Yes, you can charge your EV with solar panels in India — and the numbers work out well. A 3kW rooftop solar system generates roughly 12–15 units (kWh) of electricity per day, which is more than enough to cover 40–50 km of daily driving for most electric cars. With the PM Surya Ghar subsidy cutting the upfront cost nearly in half, the system pays for itself in about three to four years. After that, you're essentially driving on free fuel for the next 20+ years.
This guide covers how much solar you actually need, what it costs, how the subsidy and net metering work, and what the setup involves — for both home and commercial installations.
How Much Solar Do You Need to Charge an EV?
The math is simpler than most people expect. Most EVs on Indian roads consume about 1 kWh of energy for every 7–9 km of driving. If you drive 30–40 km daily — which is the typical urban commute — you need roughly 4–5 kWh per day to replenish what you used.
In India, 1 kW of rooftop solar generates approximately 4–5 kWh per day, depending on your location, panel orientation, and season. That means even a 1.5 kW system could technically cover a 30 km daily commute. But in practice, you want headroom for cloudy days, seasonal variation, and household electricity use. A 3kW system is the sweet spot for most homes — it generates 12–15 kWh daily, which comfortably covers the car and a portion of your household electricity as well.
If you drive more than 50 km daily, or if you want the solar system to cover your entire electricity bill including the EV, a 4–5 kW system makes more sense. The good news is that the subsidy covers systems up to 10 kW, so you have room to scale.
What Does a Rooftop Solar System Cost in India?
A 3kW on-grid rooftop solar system costs approximately ₹1.6–2.15 lakh in 2026, depending on the panel quality, inverter type, and installation specifics. This includes panels, inverter, mounting structure, wiring, and installation.
Under the PM Surya Ghar Muft Bijli Yojana — the central government's rooftop solar subsidy scheme — residential consumers receive ₹30,000 per kW for the first 2 kW and ₹18,000 per kW for additional capacity up to 3 kW. For a 3kW system, the total subsidy comes to ₹78,000, transferred directly to your bank account after installation and inspection.
That brings the effective out-of-pocket cost for a 3kW system to roughly ₹82,000–1.37 lakh. For context, that's less than what many people spend on petrol in a single year. The subsidy applies only to on-grid systems installed by MNRE-approved vendors using ALMM-listed (Approved List of Models and Manufacturers) solar panels — so make sure your installer meets both criteria before signing up.
Here's the cost breakdown for common system sizes:
- 2kW system: ₹1.1–1.5 lakh before subsidy, ₹50,000–90,000 after subsidy (₹60,000 subsidy)
- 3kW system: ₹1.6–2.15 lakh before subsidy, ₹82,000–1.37 lakh after subsidy (₹78,000 subsidy)
- 5kW system: ₹2.5–3.5 lakh before subsidy, ₹1.72–2.72 lakh after subsidy (₹78,000 subsidy — capped at 3kW)
How Does Solar EV Charging Actually Work Day-to-Day?
This is where most people get confused — if solar panels generate power during the day and you charge your EV at night, how does it work?
The answer is net metering. With an on-grid solar system (the most common and cheapest option), your solar panels feed electricity into the grid during the day when the sun is out. Your electricity meter runs backward during this time, building up "credits." When you plug in your EV at night, you draw power from the grid — but you're using up the credits you banked during the day. As long as your monthly solar generation matches or exceeds your monthly consumption (including the EV), your effective electricity cost is zero or near-zero.
You don't need a battery storage system for this to work. Battery storage (making the system "hybrid" or "off-grid") adds ₹50,000–1.5 lakh to the cost and is only necessary if you want to charge during power cuts or if your area doesn't support net metering. For most Indian homes connected to the grid, an on-grid system with net metering is the simplest and most cost-effective setup.
One practical note: net metering policies vary by state. Most states now support it, but the settlement mechanism (monthly, annual, or credits versus buyback rate) differs. Check your state DISCOM's policy before installation. You can apply for net metering through the PM Surya Ghar portal at pmsuryaghar.gov.in.
What's the Real Per-Kilometre Cost of Solar EV Charging?
