BESS is a battery energy storage system with inverters, battery, cooling, output transformer, safety features and controls. Helping to minimize energy costs, it delivers standard conformity, scalable configuration, and peace of mind in a fully self-contained solution. The same as solar cells are combined in panels, and pannels are organized in arrays, scaling-up battery systems follows the same principles of. by an agency of the U. Government nor any agency thereof, nor any of their employees, makes any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness, of any information, apparatus, product, or. These containerized battery energy storage systems are widely used in commercial, industrial, and utility-scale applications. But one of the most important factors in choosing the right solution is understanding BESS container size, including how internal battery rack layout and usable capacity. EVESCO's battery systems utilize UL1642 cells, UL1973 modules and UL9540A tested racks ensuring both safety and quality. You can see the build-up of the battery from cell to rack in the picture below. The batteries and converters, transformer, controls, cooling and auxiliary equipment are pre-assembled in the self-contained unit for 'plug and play' use.