EV Charging Standards in Southeast Asia and Hong Kong: A Practical Overview

Charging compatibility is easy to overlook early in a vehicle or infrastructure project, and expensive to fix later. Connector type, communication protocol and power level must match between vehicle and charger, and the right choice depends on where the vehicle will operate. This overview covers the standards most relevant to Southeast Asia and Hong Kong.

AC and DC charging

With AC charging, the charging equipment (often a wall box or post) supplies alternating current, and the on-board charger in the vehicle converts it to direct current for the battery. Power is limited by the on-board charger and the electrical supply, which may be single-phase or three-phase. AC charging suits overnight, workplace and destination charging.

With DC fast charging, the conversion happens inside the charging station, which delivers direct current to the battery under the control of the vehicle BMS. DC charging enables much higher power and is used on highways, at fleet depots and for opportunity charging. It depends on a robust communication link between vehicle and charger.

Type 2 and CCS2

The Type 2 connector, defined in IEC 62196-2, is the common AC connector in Europe and is widely adopted across much of Southeast Asia and in Hong Kong. CCS2 (Combined Charging System, Combo 2) adds two DC pins below the Type 2 interface, so a single vehicle inlet supports both AC and DC charging. CCS2 is widely adopted across much of the region and is a common default for new vehicle programmes and public charging networks.

CCS2 DC charging uses power-line communication over the control pilot line, following DIN 70121 and ISO 15118. In Hong Kong, many public chargers offer Type 2 for AC charging, with CCS2 and, at some sites, CHAdeMO for DC charging.

GB/T

GB/T is the national standard family of mainland China, with separate AC and DC connectors; DC GB/T charging uses CAN bus communication. Vehicles and equipment developed for the mainland Chinese market often use GB/T, and some reach Southeast Asian markets through imports. When sourcing vehicles, inlets or chargers from China for export, confirm whether the product is configured for GB/T or CCS2, as many manufacturers offer both versions.

CHAdeMO

CHAdeMO is a DC fast-charging standard developed in Japan that also uses CAN communication. It was used by a number of earlier electric vehicles, and some existing public chargers in the region still provide a CHAdeMO outlet. For new programmes it is generally regarded as a legacy standard, but site operators may wish to keep supporting it for vehicles already on the road.

Light electric vehicles

Electric motorcycles and scooters often use proprietary connectors, household sockets or battery swapping rather than the car standards above. If your project involves two- or three-wheelers, check local requirements separately.

ISO 15118 and Plug & Charge

ISO 15118 defines high-level communication between vehicle and charger. Beyond basic charging control, it enables Plug & Charge: the vehicle authenticates itself to the charger using digital certificates, so the driver does not need an app or RFID card. It also supports smart charging schedules and, in later editions, bidirectional power transfer.

Plug & Charge relies on a public key infrastructure and on agreements between vehicle makers, charge point operators and mobility service providers. Support is growing but not universal, so confirm which ISO 15118 edition and which features a charger or vehicle actually implements.

Communication between the charger and the operator backend is a separate layer, usually handled through OCPP (Open Charge Point Protocol). Most operators require OCPP support so chargers can be monitored and managed centrally.

What to check before procuring chargers or inlets

1. Target markets and connector standards: Type 2 and CCS2, GB/T, CHAdeMO or a combination
2. AC power rating and phase, matched to the local electrical supply
3. DC power, output voltage range (for example, compatibility with 400 V and 800 V vehicle architectures) and maximum current
4. Communication protocols: DIN 70121, the ISO 15118 edition, and whether Plug & Charge is supported
5. OCPP version and compatibility with your backend system
6. Ingress protection rating, operating temperature and humidity range, and corrosion resistance for coastal or tropical sites
7. Cable length, cable management and, for high-power units, cable cooling
8. Local electrical safety approvals, grid connection rules and metering requirements
9. Interoperability test records with a range of vehicles
10. Spare parts availability, firmware update policy and warranty terms

Aznet supports vehicle and infrastructure projects with charging system design, inlet and charger specification, and sourcing of charging components from Asian manufacturers. Tell us about your project through our request-for-quote form.