EV charging · India
An electric car is usually the largest single load a household ever adds — often comparable to the rest of the home. The good news: you almost certainly do not need a battery, and night charging still works. The catch is the 3 kW subsidy ceiling.
Size from distance, not battery size
| Vehicle | Effect on your bill | Extra solar usually needed |
|---|---|---|
| Electric two-wheeler | Small | Often none |
| Car, light use | Noticeable | Modest |
| Car, ~1,000 km/month | Substantial | Around a kilowatt or more |
| Car, heavy daily commute | Can rival the whole house | Pushes well past 3 kW |
Last reviewed
Size from how far you drive, not from the car's battery capacity. Battery size tells you range, not consumption.
An electric two-wheeler barely registers on this calculation and often needs no change to a planned system. A car driven around a thousand kilometres a month adds something in the region of a kilowatt or more. A heavy daily commute can add a load rivalling the rest of the house.
The obvious objection is that cars are charged overnight while panels work by day. In practice, wherever net metering credits your exports, this resolves itself.
Your system exports surplus during the day, your car draws from the grid at night, and the credit offsets that later consumption on the bill. You are not literally moving your own sunlight into the car, but financially the outcome is close to it.
The arrangement only weakens where exported units are compensated at less than you pay to import. Then daylight charging becomes genuinely more valuable, because those units are self-consumed at full tariff value rather than sold cheaply and bought back dearly. That is the same asymmetry that shapes the advice in commercial rooftop solar.
This is where money gets wasted. Adding home storage in order to charge a car is usually poor value, for a straightforward reason: where net metering applies, the grid is already performing the storage function, with no capital cost and no replacement to fund in a decade.
There is also a scale mismatch worth noticing — a car's own battery is typically far larger than a normal home storage bank, so the home battery would be a small buffer feeding a big one. Storage is worth considering for outage cover, an entirely different objective, and the economics of that are in solar battery price.
Central assistance stops increasing above 3 kW, whatever your reason for wanting more. So capacity added specifically to cover car charging is generally bought at full price with no subsidy share.
This is frequently the decisive point for households with an EV, because adding a car often pushes the sensible system size past 3 kW — precisely where the marginal economics change. Those extra kilowatts can still be a good buy, since they displace units you would otherwise import at full tariff, but they deserve evaluating on their own merits. The trade-off is worked through in 3 kW vs 5 kW and the amounts in subsidy amounts.
A home charger for a car is a substantial continuous load, and adding it to existing household demand can exceed a modest sanctioned load. That may require an increase with your distribution company.
It matters twice, which is why it deserves its own heading. In many states the rooftop capacity you are permitted is itself tied to sanctioned load. So one conversation with the DISCOM settles both questions: whether your connection supports the charger, and what ceiling applies to your solar. Doing this first avoids designing a system you are not allowed to install.
You will also need the roof to hold the resulting capacity — check it against roof area needed before committing.
Two variables decide this, and they can point in opposite directions.
Where export is credited at parity, timing makes little financial difference and you should charge whenever it suits you. Where export is worth less than import, daylight charging wins clearly. But some distribution companies also offer lower rates for night charging under time-of-day tariffs, which can make overnight charging cheap regardless of solar.
Check both before assuming, because the right answer genuinely differs between states — and both can change with tariff orders.
Set the details aside for a moment. Electricity is generally much cheaper per kilometre than petrol in India even at ordinary tariffs, and a rooftop plant reduces the electricity component further. The structural appeal is that solar turns a recurring fuel expense into consumption you largely generate yourself.
Just make the comparison honestly: use your real tariff and real driving distance, and include the charger installation and any sanctioned load increase — not only the units. The method for that is in costs and payback.
Run the free home check with your current bill, then tell us your monthly driving distance so the EV load can be added to the sizing rather than bolted on afterwards. Related: units per kW · choosing an installer · system types.
Work it out from your driving rather than from the car's battery size. Estimate the units your car consumes per hundred kilometres, multiply by your monthly distance, and divide the monthly units by about 120 to get the extra capacity in kilowatts. A car driven around a thousand kilometres a month typically adds a meaningful load in the region of a kilowatt or more of additional solar, while an electric two-wheeler adds very little by comparison and often needs no change to a planned system at all. The distance you actually drive matters far more than which model you own.
Yes, in effect, wherever net metering credits your exported units. Your panels export surplus during the day and your car draws from the grid at night, and the credit offsets the later consumption on your bill. You are not literally pushing your own daytime electricity into the car, but financially the result is close to it. The arrangement only breaks down where exported units are compensated at less than the rate you pay to import, in which case charging during daylight becomes materially more valuable than charging overnight.
No, and this is a common and expensive misunderstanding. Where net metering applies, the grid already performs the storage function that would otherwise justify a battery, at no capital cost and with no replacement to fund later. Adding a home battery in order to charge a car is generally poor value, not least because a car battery is itself far larger than a typical home storage bank. Storage is worth considering for outage cover, which is a different objective entirely.
Often yes, and it is worth checking before buying either the charger or the solar system. A home charger for a car is a substantial continuous load, and adding it to an existing household demand can exceed a modest sanctioned load. This matters twice over, because in many states the rooftop solar capacity you are permitted is itself tied to the sanctioned load of your connection. Establishing the sanctioned load position first therefore settles both the charger question and the ceiling on your solar capacity in one conversation with the distribution company.
Not beyond the usual ceiling. Central assistance stops increasing above 3 kW regardless of why you want a larger system, so capacity added to cover car charging is typically bought at full price. This is often the decisive financial point for households with an electric car, because adding an EV frequently pushes the sensible system size past 3 kW. The extra kilowatts can still be worthwhile, since they displace expensive imported units, but they should be evaluated on their own merits rather than assumed to be subsidised.
Comparing running cost per kilometre, electricity is generally considerably cheaper than petrol in India even at ordinary tariffs, and solar reduces the electricity component further. The genuine benefit of pairing them is that a rooftop plant converts a recurring fuel expense into consumption you largely generate yourself, which strengthens the case for both. The comparison should be made carefully though, using your actual tariff and driving distance, and it should include the charger installation and any sanctioned load increase rather than only the units.
It depends on two things: how your exported units are compensated, and whether your state applies time-of-day tariffs. Where export is credited at parity, the timing makes little financial difference and convenience should decide. Where export is worth less than import, daylight charging is better because those units are self-consumed at full value. Some distribution companies also offer lower rates for night charging, which pulls in the opposite direction. Check both before assuming, since the answer genuinely differs between states.
