A highly efficient, easy-to-implement, three-phase uninterruptible power supply (UPS) with 100 kW and 400 V for top-tier power protection and low total cost of ownership at the network edge, in small and medium data centers, as well as for critical infrastructure in commercial and industrial applications. This UPS is designed for up to 5 intelligent high-capacity battery strings but is delivered without batteries. This allows for easy adaptation with the appropriate battery modules for various autonomy times. Includes start-up service 5 x 8.