The difference in one minute

Smart charging is the broad control of when and how much power an EV receives. Load balancing is one smart-charging function that keeps charging within an available site or circuit limit. Vehicle-to-grid (V2G) is bidirectional: it can send energy from the vehicle battery back to the grid.

They can be combined, but one does not prove the others are available.

What is smart charging?

Smart charging, sometimes called managed charging or V1G, changes charging power or timing in response to a goal. That goal might be a departure time, electricity price, solar output or network instruction.

The energy normally moves in one direction, from the grid to the vehicle. A schedule is a simple form. Dynamic control recalculates the plan when data changes.

What is load balancing?

Load balancing manages a limited amount of power. Static load balancing divides a fixed EV capacity between chargers. Dynamic load balancing also measures other building demand and changes the EV allowance.

Its main purpose is electrical capacity management. It can help a home avoid exceeding its connection limit or allow a depot to connect more chargers without assuming that all vehicles draw full power at once. It does not send electricity out of the vehicle battery.

What is V2G?

V2G allows a compatible EV and bidirectional charger to export energy to the electricity system under an authorised service. V2H supplies a home and V2B supplies a building. All are forms of bidirectional EV charging.

V2G requires more than a smart schedule. The vehicle, charging equipment, connection, communication, controls, market arrangements and permissions must all support export. Availability differs by country, vehicle and service.

How can the three work together?

Consider a depot with 20 vans and a constrained connection. Dynamic load balancing sets the EV capacity left after building demand. The CSMS allocates that capacity according to routes and departure times. A future V2G service might discharge selected vehicles during a grid event, but only if their operational energy targets remain protected.

In that example, load balancing defines the immediate ceiling, smart charging decides how to use it, and V2G adds a possible reverse flow.

Which communication standards apply?

OCPP connects a charger to a CSMS or CPMS. OCPP 1.6 can carry charging profiles; OCPP 2.0.1 adds more smart-charging functions. OCPP 2.1 adds functions relevant to bidirectional operation. Version names do not confirm that a charger and backend implement every required function.

ISO 15118 is the EV-to-charger boundary. ISO 15118-20 includes communication for bidirectional power transfer. It does not run tariffs, a CPO portfolio or an energy market. The backend, energy systems and commercial service sit elsewhere.

What equipment does each need?

Smart charging needs a controllable vehicle or charger, a decision-making system and the data used by the rule. Load balancing additionally needs a configured electrical limit and, for dynamic control, suitable site-load measurement. V2G needs compatible bidirectional hardware and vehicle support plus an export and service arrangement.

A utility smart meter may be required for some tariffs or export services, but not for every smart-charging or load-balancing setup. See our guide to smart meters for EV charging.

How amina fits

amina provides charging hardware for integration with specialist CPMS and energy partners. Current product wording describes C/C2 and M/M2 as using local OCPP 1.6J and being hardware-ready for OCPP 2.0.1; C2 and M2 are positioned as hardware-prepared for ISO 15118-20-related functions. This does not amount to a complete live V2G service. The deployed firmware, vehicle, backend, local controls and commercial service must be checked together.