This guide is for a private home with an EV. Public charging stations and commercial charging businesses need a different connection, tariff, safety and project review.
Calculate the EV energy need first
Use the car maker’s tested or real-world energy figure where possible. The simple calculation is:
For example, 40 km a day at 15 kWh per 100 km equals 6 kWh. If you add a 15% planning margin, the energy to supply is about 6.9 kWh. This does not mean the roof must make 6.9 kWh every day. Monsoon clouds, shade, heat, battery state, charging limits and the time the car is parked all change the result.
How much rooftop solar might cover it?
SolarCost’s home generation guide uses about 1,300 to 1,600 units a year for a well-sited 1 kW system in India. That is roughly 3.6 to 4.4 units a day only when averaged across the year. It is not a daily promise.
| Illustrative PV size | Annual generation range | What it says about the EV |
|---|---|---|
| 2 kW | 2,600 to 3,200 units | May cover a modest daily commute on an annual energy basis, but not every charging day |
| 3 kW | 3,900 to 4,800 units | Gives more room for home use and EV charging, subject to roof and connection |
| 5 kW | 6,500 to 8,000 units | May suit a larger home load and regular EV use, but needs a bigger roof and budget |
Size the system from the whole home, not the car alone. The home solar calculator can give a first residential estimate, while the home cost guide explains what a rooftop quote includes.
Charge from solar when the car is home
| Charging pattern | Solar fit | What you still need |
|---|---|---|
| Car parked at home in the day | Direct solar can serve part of the charging load | Charger control, safe wiring and grid fallback |
| Car returns in the evening | Solar can reduce the day’s home bill, but not direct night charging | Grid charging or a battery |
| Unpredictable travel | Solar offsets some annual energy | A reliable grid or public charging backup |
| Power cuts during charging | On-grid solar normally stops during an outage | Backup-capable design and a battery if the car must charge then |
Do not buy a battery only because the word “solar” appears in the proposal. Compare the extra battery cost with the value of shifting EV charging away from grid hours. The battery guide explains usable kWh, power and safety.
Break the setup cost into parts
- AC or DC home charger that matches the vehicle and use
- Dedicated cable, breaker, earthing, surge protection and isolation
- Rooftop solar modules, inverter and structure
- Roof strengthening or longer cable routes where needed
- Battery and hybrid inverter only if later charging or backup needs justify it
- DISCOM load change, meter or other local work if required
The PV part of a standard home on-grid system is often planned at about ₹60,000 to ₹80,000 per kW before any eligible subsidy. A charger, its protection and any battery sit outside that simple PV range. Ask the vendor to show them separately.
Charging energy is not the same as charging power. A 7 kW charger can fill a car faster, but it creates a larger instantaneous load than a lower-power charger. Check the sanctioned load and the home wiring before installation.
Check the home connection and safety route
Ministry of Power guidance says residential owners may use an existing electricity connection for EV charging or seek a separate metered connection with a dedicated EV charging tariff. The live DISCOM process decides the form, load and charges for your home.
Use a qualified electrician and equipment that follows the applicable Indian charging and electrical safety standards. Keep the charger dry, protected from vehicle impact and close enough to the parking position. Do not run a high-current charger through an ordinary extension board.
For rooftop solar, follow the normal installation and handover checklist. A PV system that shuts down in an outage is working as designed unless backup was specified.
What subsidy does and does not cover
PM Surya Ghar central assistance is tied to eligible residential rooftop solar module capacity and its scheme conditions. A home EV charger or a separate EV battery does not automatically add to the amount. Check the live portal and the current DISCOM route before including a subsidy in your budget.
Read the application guide for the residential process. Do not use an EV seller’s subsidy promise as a substitute for the official scheme.
Questions to ask before you install
- What is the car’s real energy use and daily distance?
- When will the car be parked at home?
- What charger power does the vehicle support?
- Can the current sanctioned load and wiring carry that charger?
- Will the solar inverter export, limit or divert power during charging?
- What happens to charging during an outage or cloudy week?
- What work, warranty and service does each quote include?
Frequently asked questions
How much solar is needed to charge an EV at home?
Start with the car’s energy use and daily distance. If an EV uses 15 kWh per 100 km and travels 40 km a day, it needs about 6 kWh before charging losses. Add a margin and compare that need with daytime solar production.
What is the cost of solar EV charging at home?
The cost has separate parts: charger, wiring and protection, rooftop solar, structure, installation and possibly a battery. Use the current home solar cost guide for the PV part, then get a charger and electrical quote for your car and connection.
Can rooftop solar charge an EV at night?
Panels do not make power at night. You can charge from the grid, add a compatible battery or schedule charging when the car is at home during daylight. A battery adds cost and losses, so it is not needed for every home.
Can I use my existing home electricity connection for EV charging?
The Ministry of Power’s 2024 guidance says residential owners may use an existing connection or seek a separate metered connection with a dedicated EV charging tariff. Ask your DISCOM about the current process and load.
Does PM Surya Ghar subsidy cover EV charging?
The central support is calculated from eligible solar module capacity under the residential rooftop scheme. Do not assume the charger or a separate EV battery gets an extra subsidy. Check the live scheme and DISCOM conditions.
Is solar EV charging free?
No. Solar has an upfront system cost, cleaning, repairs, inverter replacement and grid charges. Charging can reduce the energy bought from the grid, but the result depends on when you charge, export rules and system performance.
Do I need a battery for solar EV charging?
No, not if you can charge in the daytime or use the grid at night. A battery helps shift solar energy to later hours and provide backup, but it increases cost, space, safety and replacement needs.
Official sources
Charger rules, tariffs, vehicle performance and solar prices change. Confirm the live connection route and equipment specification before work starts.
About the editorial team
The SolarCost.in Editorial Team checks official rules, public data, calculations, source dates and plain language. The team is independent of installers, vendors and lenders. It does not install solar or sell customer leads, and it does not provide engineering, legal or financial advice. Read our editorial policy or report a correction.