The new Liebert EXL S1 is a more reliable and flexible high-frequency UPS product, featuring three-level technology in both rectifiers and inverters, achieving a double conversion efficiency of up to 97%. It also improves efficiency under light loads through intelligent parallel operation, reducing TCO and CO2 emissions. The newly introduced dynamic online mode ensures IEC 62040-1 Class A power quality and high availability, providing a runtime efficiency of up to 99%. The Liebert EXL S1 power range spans from 300 to 1200 kVA, with further optimization in efficiency and power density. Compared to products of the same power from other brands, the EXL S1 saves up to 60% of footprint, significantly reducing the space required for UPS and the entire power supply system. The Liebert EXL S1 can save substantial space for more IT servers or reduce the overall server room area, saving on construction costs. Additionally, the Liebert EXL S1's new dynamic online mode boosts the UPS system efficiency to 99% without compromising system reliability. In this mode, inverters can supply power to the load at any time according to IEC 62040 Class 1 standards, providing the same power quality as the standard online double conversion mode. The Liebert EXL S1 also features a 9-inch color touchscreen for easy and flexible device inquiry, operation, and remote management of device information through Vertiv Liebert Nform, SiteScan, and Trellis platforms. It is also communication protocol-compatible with users' third-party BMS and DCIM systems. Currently, the Liebert EXL S1 UPS series can easily integrate with Vertiv or other third-party lithium-ion battery solutions.