This is where the comparison with petrol and even grid-charged EV driving gets interesting.
Charging an EV from the grid at home costs roughly ₹1–1.5 per km depending on your domestic tariff and the car's efficiency. Charging from solar — once the system is paid off — brings this down to effectively ₹0 per km, since sunlight is free. Even during the payback period, the blended cost (solar investment amortised over 25 years of generation) works out to roughly ₹0.30–0.50 per km.
For comparison, a petrol car doing 15 km/l at ₹105/litre costs about ₹7 per km. A CNG car costs roughly ₹3–4 per km. A grid-charged EV costs ₹1–1.5 per km. A solar-charged EV, over its lifetime, costs under ₹0.50 per km. The difference compounds over years — a household driving 40 km daily saves roughly ₹50,000–60,000 per year on fuel compared to grid charging alone, and over ₹2 lakh per year compared to petrol.
What Rooftop Space and Conditions Do You Need?
A 3kW system needs approximately 250–300 square feet of shadow-free rooftop area. That's roughly the size of a large bedroom. The panels should ideally face south in India (for maximum sun exposure) and be tilted at an angle equal to your city's latitude — most installers handle this automatically.
The critical word here is "shadow-free." Even partial shading — from a water tank, a neighbouring building, a tree, or a satellite dish — can reduce generation by 20–30%. A proper site survey by the installer should include a shadow analysis at different times of day. If shading is unavoidable on part of the roof, half-cut mono PERC panels and micro-inverters can minimize the impact, though they cost slightly more.
If your roof space is limited, higher-efficiency panels (monocrystalline, 400W+) generate more power per square foot, letting you fit a 3kW system in a smaller area. The panel technology has improved significantly — a 3kW system that needed 350 square feet five years ago might now fit in 220–250 square feet with modern panels.
Do You Need to Upgrade Your Sanctioned Load?
This is an important practical consideration that many solar-EV guides skip. If your home has a 3–5 kW sanctioned load (common in Indian homes) and you install a 7kW EV charger, the total draw can exceed your sanctioned limit — especially when the charger runs simultaneously with your AC, geyser, or other heavy appliances.
With solar and net metering, the panels reduce your net draw from the grid during the day. But nighttime charging still pulls full power from the grid. If your sanctioned load is tight, you have a few options: charge during the day when solar offsets part of the load, use a lower-power charger (3.3kW portable chargers work within most sanctioned loads), or apply to your DISCOM for a load increase.
A separate meter for the EV charger is another option — it isolates the EV's consumption from your household load and may qualify for a different (sometimes lower) tariff. Some states offer time-of-day tariffs where nighttime electricity is cheaper, which pairs well with solar credits banked during the day.
What Does the Installation Process Look Like?
For a home rooftop solar system with EV charging, the setup involves two parallel tracks: the solar installation and the charger installation. Here's the typical sequence:
- Site survey: The solar installer assesses your roof — area, orientation, shading, structural condition. The electrician assesses your electrical panel for the charger — available breaker slots, earthing, cable routing.
- System design: Based on your daily driving and electricity consumption, the installer recommends a system size. For most EV owners, 3–5 kW is the range.
- DISCOM application: Apply for net metering through your state DISCOM or via the PM Surya Ghar portal. This can take 2–6 weeks depending on your state.
- Solar installation: Panel mounting, inverter installation, wiring to your distribution board. Typically takes 1–2 days for a residential system.
- Charger installation: Wall-mounted or portable charger setup with dedicated MCB, earthing, and wiring. This can happen in parallel with the solar work.
- DISCOM inspection and meter change: After installation, the DISCOM inspects the system and installs a bi-directional (net) meter. This enables the credit mechanism.
- Subsidy disbursement: After the DISCOM issues a commissioning certificate, the subsidy amount is transferred to your bank account. Timeline varies but typically takes 30–90 days.
End to end, the process takes 4–8 weeks from application to fully operational system.
Can You Use Solar for Commercial EV Charging?
