How to Read an EV Spec Sheet in India — kWh, kW, ARAI vs Real-World Range

kWh (kilowatt-hour) is the unit of energy stored in your battery pack. A Tata Nexon EV Long Range carries 40.5 kWh. A Tata Tiago EV base carries 19.2 kWh. A BYD Atto 3 carries 60.48 kWh. This is the single biggest predictor of how far the car will go on a full charge — bigger kWh means more range, all else equal.

Two numbers to watch inside kWh. The total or nominal battery capacity is what the brochure usually shows. The usable capacity is slightly lower — typically 90 to 95 percent — because the BMS keeps a buffer at the top and bottom of the pack for battery health. The Tata Nexon EV LR brochure 40.5 kWh is actually 37.7 kWh usable. Use the usable number for range maths.

Practical rule: for rough range estimation, multiply usable kWh by the consumption figure for that car class. City driving is 5 to 7 kWh per 100 km for a compact EV and 7 to 10 kWh per 100 km for an SUV. So a 37.7 kWh Nexon EV LR at 6.5 kWh per 100 km city gives about 580 km city range in theory — but ARAI and real-world numbers are far more useful for buying decisions than back-of-envelope estimates like this.

kW (kilowatt) is the power output of the electric motor. Multiply by 1.34 to convert to horsepower, though Indian brochures increasingly stick to kW. A Tata Nexon EV produces 106 kW (142 hp). The Mahindra XUV400 produces 110 kW (150 hp). The BYD Atto 3 produces 150 kW (204 hp). Higher kW means quicker 0-100 acceleration and stronger overtaking.

Two qualifiers matter. Peak kW is the maximum the motor can produce, usually for 20 to 40 seconds. Continuous kW is what it can sustain indefinitely, typically 60 to 75 percent of peak. Indian brochures usually quote peak, so factor that if you plan long highway stints where sustained power matters.

kW costs range. Hard acceleration and sustained high-speed cruising above 100 kmph pull from the pack aggressively. A Nexon EV cruised at 120 kmph for an hour can use 15 to 20 percent more energy than the same car at 90 kmph. Brochure kW is a maximum — treat it like a ceiling, not a recommended operating point.

Torque (Nm) is the turning force from the motor. Electric motors produce maximum torque from zero RPM, which is why an EV feels noticeably quicker than a petrol car of similar kW figures at city speeds. The Tata Nexon EV produces 215 Nm. The Mahindra XUV400 produces 310 Nm. The BYD Atto 3 produces 310 Nm.

Torque matters most in the first 0 to 60 kmph run — merging into traffic, taking off from a signal, overtaking at 40 kmph. Beyond 60 kmph the kW number dominates. For Indian city driving, where most of your time is spent below 60 kmph, a 215-310 Nm EV feels very strong even compared to a petrol car with a much higher kW rating.

Practical buying advice. Do not over-index on peak kW in an EV comparison if all the cars in your shortlist have comparable torque. A 106 kW 215 Nm Nexon EV and a 110 kW 310 Nm XUV400 feel very different in traffic even though the kW figures are similar — the XUV400 is the stronger-feeling car at the usual Indian city speeds.

Indian EV brochures almost always quote ARAI range — certified by the Automotive Research Association of India on the Modified Indian Driving Cycle (MIDC). This cycle was designed for petrol and diesel fuel-economy testing in the 1990s. It runs at an average speed of about 27 kmph, with frequent stops, no air-conditioning and a mild ambient temperature. Modern Indian highway driving looks nothing like this.

As a result, ARAI figures overstate real-world range by 25 to 35 percent for most Indian EVs. A Tata Nexon EV LR with a 465 km ARAI range delivers about 300 to 350 km in real mixed Indian use with AC on. A MG ZS EV with 461 km ARAI delivers about 320 to 370 km real. The multiplier sits at roughly 0.70 to 0.75.

International cycles give better ranges. WLTP (used in Europe on some Indian-spec brochures like the BYD Atto 3) is closer to real world but still 10 to 15 percent optimistic for Indian highway speeds. EPA (United States) is usually the closest to real-world but not quoted on Indian brochures.

