As electricity bills go up every year, more Indian homeowners are looking up at the roof above their heads and asking, “Can this roof pay my electricity bill?” In most cases, the answer is yes, and solar panels are helping to make it happen.
India gets some of the world’s highest solar radiation, with most parts getting 4 to 7 peak sun hours/day. That’s why rooftop solar installation in India is one of the smartest home investments you can make today.
But going solar can be an overwhelming task if you don’t know where to start. How big a system do you need? How does the installation work in practice? What subsidies? This solar panel installation guide will walk you through the process in simple language so you can make the right decision for your home.
The residential solar boom in India is real, and it is gaining momentum fast. The Government of India launched the PM Surya Ghar Muft Bijli Yojana (also known as PM Surya Ghar Yojana) in February 2024 to solarise 1 crore households by 2027. Over 40 lakh applications have been registered on the national portal so far, and the figures continue to grow by early 2025.
Here’s what’s driving homeowners to switch:
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Huge savings on electricity bills — A 3 kW rooftop solar system can help you save ₹2,000 to ₹3,500 per month, depending on your location and usage.
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Government subsidy support – Under the PM Surya Ghar Yojana, you can avail of central government subsidies up to ₹78,000 for systems up to 3 kW.
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Advantages of net metering – Any surplus electricity generated by your panels can be fed back into the grid, and your electricity distributor (DISCOM) will give you credit for it in your bill.
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Rising electricity rates — Commercial electricity rates will increase 5–8% annually. Buying solar now protects you from future increases.
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Environmental impact – An average 3kW home solar system offsets around 3-4 tonnes of CO2 emissions per year.
India’s total installed rooftop solar capacity exceeded 13 GW in 2024, with residential systems being the fastest-growing segment. If your neighbours aren’t solar yet, they likely will be soon.
What factors should anyone consider during installation?
Before you call a solar installer, do a quick self-assessment: These checks will save you time and allow you to have more informed conversations with your vendors.
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Roof Space and Condition
Solar requires around 65-80 sq. ft. of roof space without shadow for every 1 kW of capacity. A 3 kW system will need approximately 200-250 sq. ft. Your roof needs to be structurally sound, and preferably newer than 10 years, or inspected recently.
Roof types that work well are:
Additional roof types for evaluation:
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Sun Direction and Shadows
The solar panels in your city in India should face south and be tilted at an angle approximately equal to your latitude. (For example 13° in Bengaluru, 28° in Delhi.) Roofs oriented east-west can work, but will produce a little less energy.
Solar output is killed by shading. Even a single shadow falling on just one panel of your system from a water tank, tree, or neighbouring building can reduce the output of your whole system. During the site survey, ask your installer to do a shadow study.
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Your monthly consumption of electric energy
Check your last 6-12 electricity bills and write down your average monthly units (kWh). This is the key number to size your system.
|
Monthly Usage |
Recommended System Size |
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Up to 150 units |
1–2 kW |
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150–300 units |
2–3 kW |
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300–500 units |
3–5 kW |
|
500+ units |
5–10 kW |
Solar Panel Installation Process
Below is the whole process of solar installation:
Step 1: Site Survey and Design (1-3 Days)
A certified solar technician visits your home to measure your roof, assess shading, examine electrical wiring, and design the right system for your needs. This is usually free of charge from reputable firms.
Step 2: Quote & Product Selection (Day 3-7)
You will get a detailed quote with the brand of the panels, type of inverter, mounting structure and the cost of the installation. Compare at least 2-3 quotes before deciding.
Important parts you will choose:
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Solar Panels – Monocrystalline panels are the most efficient and recommended for homes with limited roof area.
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Solar inverter – Converts the DC electricity from the panels into AC electricity that your home can use.
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Mounting Structure – Aluminium frames to hold your panels at the correct tilt and angle.
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Solar Battery (Optional) – Stores excess energy to use at night time or during power cuts.
Step 3: Government Approvals + DISCOM Application (Day 7-30)
For grid-connected systems (which are subsidy-eligible), your installer will submit an application to your local electricity board (DISCOM) for technical feasibility and net metering approval. This is a requirement and generally takes 2 – 4 weeks. This paperwork should be handled by your installer.
You need to register on the National Portal for Rooftop Solar (solarrooftop.gov.in) to avail the central subsidy under the PM Surya Ghar Yojana.
Step 4: Physical installation (1-2 days)
Once approvals are in place, the actual installation is surprisingly quick, typically 1 to 2 days for a standard 3–5 kW home system.
The steps are:
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Mounting structure attachment to your roof
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Solar panel installation and mounting
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Linking the panels to the inverter
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Wiring the inverter to the main electrical board in your home
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Installation of a bi-directional (net) meter (done by DISCOM).
Step 5: Inspection, Commissioning & Disbursement of Subsidy (Day 30-60)
A DISCOM official checks the system after installation. Once approved, net metering is activated, and your system is officially commissioned. The central subsidy amount is then directly transferred to your bank account, usually within 30 days of commissioning.
Common Mistakes to Avoid During Solar Installation
Even with the best of intentions, homeowners make these avoidable errors:
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Choosing the lowest-cost installer without checking credentials: Always use a vendor empanelled with MNRE (Ministry of New and Renewable Energy) or your state nodal agency. Some unlicensed installers use cheap components that only last 2-3 years.
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Shading problems are ignored: A 10% shaded panel can impact the output of your entire system by as much as 30% if you use the wrong inverter. If partial shading is unavoidable, inquire about MPPT inverters or micro-inverters.
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The system is oversized or undersized: If you consume 200 units/month, don’t install a 10 kW system. Many DISCOMs don’t allow export beyond a certain limit, and your investment will not pay back efficiently.
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Omitting the net metering application: Without net metering, you lose a huge financial benefit of being able to sell your excess electricity back to the grid.
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No questions about warranty: The good solar panels have a 25-year output warranty and a 10-year product warranty. The inverters typically have a 5-10 year warranty. Sign nothing until you get all the warranties in writing.
Cost, Subsidy & Savings of Home Solar Systems in India
The average cost of a rooftop solar system in India (before subsidy) in 2025 is:
|
System Size |
Approximate Cost (Before Subsidy) |
|
1 kW |
₹65,000 – ₹75,000 |
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2 kW |
₹1,20,000 – ₹1,40,000 |
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3 kW |
₹1,70,000 – ₹2,00,000 |
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4 kW |
₹2,70,000 – ₹3,20,000 |
PM Surya Ghar Subsidy (Central government):
|
System Size |
Central Subsidy |
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Up to 2 kW |
₹30,000 per kW |
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2 kW to 3 kW |
₹18,000 for the third kW |
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Above 3 kW |
₹78,000 |
Many states have additional subsidies in addition to the central government support. Check with your state nodal agency for the latest figures.
Conclusion
A well-installed 3 kW system in a sunny city such as Jaipur or Hyderabad can generate 350-400 units of electricity per month. At ₹8/unit average cost, that’s ₹2,800-₹3,200 monthly savings, meaning the system typically pays for itself in 4-6 years. After payback, the next 15-20 years of solar generation is essentially free electricity.
Find out your monthly electricity consumption, get your roof inspected and apply on the National Portal for Rooftop Solar to start on your subsidy journey. Always use a certified, experienced installer and don’t cheap out on panel and inverter quality – your system should last you 25 years.
Loom Solar is one of the most trusted solar brands in India if you are a homeowner looking for reliable, high-quality solar products. They offer efficient panels with technologies like Mono PERC, TOPCon, bifacial, HJT, and back contact panels in different variations and robust inverters designed for Indian climatic conditions.
