Vehicle to grid charging equipment

Note: The scope for this NOI (originally published on December 8, 2020) was updated by the responsible SDO on August 22, 2023.

1.1 The requirements of this standard apply to off-board unidirectional and bidirectional equipment rated 1000 Vac and 1500 Vdc or less, that transfers electrical energy between an electric vehicle and off board loads as well as operating in parallel with an electric power system, such as the electric utility grid, using a permanently attached vehicle connector. Equipment that has optional bidirectional functionality serves as both Electric Vehicle Power Export Equipment (EVPE) and electric vehicle supply equipment (EVSE). The products to which these requirements apply are intended to be installed in accordance with the National Electrical Code, NFPA 70, and CSA C22.1, Canadian Electrical Code, Part I.

1.2 The requirements of this standard are intended to apply to equipment for indoor or outdoor use.

1.3 The requirements for equipment without power export functionality are contained in the Standard for Electric Vehicle Supply Equipment, NMX-J-677 ANCE/CSA C22.2 No. 280/UL 2594 or the Standard for DC Charging Equipment for Electric Vehicles, NMX-J-817 ANCE/CSA C22.2 No. 346/UL 2202.

1.4 Some configurations of equipment to which the requirements of this Standard apply have functionality as described below:

a) The equipment can be supplied by DC power from the vehicle and acts as a standalone piece of equipment provided with a converter and provides AC and/or DC power to AC and/or DC receptacles for the connection to external loads;

b) The equipment can be supplied by AC power from the vehicle and acts as a standalone piece of equipment, provided with optional voltage conditioning equipment, and provides AC power to AC receptacles for the connection to external loads;

c) The equipment can be supplied by DC power from the vehicle and is provided with a converter that is permanently connected to the premise and provides AC or DC power to loads that are not interconnected (electrically connected) to the grid connected part of the premise wiring system;

d) The equipment can be supplied by AC power from the vehicle and is provided with an optional converter and is permanently connected to the premise and provides AC or DC power to loads that are not interconnected (electrically connected) to the grid connected part of the premise wiring system;

e) The equipment can be supplied by DC power from the vehicle and is provided with an inverter that is permanently connected to the premise, and provides AC power to premise wiring systems through a transfer switch;

f) The equipment can be supplied by AC power from the vehicle and is provided with optional voltage conditioning equipment and is permanently connected to the premise, and provides AC power to premise wiring systems through a transfer switch;

g) The equipment can be supplied by DC power from the vehicle and is provided with an inverter for converting to AC power and is permanently connected to the premise wiring system with capability to operate in parallel with the area electric power system (AREA EPS) but is prevented from export to the utility grid by PCS control;

h) The equipment can be supplied by AC power from the vehicle and is provided with optional voltage conditioning equipment and is permanently connected to the premise wiring system with capability to operate in parallel with the AREA EPS but is prevented from export to the utility grid by PCS control; i) The equipment can be supplied by DC power from the vehicle and the equipment is provided with a grid-tie inverter for converting to AC power and is permanently connected to the premise wiring system, with capability to operate in parallel with the AREA EPS but not islanding (no back-up during grid outage);

j) The equipment can be supplied by AC power from the vehicle and is provided with optional voltage conditioning equipment and is permanently connected to the premise wiring system, with capability to operate in parallel with the AREA EPS but not islanding (no back-up during grid outage);

k) The equipment can be supplied by DC power from the vehicle and the equipment is provided with a grid-tie inverter for converting to AC power and is permanently connected to the premise wiring system, with capability to operate in parallel with the AREA EPS with islanding (back-up during grid outage);

l) The equipment can be supplied by AC power from the vehicle and is provided with optional voltage conditioning equipment and is permanently connected to the premise wiring system, with capability to operate in parallel with the AREA EPS with islanding (back-up during grid outage);

m) The equipment can be supplied by DC power from the vehicle to other inverter/converter/power conditioning equipment that is grid interactive with capability to operate in parallel with the AREA EPS for supplying AC power to the grid, and for other special purpose requirements; and

n) The equipment can be supplied by AC power from the vehicle and is permanently connected to the premise wiring system and uses EV on-board interactive inverters that meet SAE J3072 performance requirements including communications protocols appropriate for the EV-EVPE equipment interface and that operates in parallel with the AREA EPS.

All the above equipment configurations, (a) through (n), may also provide power to the electric vehicle for the purpose of charging the on-board battery. All equipment is provided with a function that will cause a disconnect between the vehicle and the load if power from the vehicle exceeds specific limits. Some products may be able to operate in multiple modes.

1.5 The power export functionality includes enable and disable functions to limit or prevent export to the utility grid for locations that are not capable of or permitted to receive back feed power. This functionality is addressed using requirements of the Standard for Inverters, Converters, Controllers, and Interconnection System Equipment for Use with Distributed Energy Resources, UL 1741.

1.6 The equipment performs power conversion and Interconnection Systems Equipment (ISE) functionality. These functions may be located within one piece of equipment or within multiple pieces of equipment.

1.7 Equipment that is not a complete assembly and depends upon installation in an end product for compliance with the requirements in this standard is evaluated under the requirements of this Standard and the standard for the end product.

1.8 These requirements do not apply to battery chargers. The requirements for these products can be found in the Standard for Battery Chargers for Charging Engine-Starter Batteries, UL 1236, the Standard for Industrial Battery Chargers, UL 1564, or CSA C22.2 No. 107.2, Battery Chargers.