | 900–1200 units | ₹4,50,000–₹5,80,000 | ₹3,72,000–₹5,02,000 | 100 sq ft |
Costs include panels, inverter, mounting structure, wiring, and installation. Prices vary based on panel brand (monocrystalline vs. polycrystalline), inverter type, and location. Rajasthan, Gujarat, and Maharashtra have competitive installer markets that keep prices in check.
PM Surya Ghar Muft Bijli Yojana — Government Subsidy in 2025
Launched in February 2024, PM Surya Ghar is the most generous residential solar subsidy scheme India has ever offered. The scheme aims to install rooftop solar on 1 crore homes by 2027. Here is how the subsidy works:
PM Surya Ghar Subsidy Structure (Residential, 2025)
- Up to 2 kW: ₹30,000 per kW (i.e., ₹60,000 for 2 kW)
- 2 kW to 3 kW: ₹18,000 per kW for the additional capacity
- Above 3 kW: Fixed subsidy of ₹78,000 (no additional subsidy above 3 kW)
- Available only for residential consumers with a single electricity connection
- Must apply through the national portal: pmsuryaghar.gov.in
- Subsidy is disbursed directly to your bank account after installation and inspection
State governments often layer additional subsidies on top of the central subsidy. Rajasthan, for instance, offers an additional ₹10,000 per kW for systems up to 3 kW under the Rajasthan Mukhyamantri Solar Yojana. Always check your state DISCOM's website for the latest state-level incentives.
"The combination of PM Surya Ghar and net metering has made rooftop solar the single best household investment in India today — better returns than most fixed deposits over 25 years."
The Installation Process — Step by Step
Understanding what happens from enquiry to commissioning helps set realistic expectations. Here is the typical journey:
- Site Survey (Day 1): A solar engineer visits your home to assess roof orientation, shading from trees or adjacent buildings, structural strength, electrical load, and grid connection point. This is usually free.
- System Design & Proposal (Day 2–5): Based on your monthly electricity bill and available roof area, the installer designs an optimal system — panel count, inverter capacity, and wiring layout. You receive a detailed quotation.
- Application for Net Metering (Day 5–15): Your installer submits an application to your DISCOM (Jaipur Vidyut Vitran Nigam in Rajasthan) for net metering approval. In most states, approval takes 7–30 days.
- Subsidy Application (Simultaneous): Your installer helps you register on the PM Surya Ghar portal and submit documents (electricity bill, Aadhaar, bank account details).
- Installation (Day 15–25): Physical installation typically takes 1–3 days for residential systems. The mounting structure goes up first, followed by panels, inverter wiring, and AC connection.
- Inspection & Commissioning (Day 25–45): DISCOM engineers inspect the installation and replace your existing meter with a bidirectional net meter. Your system goes live.
- Subsidy Disbursement (60–90 days post-commissioning): After the system is commissioned and verified, the subsidy amount is transferred directly to your bank account.
Net Metering — Selling Surplus Power Back to the Grid
Net metering is what makes on-grid solar truly economical. With net metering, your electricity meter tracks both the units you draw from the grid and the units you export. At the end of each billing cycle, you pay only for the net units consumed (imported minus exported).
For example, if your solar system generates 400 units in a month and your home consumes 350 units from the grid, your net bill is calculated on just 350 – 400 = -50 units (a credit of 50 units carried forward to the next month). Jaipur's current export tariff is approximately ₹2.50–3.50 per unit under net metering, while the retail import tariff is ₹6–8 per unit. This means you save far more by self-consuming solar power than by exporting it.
Key Benefits of Rooftop Solar
- Electricity bill reduction: Most households see 70–100% reduction in their electricity bills within the first month of commissioning.
- Hedge against tariff hikes: Electricity tariffs in India have historically risen 5–7% per year. Solar locks in your energy cost for 25 years.
- Government subsidies: Up to ₹78,000 off the installation cost under PM Surya Ghar.
- Increased property value: Studies show solar-equipped homes command a 3–5% premium in resale value.
- Environmental impact: A 5 kW system offsets approximately 6–7 tonnes of CO₂ per year — equivalent to planting 300+ trees annually.
- Low maintenance: Solar panels have no moving parts. Quality panels come with 25-year performance warranties.
Solar Panel Maintenance Tips
Rooftop solar requires minimal maintenance, but a little attention goes a long way in maximising output:
- Clean panels every 2–4 weeks during dry season in Rajasthan. Dust accumulation can reduce output by 15–25%. Use a soft cloth or a gentle hose — never abrasive materials.
- Monitor your inverter display daily. Most modern inverters show daily, monthly, and lifetime generation. A sudden drop in output is an early warning sign.
- Check for shading seasonally. Trees grow and new construction can cast new shadows. Trim overhanging branches.
- Annual professional inspection: Have a qualified electrician check connections, earthing, and module clamps once a year.
- Inverter replacement: String inverters typically last 10–15 years. Budget for a replacement mid-way through the system's 25-year lifespan.
Frequently Asked Questions
Will solar work during monsoon or cloudy days?
Yes — solar panels generate electricity even under diffused light, though output is reduced to 10–25% of peak capacity on heavily overcast days. Jaipur enjoys 300+ sunny days annually, so seasonal variation is manageable. Your on-grid system seamlessly draws from the grid on cloudy days.
What happens during a power cut?
Standard on-grid systems automatically shut down during a grid outage — a safety requirement to protect linemen working on the grid. If power backup during outages is important to you, choose a hybrid system with a battery bank.
How long do solar panels last?
Quality solar panels (Tier-1 brands like Longi, Jinko, Waaree, Adani Solar) come with a 25-year linear performance warranty guaranteeing at least 80% of original output at year 25. Physical lifespan is often 30–35 years.
Is my roof strong enough?
Most Indian concrete or RCC roofs easily support the weight of solar panels, which is approximately 12–15 kg per panel. Older homes with flat asbestos or GI sheet roofs may need a structural assessment. A site survey by a qualified engineer will confirm suitability.
Can I expand my system later?
Yes. Most inverters support future capacity expansion. However, DISCOM net metering limits typically cap residential systems at the sanctioned load on your electricity connection. Check your electricity connection's sanctioned load before designing an expandable system.
Choosing the Right Installer
The quality of your installer is as important as the quality of your panels. Here is what to look for:
- Empanelled with MNRE (Ministry of New and Renewable Energy) — this is mandatory for PM Surya Ghar subsidy
- Provides a detailed written quotation with brand names, model numbers, and warranty terms for all components
- References from at least 10–15 local installations you can visit or call
- Offers a minimum 5-year workmanship warranty on the installation
- Handles the net metering application and DISCOM coordination on your behalf
FGPS Solar is MNRE-empanelled and has installed over 500+ rooftop systems across Rajasthan. Every installation includes a 5-year workmanship warranty, 24/7 monitoring, and end-to-end DISCOM coordination.
