Rooftop solar installation process

Collect twelve months of bills

Monthly rupee spend alone can hide seasonal use and tariff slabs. Note kWh units, sanctioned load, phase, consumer category and connection name. Measure clear roof area and mark shade, water tanks and future construction.

Decide whether your goal is bill reduction, outage backup or both. This single choice separates an on-grid quote from a more expensive hybrid design.

Put the scope in writing

Compare at least three itemised quotes. For subsidy work, check the vendor’s current National Portal registration. Ask for exact module and inverter models, structure material and height, protections, cable sizes, earthing, monitoring, generation estimate, warranties and the person responsible for portal and DISCOM work.

Do not choose from payback alone. A useful proposal shows assumptions and exclusions. Link payments to visible milestones.

What to inspect on site

• Panel rows do not block drains or routine access.
• The structure is fixed and waterproofed as specified.
• Cables are supported, labelled and protected from sharp edges and sun.
• DC and AC isolators, surge protection and earthing match the design.
• The inverter has ventilation and service clearance.
• Serial numbers match the invoice and portal documents.

Only trained people should test live electrical equipment. Do not climb onto an unfinished array.

Do not finish at switch-on

Collect the invoice, layout, single-line diagram, datasheets, warranty documents, serial-number list, test report, monitoring login, maintenance instructions and emergency shutdown steps. For a grid-connected system, retain the application, inspection, commissioning and metering records.

Record a baseline generation reading. Check the maintenance schedule and warranty guide before the crew leaves.

Direction, tilt and shade need a site design

A south-facing array often supports high annual generation in India. East or west layouts can still be useful, especially when roof shape or daytime use favours them. There is no one angle for every city. Latitude, roof slope, wind, row spacing and seasonal goals affect tilt.

Ask for a measured layout showing panels, walkways, roof edges, drains, water tanks and shade. A rough 80 to 100 square feet per kW is only an early estimate. Elevated structures need a structural design for dead load and wind load. Metal sheds need suitable clamps, corrosion control and checks around roof sheets.

Waterproofing must match the roof. Penetrations should be sealed with a durable system, not only surface cement or sealant. Record the roof condition before work starts.

What happens from survey to switch-on

1. Energy review: check bills, load, phase and the purpose of solar.
2. Site survey: measure the roof, shade, cable route, inverter location and earthing points.
3. Design: fix capacity, layout, strings, structure and protection.
4. Approval: complete the scheme and DISCOM stage required before work.
5. Structure and modules: install supports, modules and bonding without blocking drainage.
6. Electrical work: route cables, install isolators, surge protection, earthing and distribution connections.
7. Testing: check polarity, insulation, earth continuity, inverter settings and shutdown.
8. Meter and inspection: complete DISCOM testing and commissioning for grid connection.
9. Handover: receive documents, monitoring and safe operating instructions.

A small home array can be physically installed in a few days. The whole project often takes longer because design, equipment delivery, portal stages, meter work and corrections sit around those site days.

Plan the official process before material arrives

For PM Surya Ghar, register and follow the portal route before installation. The August 2026 government update said deemed approval and a feasibility waiver had been introduced for rooftop systems up to 10 kW. The live portal and DISCOM still control the steps shown for your application.

A normal sequence includes rooftop application, registered vendor, compliant equipment, plant upload, net meter request, inspection, commissioning and subsidy redemption. If a vendor says paperwork can be fixed later, ask them to show the current official rule.

For commercial, industrial and larger projects, the approval path can include sanctioned load changes, electrical inspector requirements, protection studies or open access permissions. Do not copy a home checklist onto a factory project.

Safety details that should be visible

CEA regulations require suitable protection, earthing and testing for solar installations. Look for supported and labelled cables, compatible connectors, secure enclosures, isolation points, surge protection and safe inverter clearances. Lightning protection depends on the design and risk assessment.

Workers need safe roof access and fall protection. Keep children and residents away from the work area. Never test live DC wiring yourself. Solar strings remain live in daylight even when the inverter is off.

Ask the installer to demonstrate normal shutdown and emergency isolation. Keep the procedure near the main electrical board and share it with building maintenance staff.

Put responsibility and payment stages in the contract

• Exact equipment makes, models, quantities and allowed substitutions
• Measured layout and structure specification
• Generation estimate with stated losses
• Portal, DISCOM, meter and inspection responsibility
• Start date, completion stages and delay terms
• Gross price, taxes, exclusions and subsidy assumption
• Workmanship, waterproofing and service warranty
• Documents required before final payment

Keep the final payment linked to commissioning, monitoring access and documents. A system is not complete when panels reach the roof.