American ANSI and Canadian SCC approved the safety standard ANSI/CAN/UL 2743:2023 for mobile energy storage power supply on April 14, 2023. This new edition is an important revision of the previous versions of UL 2743:2018 and UL 2743:2020 and includes a series of standard optimizations.
Some major updates
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hazardous voltage limits have been optimized (for indoor use products, the safe voltage limit is increased to 42.4Vpk or 60Vdc; for outdoor products or temporary outdoor products, the previous limit of 21.2Vpk or 30VDC is maintained).
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new definition of mobile, the introduction of the concept of 18kg. For non-fixed installation equipment, the equipment weight is less than 18kg, or provides a device that is easy to move, can be classified as mobile energy storage products.
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for AC outlets other than 15A ungrounded outlets, additional evaluation criteria (including UL 1012-Overcurrent Protection Requirements for AC Outlets and other relevant requirements).
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the vehicle charging voltage range is extended to support 24V rated input (the old standard only supports 12V input).
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added functional grounding requirements (including structural and identification requirements) for double insulation isolation products.
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for lithium batteries and lead-acid batteries, add multiple standard-compliant options (for example, for lithium batteries, it can meet any one of UL 1642, UL 62133, UL 1973, UL 2580).
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improve the leakage current test method, and supplement the test requirements for dangerous voltage to safe voltage port (e. g. between inverter AC port and low voltage terminal).
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for evaluation of critical safety circuits, add component single failure as an alternative to UL 60730-1.
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for lithium battery packs greater than 1kWh, increase the single cell failure test requirements (refer to UL 1973 single cell thermal diffusion test method).
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revised the drop test requirements to specify a 0.9m drop test for products under 18kg.
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optimize the test method of the emergency start output and clearly identify the requirements (current and duration).
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