All Indian EVs use the IEC 62196 Type 2 socket for AC charging, which is the European standard adopted by India from 2022 onwards. Every AC home wall-box in India and every public AC charger uses this connector. No adaptor concerns as long as you stay with Indian-spec vehicles.

AC charging power in India comes in three common grades. 3.3 kW — a standard 15A domestic circuit. 7.2 kW — a dedicated 32A wall-box that needs a licensed electrician to install. 11 or 22 kW — rare at home, common at public malls and offices; requires three-phase supply.

AC charge times in the brochure are usually given as 0-100 percent or 10-100 percent at the car's peak AC rate. The Tata Nexon EV LR charges 10-100 percent in about 6 hours at 7.2 kW AC. The Mahindra XUV400 takes about 6.5 hours. The Tata Tiago EV takes about 3.6 hours because of its smaller pack.

Practical point: if you have a 7.2 kW home wall-box and you plug in after work at 8 PM with 25 percent SoC, you will be at 80 percent (the recommended daily ceiling for NMC) by around midnight or 1 AM on every Indian EV in the compact and mid-size category. Daily charging is almost never a problem with a proper wall-box.

DC fast charging in India uses the CCS2 (Combined Charging System Type 2) connector, which is the standard on all modern Indian EVs from 2022 onwards. Older Tata Nexon EVs before the 2022 refresh used CCS2 Combo 2 — functionally the same family. No cross-brand concerns for today's EVs.

DC fast charging is always quoted as the 10-80 percent time in minutes, at the car's peak DC rate. The peak rate and the time-to-80 varies sharply across the Indian EV line-up.

Two brochure traps. First, the peak DC rate on the brochure is only achievable at a fast charger that supports that rate or higher — a 50 kW Nexon EV at a 25 kW station will take twice as long. Second, the quoted time assumes a warm-but-not-hot pack at around 25 to 30 degrees Celsius. A hot summer pack at 45 degrees can take 20 to 30 percent longer because the BMS throttles the input to protect the pack. For more on why, see our guide on protecting EV lithium battery health in Indian heat.

Most Indian EVs offer Eco, City and Sport drive modes. Eco caps throttle response and heating/cooling effort to stretch range — typical range gain 8 to 15 percent on long drives. City is a balanced default. Sport releases full motor output for punchy response — typical range cost 5 to 10 percent versus City.

Regen (regenerative braking) is how the EV captures energy when slowing down and feeds it back into the pack. Tata cars typically offer 4 regen levels. MG and Mahindra offer 3. BYD offers 2. Higher regen levels recover more energy in stop-go traffic and mountain descents; lower regen levels feel more like a conventional car when cruising.

Practical setup. Most Indian owners use City mode with mid regen (level 2 of 4) as a daily driver, and switch to Eco mode plus max regen on highway trips where range matters. Do not over-index on Sport mode features in the brochure — it exists but you will rarely use it once the novelty wears off.

Heating cost. Indian brochures rarely quote heater-on range, but cold-morning North Indian driving with the cabin heater on can cost 10 to 15 percent of range. If you are in Delhi, Chandigarh, Jaipur or Lucknow, mentally discount a further 5-10 percent off the range number for December to February.

Spare wheel. Almost no Indian EV comes with a spare wheel to save space for the battery pack. Most ship with a tyre repair kit and a compressor. Factor this into your trip planning — a puncture in remote Rajasthan or Uttarakhand is harder with a kit than with a full spare, especially on tyres larger than 16 inches.

Infotainment age. The 10-inch touchscreen looks impressive in the showroom. The chip running it typically goes out of date in 3 to 4 years. This is not unique to EVs but it matters more because everything — charging, range, climate control — runs through the screen.

Over-the-air updates. The brochure advertising phrase 'OTA updates' means the manufacturer can push software improvements. In practice, Indian EV OTA cadence is 1 to 3 updates per year, not monthly like premium imports. Manage expectations on software improvements post-purchase. To cross-check the broader history of any specific EV you are considering, our guide to verifying a used car's history covers the service and ownership side that matters as much as the brochure.

After-sales network depth. The brochure counts touch-points. Ask at the showroom how many of those touch-points actually stock spare HV modules. For a BYD Atto 3 in Chandigarh or a Hyundai Kona Electric in Bhopal, the answer may be 'our nearest EV-trained centre is 200 km away'. Plan accordingly.