Highly efficient, three-phase UPS with modern functions, excellent specs and durable electrical equipment, Serial RS232, RS485 and USB interfaces, dry contacts, 1 x internal battery string (2 x empty battery slots), SNMP network card for simple monitoring and administration on Windows available separately. Runtime at 13.5 kW: approx. 5.1 min Runtime at 10.5 kW: approx. 7.8 min Runtime at 7.5 kW: approx. 13 min Please note: Important: the UPS must be connected by a professional! Optional monitoring and administration of the UPS only possible on Windows!