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Your roof sets the limits of your solar system. Learn how to measure it, prepare it and get the most from it.
Image: Rooftop Photovoltaic Array Construction by Lucas Braun, CC BY-SA 3.0, via Wikimedia Commons.
Rooftop solar turns unused space above your head into a power plant. But roofs differ: some are wide open, others are crowded with tanks, dishes and stair covers; some are strong RCC slabs, others are light sheets. This guide to rooftop solar in Raipur explains how to measure your roof, what affects capacity and how to prepare it, so that your design is realistic from the start.
Quick answer: plan 10 square metres of shadow-free roof per kW, face panels south at 20 to 25 degrees, keep tanks and stair covers to the north and check that the roof is sound before you install.
| Usable shadow-free area | Approx. capacity | Panels at 540 Wp |
|---|---|---|
| 20 sq m | 2 kW | 4 |
| 30 sq m | 3 kW | 6 |
| 50 sq m | 5 kW | 10 |
| 100 sq m | 10 kW | 19 - 20 |
| Roof | Suitability | Notes |
|---|---|---|
| RCC flat roof | Excellent | Raised structure on foundations; seal against leaks |
| Metal sheet | Good if sound | Clamps or rails to purlins; check roof age |
| Tiled roof | Possible | Hook mounts to rafters |
| Asbestos cement sheet | Caution | Avoid drilling; consider replacement |
| Thatched or weak roofs | Not suitable | Strengthen or use a ground mount |
A shadow on a single panel can reduce the output of a whole string. Water tanks, dishes, parapets and nearby buildings are the usual culprits. Our guide to solar layout around water tanks shows how to avoid them, and direction and tilt explains the best angle.
The structure must be hot-dip galvanised and sized for wind load. Foundations must be sealed to prevent leaks. Earthing and surge protection protect against lightning. See solar installation in Raipur.
A large roof does not mean you need a large system. Size from twelve months of units; see solar size by electricity bill. If your roof is small, higher-wattage modules can help reach your target.
A home has a 10 m by 12 m roof with two tanks and a stair cover. Usable shadow-free area after shadow allowances is about 55 square metres, enough for 5 kW. The family uses 420 units a month, which a 3 kW system would cover, so they choose 3 kW and leave room to add capacity later. The extra roof area is not wasted; it keeps options open for an air conditioner or EV.
| Problem | Effect | Fix |
|---|---|---|
| Water tank in the middle of the roof | Shade and lost area | Shift to the north side |
| High parapet on the south side | Winter shadow on the first row | Set the array back or raise the frame |
| Old, leaking waterproofing | Leaks around foundations | Repair before installation |
| Weak or corroded purlins on a sheet roof | Risk under wind uplift | Strengthen first |
| Overgrown tree | Seasonal shade | Trim regularly |
Check whether your housing society, colony or local authority has rules on rooftop use. Most welcome solar, but apartments need formal consent. Keep fire and access paths clear and follow insurer expectations. A short conversation with your installer will clarify any local requirements.
Before you choose rooftop solar in Raipur, match your monthly units to a system size and check you have the space. These are typical figures; a survey confirms them for your roof.
| System | Roof space (shadow-free) | Monthly output (approx.) | Indicative price before subsidy |
|---|---|---|---|
| 2 kW | About 20 sq m | About 240 units | Rs 1.0 - 1.4 lakh |
| 3 kW | About 30 - 35 sq m | About 360 - 400 units | Rs 1.4 - 1.9 lakh |
| 5 kW | About 50 sq m | About 600 - 670 units | Rs 2.2 - 3.0 lakh |
Not with sealed foundations and a sound waterproofing layer; ask for a written leak warranty.
One to three days on site and one to three months overall, including approvals and the net meter.
See the rooftop layout and shade guide.
Watch our solar installation videos in Raipur.
If you are planning a project, read solar in Raipur first, then compare providers using the top 10 solar companies in Raipur shortlist method and the best solar company in Raipur scorecard. Money questions are covered under solar subsidy in Raipur and PM Surya Ghar Yojna in Raipur, delivery under solar installation in Raipur, and local conditions under solar Raipur. Gupta Agro Solar is a solar company in Raipur that will survey your roof free. You can also browse the solar blog, our solar services, the Gupta Agro Solar home page or contact us for a free survey.
About 10 square metres of shadow-free roof per kW, so 30 square metres for 3 kW and 50 for 5 kW, plus walkways.
South at about 20 to 25 degrees tilt is ideal in Raipur. East-west layouts also work.
Yes, with the right mounting and a sound roof. Asbestos cement sheets need special care.
It can. Shifting tanks to the north side or raising the structure usually solves it.
Not when installed with sealed foundations and a leak warranty.
Visit C-29, Sector 3, Devendra Nagar, Raipur, Chhattisgarh 492001, call 083051 31420 or send your details online for a free site survey and a written quotation with the subsidy worked out.
Measured shadow-free area, layout and capacity recommendation in writing.