UNLIMITED FREE ACCESS TO THE WORLD'S BEST IDEAS

close
Already an Engineering360 user? Log in.

This is embarrasing...

An error occurred while processing the form. Please try again in a few minutes.

Customize Your Engineering360 Experience

close
Privacy Policy

This is embarrasing...

An error occurred while processing the form. Please try again in a few minutes.

UL - 9741 BULLETIN

UL Standard for Safety Electric Vehicle Power Export Equipment (EVPE)

active, Most Current
Organization: UL
Publication Date: 26 August 2021
Status: active
Page Count: 169
scope:

These requirements cover both unidirectional and bidirectional equipment that is connected to an electric vehicle. Unidirectional equipment exports power from the vehicle to off board loads including an electric power system such as the electric utility grid. Bidirectional equipment serves the same function but additionally provides power to the electric vehicle for recharging of the on board electric vehicle battery. Some bidirectional equipment may be configured to operate only in a unidirectional mode. The products covered by these requirements are intended to be installed in accordance with the National Electrical Code, NFPA 70, the Canadian Electrical Code, Part I, CSA C22.1, or other applicable installation code.

Some examples of equipment covered by this Standard have functionality as described below:

a) The equipment can be supplied by DC from the vehicle and acts as a standalone piece of equipment provided with an inverter for converting to AC power and terminating in receptacles for the connection to external loads;

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

c) The equipment can be supplied by DC from the vehicle and is provided with an inverter for converting to AC power and is permanently connected to the premise to provide power to receptacles that are not connected to the building wiring system;

d) The equipment can be supplied by AC from the vehicle and is provided with optional voltage conditioning equipment and is permanently connected to the premise to provide power to receptacles that are not connected to the building wiring system;

e) The equipment can be supplied by DC from the vehicle and is provided with an inverter for converting to AC power and is permanently connected to the premise to provide power to receptacles that are interconnected with building wiring systems through a transfer switch;

f) The equipment can be supplied by AC from the vehicle and is provided with optional voltage conditioning equipment and is permanently connected to the premise to provide power to receptacles that are interconnected with building wiring systems through a transfer switch;

g) The equipment can be supplied by DC from the vehicle and is provided with an inverter for converting to AC power and is permanently connected to the premise wiring system with grid interaction power export but is prevented from export to the utility grid by PCS control;

h) The equipment can be supplied by AC from the vehicle and is provided with optional voltage conditioning equipment and is permanently connected to the premise wiring system with grid interactive power export but is prevented from export to the utility grid by PCS control;

i) The equipment can be supplied by DC from the vehicle and is provided with an inverter for converting to AC power and is permanently connected to the premise wiring system for interactive power export including backfeed to the utility grid;

j) The equipment can be supplied by AC from the vehicle and is provided with optional voltage conditioning equipment and is permanently connected to the premise wiring system for grid interactive power export including backfeed to the utility grid; and

k) The equipment can be supplied by DC from the vehicle and is provided to an output to connect to other inverter/converter/power conditioning equipment (such as UL 1741, Standard for Inverters, Converters, Controllers and Interconnection System Equipment for Use With Distributed Energy Resources, CSA C22.2 No. 107.1, Power conversion equipment, or CAN/CSA C22.2 No. 62109-1 or UL 62109-1, Standard for safety of power converters for use in photovoltaic power systems - Part 1: General requirements) and / or loads.

All of the equipment type, (a) through (k) 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 and will comply with the requirements for the functions it performs.

For grid interactive equipment, these requirements are intended to be used in conjunction with UL 1741, Standard for Inverters, Converters, Controllers and Interconnection System Equipment for Use With Distributed Energy Resources and CSA C22.2 No. 107.1, Power conversion equipment, which addresses the grid interconnection compliance. UL 1741 and CSA C22.2 No. 107.1 provide guidance and options for evaluation and testing in accordance with specific utility grid interconnection requirements and standards such as Interconnection and Interoperability of Distributed Energy Resources with Associated Electric Power Systems Interfaces, IEEE 1547, Interconnection of Distributed Resources and Electricity Supply Systems, CSA C22.3 No. 9, and the Standard Conformance Test Procedures for Equipment Interconnecting Distributed Energy Resources with Electric Power Systems and Associated Interfaces, IEEE 1547.1, California Rule 21, Hawaii 14H.

The power export functionality will include enable and disable functions to limit or prevent export to the utility grid for locations that are not capable of or permitted to receive backfeed power. This functionality is addressed using the UL 1741 Power Control System (PCS) requirements.

The equipment includes off board equipment only. Equipment may be considered for indoor use only or indoor/outdoor use.

This Standard covers equipment that perform power conversion and Interconnection Systems Equipment (ISE) functionality. These functions may be located within one piece of equipment or within multiple pieces of equipment.

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.

These requirements do not cover battery chargers covered by the Standard for Battery Chargers for Charging Engine-Starter Batteries, UL 1236, or the Standard for Industrial Battery Chargers, UL 1564, or Battery Chargers, CSA C22.2 No. 107.2.

The requirements for devices or systems intended to reduce the risk of electric shock to the user in grounded or isolated circuits for charging electric vehicles are covered in the Standard for Personnel Protection Systems for Electric Vehicle (EV) Supply Circuits; Part 1: General Requirements, UL 2231-1/CSA C22.2 No. 281.1, and the Standard for Personnel Protection Systems for Electric Vehicle (EV) Supply Circuits; Part 2: Particular Requirements for Protective Devices for Use in Charging Systems, UL 2231-2/CSA C22.2 No. 281.2.

Equipment covered by this Standard may additionally be evaluated to SAE J3072, Standard: Interconnection Requirements for Onboard, Utility-Interactive Inverter Systems.

Equipment covered by this standard may communicate with other equipment and systems via standardized communications protocols such as but not limited to the Standard for Smart Energy Profile Application Protocol, IEEE 2030.5, and the Standard for Electric Power Systems Communications-Distributed Network Protocol (DNP3), IEEE 1815, Sunspec Modbus.

Equipment covered by this Standard may include connections to alternative power sources including but not limited to photovoltaic, wind turbine, fuel cell, and energy storage.

Document History

9741 BULLETIN
August 26, 2021
UL Standard for Safety Electric Vehicle Power Export Equipment (EVPE)
These requirements cover both unidirectional and bidirectional equipment that is connected to an electric vehicle. Unidirectional equipment exports power from the vehicle to off board loads including...
March 20, 2014
UL Outline of Investigation for Bidirectional Electric Vehicle (EV) Charging System Equipment
A description is not available for this item.

References

Advertisement