To achieve UL 9540 Listing, Viridi completed UL 9540A Ed. 5 unit-level testing to the residential, indoor, floor-mounted standard - the most stringent of the UL 9540A test conditions - for the pack (RPS50kWh).
The system met all five performance criteria, with no smoke, gas, or fire detected during testing—and no detectable increase in heat in adjacent packs - reinforcing its ability to safely operate in indoor and occupied environments. As a result, Viridi systems can be deployed across commercial and industrial settings without the need for additional fire suppression or secondary safety systems.
The award of the standard enables virtual power plants (VPPs) and distributed energy systems to scale while reducing risks associated with conventional BESS.
Designed for safe indoor installation, the system enables deployment in occupied, space-constrained environments where traditional systems have faced safety and permitting limitations. With scalable configurations, RPSLinkIN unlocks new opportunities for deploying energy storage behind the meter across commercial and industrial applications, including critical infrastructure.
Viridi’s RPSLinkIN system utilises proprietary fail-safe lithium-ion technology designed to prevent thermal propagation, eliminating the risk of fire. The system can now be safely deployed across commercial, municipal, and critical infrastructure environments, including industrial, hospital, education, hospitality, and multifamily buildings.
“Achieving UL 9540 Listing, utilising UL’s strictest indoor residential test, is a major milestone for Viridi and for the broader energy storage industry” said Jon M. Williams, CEO of Viridi. “Safety has been one of the primary barriers to scaling battery storage, particularly in critical infrastructure and occupied environments. With RPSLinkIN, we’re enabling organisations to deploy indoor energy storage systems where it wasn’t previously possible - unlocking new opportunities for resilience, cost savings, and decarbonization, and representing a fundamental shift in how and where battery systems can be deployed.”
The listing builds on a growing portfolio of real-world deployments demonstrating the system’s performance in mission-critical environments. These deployments range from indoor installations at the US Department of Energy’s Oak Ridge National Laboratory to a 600 kWh indoor energy system at the Hauptman-Woodward Medical Research Institute - one of the first large-scale indoor battery storage installations of its kind - as well as several multi-MWh indoor installations and other projects supporting critical infrastructure.
In Erie County, New York, Viridi’s RPSLinkIN system was installed at a wastewater pumping station, delivering up to 90 hours of reliable backup power while replacing diesel generators, reducing maintenance costs, and improving system resilience.
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