UL 9741-2023-09
STANDARD FOR SAFETY Electric Vehicle Power Export Equipment (EVPE)

Standard No.

UL 9741-2023-09

Release Date

2023

Published By

Underwriters Laboratories (UL)

Scope

1.1 The requirements of this standard apply to off-board unidirectional and bidirectional devices rated at 1000 volts ac and 1500 volts dc or less that transfer electrical energy between an electric vehicle and off-board loads through a permanently attached vehicle connector and operate in parallel with an electrical power system, such as the utility grid. Devices with optional bidirectional functionality may function as either electric vehicle power export equipment (EVPE) or electric vehicle supply equipment (EVSE). Products to which these requirements apply are intended to be installed in accordance with the National Electrical Code, NFPA 70, and the Canadian Electrical Code, CSA C22.1, Part I. 1.2 The requirements of this standard apply to devices intended for indoor or outdoor use. 1.3 Requirements for devices without power export functionality are covered in the Standard for Electric Vehicle Supply Equipment, NMX-J-677 ANCE/CSA C22.2 No. 280/UL 2594, or the Standard for Electric Vehicle DC Charging Equipment, NMX-J-817 ANCE/CSA C22.2 No. 346/UL 2202. 1.4 The equipment configuration functions applicable to this standard are as follows: a) The equipment can be powered by the DC power supply provided by the vehicle and, as a stand-alone device, is equipped with a converter to provide AC or DC power to the AC or DC socket connected to the external load; b) The equipment can be powered by the AC power supply provided by the vehicle and, as a stand-alone device, is equipped with an optional voltage regulating device to provide AC power to the AC socket connected to the external load; c) The equipment can be powered by the DC power supply provided by the vehicle and is equipped with a converter permanently connected to the building to provide AC or DC power to the load not interconnected with the power grid; d) The equipment can be powered by the AC power supply provided by the vehicle and is equipped with an optional converter permanently connected to the building to provide AC or DC power to the load not interconnected with the power grid; e) The equipment can be powered by the DC power supply provided by the vehicle and is equipped with an inverter permanently connected to the building to provide AC power to the building wiring system through a transfer switch; f) The equipment can be powered by the AC power supply provided by the vehicle and is equipped with an optional voltage regulating device permanently connected to the building to provide AC power to the building wiring system through a transfer switch; g) The equipment can be powered by the DC power provided by the vehicle and equipped with an inverter to permanently connect the AC power to the building wiring system, capable of operating in parallel with the regional power system (AREA EPS), but prevented from exporting to the grid by PCS control; h) The equipment can be powered by the AC power provided by the vehicle and equipped with an optional voltage regulation device to permanently connect the AC power to the building wiring system, capable of operating in parallel with the AREA EPS, but prevented from exporting to the grid by PCS control; i) The equipment can be powered by the DC power provided by the vehicle and equipped with a grid-connected inverter to permanently connect the AC power to the building wiring system, capable of operating in parallel with the AREA EPS, but without islanding function (no backup power in the event of a grid outage); j) The equipment can be powered by the AC power provided by the vehicle and equipped with an optional voltage regulation device to permanently connect the AC power to the building wiring system, capable of operating in parallel with the AREA EPS, but without islanding function (no backup power in the event of a grid outage); k) The equipment can be powered by the DC power provided by the vehicle and equipped with a grid-connected inverter to permanently connect the AC power to the building wiring system, capable of operating in parallel with the AREA EPS, and with islanding function (backup power in the event of a grid outage); l) The device can be powered by the AC power provided by the vehicle and equipped with optional voltage regulation equipment, permanently connected to the building wiring system, capable of operating in parallel with the AREA EPS and having islanding capabilities (backup power in the event of a grid outage); m) The device can be powered by the DC power provided by the vehicle to other inverters/converters/power regulation devices that interact with the grid and can operate in parallel with the AREA EPS, provide AC power to the grid, and meet other special purpose requirements; n) The device can be powered by the AC power provided by the vehicle, permanently connected to the building wiring system, and use an on-board interactive inverter that meets the performance requirements of SAE J3072, including communication protocols for EV-EVPE device interface, and operate in parallel with the AREA EPS. All of the above device configurations (a to n) can also provide charging capabilities for electric vehicles. All devices are equipped with functions that will disconnect the vehicle from the load when the power provided by the vehicle exceeds a certain limit. Some products may be able to operate in multiple modes. 1.5 The power export function includes enable and disable functions to limit or prevent power export to the grid, which is suitable for locations where reverse power is not allowed or cannot be received. This function is addressed by the requirements of UL 1741, the Standard for Inverters, Converters, Controllers and Interconnected System Equipment. 1.6 The equipment performs both power conversion and interconnected system equipment (ISE) functions. These functions may be located in one device or in multiple devices. 1.7 Equipment that is not an integral component and relies on being installed into a final product to meet the requirements of this standard will be evaluated against the requirements of this standard and the final product standard. 1.8 These requirements do not apply to battery chargers. The requirements for these products may be found in UL 1236, the Standard for Engine Starting Battery Chargers, UL 1564, the Standard for Industrial Battery Chargers, or CSA C22.2 No. 107.2, Battery Chargers.

UL 9741-2023-09 Referenced Document

• CSA C22.1 2021 Canadian Electrical Code
• IEEE 1547-2018 Interconnecting Distributed Resources with Electric Power Systems Amendment 1
• IEEE 1547.1-2020 Conformance Test Procedures for Equipment Interconnecting Distributed Resources with Electric Power Systems Amendment 1
• NFPA 70 National Electrical Code® Errata 70-23-4, Reference: 701.12(I)
• SAE J3072 Interconnection Requirements for Onboard, Grid Support Inverter Systems*， 2024-06-10 Update
• UL 1236 Battery chargers for charging engine-starter batteries*， 2025-05-05 Update
• UL 1310 Class 2 power units*， 2025-05-05 Update
• UL 1564 UL Standard for Safety Industrial Battery Chargers*， 2025-05-05 Update
• UL 1741 Standard for Safety for Inverters, Converters, Controllers and Interconnection System Equipment for Use With Distributed Energy Resources

Standard and Specification