How to Install Solar Panels at Home in India

Start by analysing your monthly electricity consumption. Check your last 12 months of electricity bills to find the average monthly units (kWh) consumed. A typical Indian household consumes 200-500 units per month. One kilowatt (kW) of solar panels generates approximately 4-5 units per day in most Indian cities (equivalent to 120-150 units per month). So a 3kW system generates 360-450 units per month, enough for most households. Assess your roof: you need approximately 100 sq ft of shadow-free roof area per kW of solar capacity. A 3kW system needs about 300 sq ft. The roof should face south or south-west for maximum generation in India. East-west facing roofs get 10-15% less generation. Flat RCC roofs are ideal — solar panels are mounted on tilted frames (15-25 degree angle based on your latitude). For tiled or sloped roofs, mounting systems are available but cost 10-20% more. Ensure the roof is structurally sound and has no shading from adjacent buildings, trees, or water tanks during 9am-4pm.

Three types of solar systems: Grid-tied (on-grid): connected to the electricity grid. Excess power is exported to the grid, and you get credit through net metering. Cheapest option. No battery needed. But does not work during power cuts. This is the most popular type for Indian homes. Grid-tied with battery backup (hybrid): connected to the grid with a battery bank for power backup during outages. Costs 40-60% more than pure grid-tied. Recommended if you face frequent power cuts. Off-grid: completely independent, with large battery banks. Expensive and typically used in remote areas without grid access. Government subsidy (PM Surya Ghar Muft Bijli Yojana): as of 2026, the central government offers subsidies for residential rooftop solar: ₹30,000 per kW for the first 2 kW, ₹18,000 per kW for the next 1 kW (up to 3 kW), with a maximum subsidy of ₹78,000 for a 3 kW system. The subsidy is directly credited to your bank account after installation and DISCOM inspection. Apply through the national portal at pmsuryaghar.gov.in.

Get quotations from at least 3-4 installers. Sources: MNRE-empanelled solar vendors (list on mnre.gov.in), DISCOM-approved installers in your area, AECORD platform for verified solar professionals, and recommendations from neighbours who have installed solar. A standard 3kW grid-tied residential system costs ₹1,50,000-2,00,000 before subsidy (approximately ₹50-65 per watt installed) in 2026. After government subsidy of ₹78,000, the net cost is ₹72,000-1,22,000. The quotation should include: solar panels (mono-crystalline PERC is the current standard), solar inverter (string inverter for residential), mounting structure (GI or aluminium), DC and AC wiring, earthing and lightning protection, net meter (if applicable), installation, commissioning, 5-year comprehensive warranty on installation, 10-year product warranty on inverter, and 25-year performance warranty on panels.

Net metering allows you to export excess solar power to the grid and receive credit on your electricity bill. The process: Register on your state DISCOM portal (BESCOM in Karnataka, MSEDCL in Maharashtra, TPDDL/BYPL in Delhi, etc.) for net metering. Submit documents: electricity bill copy, ID proof, property ownership proof, roof photograph, and solar system details. DISCOM issues a feasibility report and approval within 15-30 days. For PM Surya Ghar subsidy: register on pmsuryaghar.gov.in with your DISCOM consumer number, select an empanelled vendor from the portal, install the system, upload commissioning report and photographs on the portal, DISCOM inspects and approves, subsidy amount is credited to your bank account via DBT (Direct Benefit Transfer) within 30-60 days. Important: install the system only after receiving net metering approval from DISCOM — some states penalise installations done before approval.

Professional installation takes 2-3 days for a standard residential system. Day 1: mounting structure installation on the roof, panel placement and wiring. Day 2: inverter installation (usually near the main electrical panel), DC wiring from panels to inverter, AC wiring from inverter to the main distribution board, and earthing. Day 3: testing, commissioning, and net meter installation (if DISCOM has provided it). The installer should: secure all panels with proper bolt torquing, ensure no cable is exposed to weather without proper conduit, install a DC disconnect switch near the panels, install an AC disconnect switch near the inverter, provide proper earthing (minimum two earth pits), and configure the inverter for grid-tied operation. After commissioning, the installer provides: a commissioning certificate, inverter configuration report, system user manual, warranty cards, and a generation monitoring setup (most inverters come with a mobile app for real-time monitoring).

After installation, monitor daily generation through the inverter app. A 3kW system in most Indian cities should generate 10-14 units per day (300-420 units per month). If generation is consistently below 10 units per day, check for shading, dust accumulation, or inverter issues. Clean panels every 2-4 weeks (monthly in dusty areas, bi-weekly in construction areas) with plain water and a soft cloth. ROI calculation for a 3kW system in Bengaluru: Total cost after subsidy: ₹1,00,000 (approx). Monthly generation: 380 units. Monthly savings at ₹6/unit: ₹2,280. With annual 3% electricity tariff increase, annual savings Year 1: ₹27,360. The system pays for itself in approximately 3.5-4 years. Over the 25-year panel life, total savings: ₹10-12 lakh. Annual maintenance is minimal: panel cleaning, inverter inspection, and wiring check — ₹2,000-5,000 per year through an AMC (Annual Maintenance Contract). The inverter may need replacement after 10-12 years at a cost of ₹30,000-50,000.