UL 9540 represents a safety standard targeted at energy storage systems. When it comes to energy storage systems connected to a utility grid, the UL 9540 standard extends to the equipment utilized to establish that connection. This standard addresses fire and explosion safety concerns associated wit Contact online >>
UL 9540 represents a safety standard targeted at energy storage systems. When it comes to energy storage systems connected to a utility grid, the UL 9540 standard extends to the equipment utilized to establish that connection. This standard addresses fire and explosion safety concerns associated with ESS, encompassing aspects such as:
As an ESS comprises multiple components, the UL 9540 standard actually consolidates two other older standards: UL 1973 (for the stationary battery pack) and UL 1741 (for the inverter). These two individual standards, alongside rigorous thermal and electrical testing and evaluation of the components working collectively as a system, collectively form the UL 9540 certification.
While UL 9540 represents a set of standards an energy storage system must adhere to, UL 9540A offers a method for evaluating thermal runaway propagation within an ESS. Therefore, while UL 9540A is not a certification in itself, it furnishes vital data for manufacturers seeking certification for their ESS products under UL 9540, and for their engineers and product developers to verify the product''s effectiveness in protecting against critical hazards like fire.
Module testing – Evaluating the ability of thermal runaway to propagate from one cell to others within groups or "modules," as well as outside the module.
Unit testing – Analyzing the potential for fire to spread from unit to unit, along with the rate of heat release and gas composition to determine the likelihood of an explosion.
Currently, certification of an energy storage system to UL 9540 is not mandatory in most jurisdictions in the United States. However, the California building code has adopted the International Residential Code (IRC), which necessitates UL 9540 for ESS. Massachusetts has also recently adopted this code. It is anticipated that other cities and states across the country may follow suit, making it a requirement in the years ahead.
Even if UL 9540 is not mandatory in your area, limiting your search for energy storage systems to UL 9540-certified systems offers several advantages, including:
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