Question 1

What is a solar rooftop system and how does it work?

Accepted Answer

A solar rooftop system is a renewable-energy setup installed on your home or building roof that converts sunlight into electricity using photovoltaic (PV) panels. The DC power generated by solar panels is converted into usable AC electricity through a solar inverter. This electricity powers your home appliances, reducing reliance on grid supply. Excess power is exported to the grid through net metering. Solar rooftop systems help lower electricity bills, reduce carbon footprint, and offer long-term financial savings.

Question 2

How do I calculate the right solar panel size for my home in India?

Accepted Answer

The ideal solar size is calculated based on: monthly electricity consumption, available roof area, sanctioned load, and solar irradiation in your city. A quick and accurate way to determine this is by using an India Solar Calculator that suggests the recommended solar size in kW, expected cost, subsidy, savings, and payback period. Our calculator uses real tariff data and location-specific irradiance to give you precise estimates.

Question 3

How much rooftop area is required for solar installation?

Accepted Answer

Generally, 1 kW of solar panels needs 80–100 sq ft of shadow-free rooftop space. For larger systems like 5 kW or 10 kW, both area and structural strength must be evaluated. East-west mounting requires more area but gives more uniform generation throughout the day.

Question 4

Can I install solar without batteries?

Accepted Answer

Yes, most homes choose on-grid solar (without batteries) because it is cheaper, more efficient, eligible for subsidies, and integrated with net metering. Batteries are only recommended for areas with frequent power cuts. On-grid systems are the most economical choice for urban and suburban homes.

Question 5

How does a solar inverter work in a rooftop system?

Accepted Answer

A solar inverter converts DC power from solar panels into AC power used in homes. Smart inverters also sync with the grid, monitor generation, and provide real-time data on mobile apps. Inverters play a crucial role in system efficiency and safety. Choose quality inverters with good warranty coverage.

Question 6

Does solar work during cloudy or rainy days?

Accepted Answer

Yes, but with reduced efficiency. Solar panels still generate electricity from diffused sunlight—typically 20–40% of normal output during cloudy weather. Annual generation calculations account for monsoon seasons, so your savings estimates already factor in weather variations.

Question 7

What is the cost of installing a solar rooftop system in India?

Accepted Answer

As of 2025, the average solar rooftop cost in India is: ₹55,000–₹70,000/kW for 1–3 kW systems, ₹50,000–₹65,000/kW for 3–10 kW residential systems, and ₹45,000–₹60,000/kW for commercial systems (10–100 kW). Total cost depends on panel quality, inverter type, mounting structure, wiring, and state policies. Use our calculator to get an accurate estimate for your specific location and requirements.

Question 8

What is the payback period for rooftop solar in India?

Accepted Answer

Most solar rooftop systems recover their cost within 3–5 years, depending on state electricity tariffs, system size, solar subsidies, and daily consumption. With net metering and subsidy benefits, solar becomes one of the best long-term investments for Indian homeowners. After payback, you enjoy 20+ years of virtually free electricity.

Question 9

How can I find the best solar installer near me?

Accepted Answer

Choose installers who offer MNRE-approved products, clear pricing, warranty support, transparent installation timelines, and good customer reviews. Solar Sensei connects you with verified, KYC-approved installers who compete to give you the best quote. Get multiple quotes without spam calls and choose the installer that fits your needs.

Question 10

How much can I save on my electricity bill with solar?

Accepted Answer

With net metering, you can save 70–90% on your monthly electricity bills. The exact savings depend on your current bill amount, solar system size, and local electricity tariff. Our calculator provides personalized savings estimates based on your specific consumption pattern and location.

Question 11

What subsidies are available for solar rooftops under the PM Surya Ghar Yojana?

Accepted Answer

The Indian government offers subsidies to reduce the upfront solar cost: ₹30,000 per kW for systems up to 2 kW, ₹18,000 per kW for 2–3 kW capacity, and no subsidy above 3 kW. Subsidy is applicable only for residential homes, not commercial systems. Payment is transferred directly to the customer's bank account after installation and approval through the national portal.

Question 12

What is net metering and how does it reduce electricity bills?

Accepted Answer

Net metering is a billing mechanism where excess solar energy exported to the grid is credited against your electricity consumption. Your final bill becomes: Units imported from the grid minus Units exported by your solar system. This allows you to save 70–90% on electricity bills every month. Most states in India have net metering policies that make solar highly economical.

Question 13

What documents are required for solar subsidy and net metering?

Accepted Answer

Common documents include electricity bill, Aadhaar ID, property tax receipt (sometimes), bank account details, and net metering form. Your installer handles most of the application process through the national portal. The process is streamlined and typically takes 2-4 weeks for approval.

Question 14

What is the difference between on-grid, off-grid, and hybrid solar systems?

Accepted Answer

On-grid systems have no batteries and are connected to the utility grid (best ROI, eligible for subsidy). Off-grid systems work with batteries and are good for remote areas without grid access. Hybrid systems combine grid + battery for backup + savings. Most Indian homes install on-grid systems with net metering for maximum savings.

Question 15

What is the lifespan of solar panels and inverters?

Accepted Answer

Solar panels last 25–30 years with 80% efficiency warranty after 25 years. Inverters typically last 8–12 years and may need replacement once during the system lifetime. Mounting structures last 20+ years. Panels require occasional cleaning but have very low maintenance requirements.

Question 16

What is the maintenance cost of a rooftop solar system?

Accepted Answer

Annual maintenance is very low. Typical requirements include cleaning panels every 10–15 days, inverter inspection, and checking wiring and mounting structure. AMC (Annual Maintenance Contract) may cost ₹2,000–₹6,000 per year for residential systems. Most of the maintenance can be done by homeowners themselves.

Question 17

Can I install solar on a metal sheet roof?

Accepted Answer

Yes, solar panels can be safely installed on RCC roofs, tin-sheet/metal-sheet roofs, industrial sheds, and terrace roofs. Different mounting structures are used based on roof type. Professional installers ensure proper waterproofing and structural integrity.

Question 18

Do I need to change my household wiring to install solar?

Accepted Answer

No major wiring changes are required. The solar system connects near your existing distribution board (DB). Your home appliances run exactly as before. Only minor electrical work is needed to integrate the solar inverter with your home electrical system.

Question 19

Is solar safe for rooftops?

Accepted Answer

Yes. Certified installers ensure safe mounting, proper earthing, lightning protection, and no roof leakage. Solar adds value to your property and does not damage roofs when installed professionally. All components are weather-resistant and designed for 25+ years of outdoor use.

Question 20

How much electricity does 1 kW of solar generate per day?

Accepted Answer

A 1 kW solar rooftop system generates 3.5–5 units per day, depending on location (Delhi, Rajasthan, Gujarat generate more), season, and panel cleaning frequency. On a monthly basis, it produces around 100–140 units. Our calculator uses location-specific solar irradiance data to give you accurate generation estimates.

Question 21

What types of solar panels are best for Indian homes?

Accepted Answer

The most widely used solar panels in India are Mono PERC (high efficiency, good for small roofs), Half-cut mono panels, and Bifacial panels (more generation if reflective surface exists). Mono PERC is the most recommended for residential rooftops due to higher efficiency and better performance in Indian climate conditions.

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