Yes, and the economics are even more attractive for commercial setups because commercial electricity tariffs are higher than residential ones — often ₹8–12 per kWh versus ₹3–6 for domestic. A solar system that offsets even a portion of the electricity consumed by commercial chargers significantly improves the unit economics of each charging session.
But the real advantage for commercial operators lies in combining solar with battery energy storage systems (BESS). India's Time-of-Day (ToD) tariff framework — now mandatory for commercial and industrial consumers with demand above 10 kW — charges 10–20% more during peak hours and 10–20% less during solar hours. With battery storage, you can charge batteries during cheap solar hours (either from your panels directly or from discounted grid rates) and discharge during peak hours when grid electricity is most expensive. This shaves demand charges significantly — in some states, the monthly saving from peak demand reduction alone can justify the battery investment.
The scale of investment is different, though. A commercial solar setup (10–50 kW) with battery storage can cost ₹15–50 lakh or more depending on capacity. This isn't a simple rooftop install — it requires proper load analysis, battery sizing based on charging patterns, and integration with the CMS for intelligent charge scheduling. But for high-utilization commercial charging hubs, the combination of solar generation, battery storage, and ToD tariff arbitrage can reduce effective electricity costs by 30–50% compared to pure grid dependence.
The PM Surya Ghar subsidy is designed for residential consumers, but commercial and industrial entities can benefit from accelerated depreciation (40% in the first year) and state-level incentives that vary by location. Some states like Rajasthan offer additional exemptions on transmission and wheeling charges for BESS integrated with renewables.
Housing societies are an interesting middle ground. The PM Surya Ghar scheme offers ₹18,000 per kW for common area solar installations in group housing, which can include EV charging infrastructure. A society that installs a 10kW system on its terrace and connects it to shared EV chargers in the parking area creates a community charging facility with minimal ongoing electricity cost.
What Are the Limitations of Solar EV Charging?
Solar EV charging works well, but it's worth being realistic about the limitations — especially around economics.
- Solar generation is not consistent. Cloudy days and monsoon season reduce output by 30–60%. A system that generates 15 kWh/day in April might produce only 6–8 kWh/day in August. Net metering averages this out over the billing cycle, but if you're sizing your system tightly around your EV needs, expect shortfalls during monsoon months (July–September). Build in at least 20–30% headroom when choosing your system size.
- The payback calculation assumes consistent usage. If you work from home some days, travel frequently, or your driving pattern changes, the actual savings timeline extends. The three-to-four-year payback estimate assumes you're driving and charging daily.
- For commercial setups, don't underestimate the investment scale. A solar-only installation (without battery storage) still relies on the grid during peak hours when electricity is most expensive. Adding battery storage improves the economics significantly but raises the upfront cost from a few lakh to ₹15–50 lakh. The ROI depends heavily on your charging hub's utilization rate — a commercial setup running at 30% utilization has very different economics than one running at 70%.
- Rooftop space is a constraint in apartments and dense urban areas. If you live in a high-rise apartment, you likely don't have dedicated roof access. Ground-mounted panels require even more space.
- Net metering policies aren't uniform across India. Some states cap the system size you can install, some limit the buyback rate for excess generation, and a few still have bureaucratic delays in approvals.
- The solar system doesn't directly power your charger in real time unless it's a hybrid/off-grid setup. With standard on-grid systems, solar generation offsets grid consumption through credits — the actual electrons come from the grid.
None of these are dealbreakers for most homeowners. They're just factors to account for when sizing your system and setting expectations.
Is Solar EV Charging Worth It in India?
For homeowners with a south-facing roof and reasonable sunlight, the answer is clearly yes. A 3kW system after subsidy costs about ₹80,000–1.4 lakh, pays for itself in three to four years, and then delivers free energy for the next 20+ years. Even if you don't drive an EV yet, a rooftop solar system makes financial sense on its own — the EV just amplifies the savings.
The combination of falling solar panel prices, a generous central subsidy, mature net metering infrastructure, and rising petrol costs makes this one of the more straightforward energy investments available to Indian households today. If you're already considering an EV charger, pairing it with rooftop solar turns your daily commute into something that costs almost nothing to run.
