India's EV Charging Standards: CCS2, Bharat DC001, and the Connector Wars

India does not have a single EV charging standard. It has at least five connector types in active deployment, two overlapping DC fast charging standards, two generations of backend communication protocol, and a regulatory framework that took six years of amendments to reach something close to clarity. Navigating this landscape — as a car buyer, a charging network operator, or a fleet manager — requires understanding why it got this complicated and where it is heading.

How AIS-138 Defines India's Charging Landscape

AIS-138 — Automotive Industry Standard 138 — is the master document governing EV conductive charging in India, issued by the Bureau of Indian Standards (BIS) under the Ministry of Commerce and Industry. Unlike a guideline or recommendation, AIS-138 certification is a legal requirement: charging equipment that does not carry BIS certification under this standard cannot be legally sold or installed in India.

The standard has two parts that operate somewhat independently:

AIS-138 Part 1 governs AC conductive charging. It defines the Bharat AC001 connector (the domestic AC standard), voltage and current limits, earthing requirements, leakage current thresholds, and the IEC 61851-1 control pilot (CP) signal that manages the charging handshake between car and charger. Part 1 has been relatively stable since its initial release.

AIS-138 Part 2 governs DC fast charging. This is the more contested part — it was amended in 2022 to replace Bharat DC001 with CCS2 as the mandated standard for four-wheelers, and the transition is still working through India's installed base of charging infrastructure.

Why Bharat DC001 Was Created (And Why It Was Necessary)

India's approach to EV charging standardisation in 2018 was shaped by two constraints: cost and technology readiness. CCS2 infrastructure at that time was still maturing globally, and the equipment costs for CCS2 hardware — particularly the charger-side power electronics and the ISO 15118 communication hardware — were significantly higher than what India's nascent EV market could support at scale.

Bharat DC001 was engineered as a pragmatic solution: a DC connector standard built on existing international designs but with Indian safety certification requirements layered on top. It was designed to support up to 50 kW at a cost point accessible for the highway corridor installations that EESL and state-funded charging programs were building.

The CCS2 Transition: What Changed and What Did Not

The 2022 AIS-138 Part 2 amendment did not eliminate Bharat DC001 from Indian roads — it drew a line between market segments.

Four-wheelers (passenger cars, SUVs): CCS2 mandated for all new vehicles and all new public fast charger installations. The rationale: 4W EVs are the segment where export market compatibility matters (Indian-manufactured EVs targeting European markets need CCS2), where highway charging creates network effects, and where OEM investment in platform-level charging software is highest.

Two-wheelers and three-wheelers: Bharat DC001 (or lower-power AC variants) retained. The reasoning is purely economic: 2W/3W packs range from 2–15 kWh and charge at 5–25 kW. CCS2 hardware and the ISO 15118 communication stack add cost that is proportionally enormous for a ₹1–3 lakh vehicle. Bharat DC001 equipment at these power levels costs significantly less to manufacture and certify.

CHAdeMO: Why It Lost in India

CHAdeMO was Japan's DC fast charging standard, developed by a consortium including Toyota, Nissan, Mitsubishi, and Fuji Heavy Industries. For a period in 2018–2021, many Indian highway charging stations were built as dual-standard — carrying both a Bharat DC001 gun and a CHAdeMO gun, under the assumption that Japanese EV brands entering India would use CHAdeMO.

That assumption did not play out. Several factors combined to kill CHAdeMO in India:

OEM abandonment: Nissan — CHAdeMO's primary ambassador — began shipping new models (Ariya and successors) with CCS connectors for non-Japanese markets. No major new vehicle platform entering India uses CHAdeMO. The Leaf was the only significant CHAdeMO vehicle sold in India, and in small volumes.

Network economics: A charger with both CCS2 and CHAdeMO guns costs more to build and maintain than a CCS2-only unit. As CCS2 car volumes grew, the CHAdeMO gun was serving an increasingly marginal user base.

CharIN momentum: The CharIN consortium (which manages CCS) added major global automakers at a pace CHAdeMO's consortium could not match. By 2022, CharIN members included BMW, Daimler, Ford, General Motors, Hyundai, Stellantis, and Volkswagen Group — representing over 80% of global EV sales outside China.

BIS Certification: What It Actually Requires

BIS certification under AIS-138 is not a paper exercise. The certification process requires:

1. Type testing at a BIS-recognised laboratory — the charger unit must pass electrical safety tests including dielectric strength, earth continuity, leakage current, and short-circuit protection under AIS-138 and referenced IEC standards.
2. Communication protocol verification — the charging handshake (IEC 61851 control pilot or ISO 15118 PLC) must function correctly with a reference test vehicle.
3. Factory surveillance — BIS inspectors visit the manufacturing facility to verify production quality matches the certified prototype.
4. Licence renewal — BIS certification must be renewed periodically, with repeat testing if the design is modified.

The practical consequence: there is a meaningful lag between a new charging technology becoming technically available and BIS-certified products appearing on the Indian market. This lag was visible in the CCS2 transition — CCS2 was globally mature by 2020, but certified Indian-market CCS2 equipment took until 2022–2023 to become widely available at competitive prices.

OCPP: The Invisible Standard That Runs Every Network

Behind every charging session is a communication layer that most users never see: OCPP (Open Charge Point Protocol), the standard that connects individual charging stations to the network operator's cloud management system.

OCPP 1.6J (the JSON variant) is the working standard on most Indian charging networks today. A session at a ChargeGrid or Tata EZ Charge station involves:

• The charger sending a BootNotification when it starts up
• The user's RFID card or app triggering a RemoteStartTransaction
• The charger sending MeterValues at intervals (energy delivered, voltage, current)
• A StopTransaction message when the session ends, triggering billing

OCPP 2.0.1 — the next generation — adds device management improvements, detailed error reporting, smart charging profiles (allowing the grid operator to request a charger reduce power during peak demand), and the transaction model needed for V2G. India's transition to 2.0.1 is underway but slow: the backend software upgrades on the network operator side are significant, and most operators are running 1.6J infrastructure that works adequately for today's use cases.

The Current State: What You Will Actually Find

If you are buying or operating an EV in India today, the practical landscape is:

Home charging: Bharat AC001 wallbox (3.3 or 7.2 kW) for most Indian-made 4W EVs. Type 2 AC for premium imports. All powered by OCPP or simple dumb wallboxes for home use.

Public AC charging: Bharat AC001 bays at malls, offices, and residential societies. Predominantly 7.2 kW single-phase. Type 2 bays at premium properties targeting imported EV owners.

Highway DC fast charging: New installations are CCS2-primary. Most major networks (Tata Power EZ Charge, ChargeGrid, Statiq, BPCL Jio-bp) have transitioned to CCS2. A legacy tail of Bharat DC001 guns remains on highway routes, but numbers are declining.

2W/3W charging: Bharat DC001 at dedicated swap/fast charge stations. AC charging via proprietary or Bharat AC001 connectors at home and slow public bays.