Residential Rooftop Solar in India: A Homeowner's Complete Guide

Residential rooftop solar in India typically ranges from 1kW to 10kW, costs ₹60,000–₹6,50,000 before subsidy, and pays for itself in 3–6 years. The most popular residential size is 3kW, which generates 12–15 units daily and covers a 2–3 BHK home's electricity needs. With PM Surya Ghar subsidies up to ₹78,000 and net metering in all states, going solar at home has never been more accessible.

Three system types serve residential needs differently:

On-grid (grid-tied) — Best for most homes

• Connected to DISCOM grid, earns net metering credits
• Most affordable option (no battery cost)
• Qualifies for full PM Surya Ghar subsidy
• Only limitation: shuts down during grid outages (safety requirement)

Hybrid — Best for homes with frequent power cuts

• Grid-connected with battery backup
• Provides power during outages (unlike on-grid)
• Costs 30–50% more than on-grid due to batteries
• Qualifies for partial subsidy in some states

Off-grid — Best for remote locations

• Fully independent, not connected to grid
• Requires large battery bank for nighttime power
• Most expensive option, does not qualify for subsidy
• Only necessary where grid connectivity is absent

For 90% of Indian homes, an on-grid system offers the best value. If you face daily power cuts of 2+ hours, consider a hybrid system.

Detailed comparison: On-Grid vs Off-Grid →

From decision to generating power, here is the typical timeline for a residential installation:

1. Site survey (Day 1–3): Installer visits your home, inspects roof structure, measures available space, checks shading, and assesses electrical panel capacity.
2. System design and quote (Day 3–7): Installer provides a detailed proposal with panel layout, inverter selection, expected generation, and pricing.
3. DISCOM application (Day 7–14): Installer submits net metering application to your DISCOM on your behalf.
4. Installation (Day 15–20): Physical installation takes 1–3 days for residential systems. Includes mounting structure, panels, inverter, wiring, and earthing.
5. DISCOM inspection and meter (Day 20–45): DISCOM inspects the installation, installs bi-directional meter, and commissions the system.
6. System live (Day 45–60): Your system starts generating and earning net metering credits.

Total timeline: 45–60 days from booking to going live. The installation itself takes just 1–3 days; most of the timeline is DISCOM processing.

Detailed installation process guide →

Not every roof is identical, but most Indian residential roofs work well for solar:

• Shadow-free area: You need unobstructed sunlight from 9am to 4pm on the portion of roof used for panels. Nearby buildings, trees, and water tanks can create problematic shading.
• Roof condition: The roof should be structurally sound and not due for major repairs within the next 5 years. Solar mounting adds 15–20 kg/sq metre of load.
• Orientation: South-facing roofs are ideal in India. East and west-facing roofs still work but with 10–15% lower output.
• Flat vs sloped: Both work. Flat roofs (common in India) use tilted mounting structures. Sloped roofs use flush mounts if the slope angle is suitable.

During the site survey, your installer will assess all these factors and design the optimal panel layout for your specific roof.

Full roof assessment guide →

Installing solar in apartments has unique considerations but is increasingly common:

• Housing society approval: Requires a resolution passed in a general body meeting. Most societies are receptive given the maintenance charge savings on common area electricity.
• Shared rooftop allocation: Roof space is divided among participating flat owners proportional to flat size or agreed formula.
• Individual vs common area: You can install solar for your individual flat's consumption or for the society's common area loads (lifts, water pumps, corridor lights).
• Group net metering: Some DISCOMs offer group net metering where the society installs one system and credits are distributed across participating meters.

Under PM Surya Ghar, individual flat owners in apartments are eligible for subsidy on their share of the rooftop system.

Full guide: Solar for Apartments →

If paying the full amount upfront is not convenient, several financing options make solar accessible:

• Solar loans: Banks like SBI, HDFC, and Canara Bank offer dedicated solar loans at 7–9% interest for 5–7 year tenures. EMIs are often lower than your current electricity bill.
• Installer EMI plans: Many installers partner with NBFCs to offer 0% or low-interest EMI at the point of sale.
• PM Surya Ghar subsidy: Reduces your loan principal. The subsidy is credited after installation, which you can use to prepay the loan.

A ₹1,50,000 system after subsidy (₹72,000 net) on a 5-year loan at 8% works out to roughly ₹1,460/month EMI — likely less than your current electricity bill.

Full financing guide →

Every home is different — roof size, orientation, shading, and consumption all affect the ideal system. The best way to get an accurate picture is a site survey and customised quote from a verified installer.

Solar Vipani connects you with 2–3 verified installers in your city who will assess your roof and provide detailed, comparable quotes — free and without obligation.

Get your free solar quotes →