1 Scope

1.1 These requirements cover portable and movable power packs provided with one or more batteries, electrochemical capacitors, or electrochemical capacitor modules, to provide power to different types of appliances or equipment on site. The batteries or electrochemical capacitors shall be internal components of the power pack, external batteries may be connected to the power pack to expand the capacity of the power pack. The power packs are provided with one or more inputs and one or more outputs. For power packs provided with a booster function, the power packs are used for providing a temporary power source to a depleted land vehicle battery, rated 24 V dc maximum, to provide emergency starting power.

1.2 These requirements cover power packs suitable for outdoor use, temporary outdoor use, or indoor use only. Outdoor use packs are intended to be used outdoors with no restrictions. Temporary outdoor use packs are intended to be used outdoors in limited wet conditions and always stored indoors. Indoor use only packs are intended to be stored indoors and used indoors and are not intended to be used outdoors at any time. A power pack with a booster function is not considered indoor use only under any conditions.

1.3 These requirements cover power packs provided with additional systems such as an air compressor (tankless type) for inflating tires or other inflatable items, or with a light to act as warning lights to oncoming traffic, as a flashlight, or the like. These functions are also powered by the internal battery.

1.4 These requirements cover the power pack options such as lights, voltmeters, internal air compressor assemblies, associated gauges, inverters, vehicle adapters, and internal batteries, as well as the charging of the internal batteries, when these options are integral to the power pack.

1.5 These requirements cover the portable power packs integrated or attached in luggage, carrying cases, bags, or backpacks. These requirements do not cover the performance of luggage, carrying cases, bags or backpacks.

1.6 These requirements do not cover wiring or cabling used in the recharging function of electric vehicle recharging equipment.

1.7 These requirements do not cover power banks which are covered in the Standard for Power Banks, UL 2056.

1.8 These requirements do not cover power packs having a capacity exceeding the limits specified in , which are covered by the Standard for Energy Storage Systems and Equipment, UL 9540.

Portable power pack technology

Aggregate capacity

kWh

MJ

Lead-acid or valve regulated nickel, all types

70

252

Lithium-ion or sodium-ion, all types

20

72

Electrochemical Capacitors

3

10.8

1.9 These requirements do not cover power packs that are permanently connected to a premise wiring system, or having a function to supply power to a premise wiring system, or have utility interactive function, which are covered by the Standard for Energy Storage Systems and Equipment, UL 9540.

Summary of Topics

This new Third Edition of ANSI/CAN/UL 2743 dated September 24, 2025 includes the following changes:

– Addition of UPS standard for power pack with AC pass through function; Section 4, 5.2, 5.42, 12.1.3, 13.3.2, 15.1.1, 16.1, 16.2, 31.1, 32.1, and 49.1

– Construction clarification for PV input with hazardous voltage level or hazardous energy level; 12.5.1

– Revision/clarification of protective bonding through trace of Printed-wiring board; Section 4 and 15.1.12

– Addition of exception to 30.3.3 and 30.3.4, and Section 4

– Pollution degree for outdoor/indoor use power packs; 31.6

– Clarification of back feed requirements (both construction and test); Section 4, 35.2, and 71.1

– Revision to the drop test for power packs with wheels for movement; 60.3.2

– Clarification to the requirement for detachable or external battery packs ; 1.1, 1.7, 1.8, Section 4, 5.5, 5.16, 5.20, 5.28, 5.35, 6.5, 6.6, Section 9, 12.1.2, 13.2.1.4, 30.1.2 – 30.1.7, Section 30.4, 35.1, 44.1, 50.2.8, Section 55.10, 55.11.1, 55.11.2, 55.11.3 and 71.2

– Cord and Plug Connection; Section 4, 5.14, 5.37, 7.1.2, Section 12.2.1, 13.3.2, 74.1, and 78.2

– Addition of Valve Regulated Nickel and Sodium-ion battery; 1.1, 1.8, Table 1.1, Section 4, 5.33, 5.43, 5.44, 5.45, 5.47, 5.48, 7.1.4, 30.1.2, 30.2.1, 30.3.2, 30.3.4, 44.6, 46.1, 70.1, 74.1, 75.11, 77.3

– Addition of requirement for backpacked portable power pack; 1.5, 40.1, Section 41, Table 42.1, 62.1, 62.2, 77.3

– Peak discharge current rating test; 50.3.1, 70.1 – 70.4, Figure 70.1, 74.1