With the increasing popularity of portable backup power supplies, various styles of portable backup power supplies have appeared on the market. According to incomplete statistics, many products on the market cannot meet the requirements of relevant laws and regulations, and even cause various safety problems.

01

Portable Power

So, what kind of portable backup power supply is safe? Of course, products that comply with the relevant laws, regulations and standards of various countries and regions are considered safe products. The earliest standard for portable backup power products comes from the United States. The standard number is UL 2743 STANDARD FOR SAFETY – Portable Power Packs. The first edition was published as early as 2016. It is suitable for built-in batteries and has one or more input and output ports. Various portable power products with car emergency start ignition function, lights, emergency warning lights, voltmeters, built-in air pumps, and other similar functional products, but products within the scope of UL 2056 are not within the scope of this standard.

A safe portable backup power product first depends on the safety of its own key components, especially when designing products and selecting supply chains, if the safety of key components is fully considered, it seems that it will increase product development and production. Cost, in fact, for enterprises that require the production of safe and reliable products, it means avoiding detours, reducing product R&D costs and R&D cycles, and the development costs will naturally be greatly reduced. Take the lead and win the market.

Next we will

UL 2743 2nd Edition + Revisions:

The 2020 standard is interpreted for everyone…

02

UL 2743 Standard Analysis

#1 Product Range Design:

Portable backup power products may contain the following parts:

Contains one or more batteries, electrochemical capacitors, electrochemical capacitor modules;

The built-in battery must be a lead-acid battery or a lithium-ion battery;

has one or more inputs and one or more outputs;

With car emergency ignition function, its maximum voltage output does not exceed 24V;

Can be used outdoors or briefly outdoors and indoors;

With the similar function of the air pump, the similar function of the warning light or the lighting lamp,

Voltmeter, related instruments;

Inverter, car charger adapter, battery charging circuit;

Products within the scope of UL 2056 are excluded from the scope of this standard.

#2 Critical components must meet:

UL 94 & UL 746C

non-metallic material

UL 635

Insulated cable retaining ring

UL 60950-1, UL 1310, or UL 1012

External power supply

UL 2089

car charger adapter

UL 1741 or UL 62109-1

Inverters, converters, controllers, photovoltaic power system converters

UL 1977 or UL 1839

Car ignition start cable connector, car ignition start cable

UL 1839 & UL 758

car ignition start cable

UL 1839

Car ignition starting current clamp

UL 498

NEMA type socket

UL 1977

output connector, output USB socket

UL 758

car charger socket cable

IEC 60417 No. 5019

Grounding Compliance Mark

UL 1097

double insulation system

UL 1581

Line Insulation for High Voltage Circuits

UL 510

Insulation Tape

UL 746C

Insulation Materials

UL 1450

air pump

UL 1004-3

Motor thermal protector

UL 810A

Electrochemical capacitor unit

UL 506, UL 1561, UL 5085-1,

UL 5085-2, UL 5085-3

transformer

UL 796

PWB

UL 1989

Lead-acid batteries

UL 1642 or UL 62133

Lithium-ion battery

UL 1012

Inverter

UL 1236

Charging function

UL 60730-1

Safety Circuits and Control Circuits

#3 Product Testing Project

Power Input Test

input test

Normal Charging Operation Test

Normal charging operation test

Lithium Charging System Test

Lithium-based charging system test

Capacitor Discharge Test

Capacitor discharge test

Leakage Current Test

Leakage current test

Normal Temperature Test

Normal temperature rise test

Maximum normal load

Maximum normal load test

Power pack ampacity temperature test

Power supply starting current capability temperature rise test

Dielectric Voltage Withstand Test

Electric strength test

Leakage Current Following Humidity Conditioning

Leakage current test after tidal

Abnormal Operation Tests

Abnormal operation test

Output short test

Output short circuit test

Reverse polarity of booster cables

Reverse polarity test of automobile emergency start line

Component faults

Component failure test

Relay and solenoid burnout

Relay and Coil Burnout Test

Printed-wiring board abnormal test

PWB abnormal test

Disconnected fan test

Disconnect the fan test

Blocked ventilation test

Obstructed Vent Test

Overcharging test

Overcharge test

Internal battery reverse polarity test

Internal battery pack reverse polarity test

Vibration Test

Vibration test

Ground continuity

Earth Resistance Test

Overload of switches and controls test

Switch and control gear overload test

Overload of protection devices

Protection device overload test

Overload of interlocks

Interlock Overload Test

Push-back strain relief test

Power Cord Reverse Stress Relief Test

Impact Test

Steel ball impact test

drop test

drop test

Mold stress test

High temperature stress relief test

Strength of handle test

Handle Strength Test

Stability Test

Stability test

Hydrostatic Strength Test

Hydrostatic pressure strength test

Rain Test

rain test

Test on Insulating Materials

Dielectric strength test of insulating materials

Accelerated Aging of Gaskets, Sealing

Compounds, and Adhesive Test

Gaskets, Sealing Compounds, and Adhesives Accelerated Weathering Testing

Metallic Coating Thickness Test

Metal Coating Thickness Test

Permanency of Wrapped Hang Tag Marking

Durability of tag marks

Power Pack Ampacity Test

Power supply starting current capability test

Back Feed Test

energy surge test

Cold Bend Test

Cold bending test

Cold drop test (Clamp)

Low temperature drop test of clips

Dielectric voltage-withstand test (Clamp)

Dielectric strength test of clips

Secureness test (Clamp)

Crimping firmness test of clips

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