Siemens 6EP1933-2EC41 SITOP UPS500S BASIC UNIT 2.5 KWS. SITOP UPS500S maintenance-free uninterruptible power supply with USB interface basic device 2.5 kWs input: 24 V DC output: 24 V DC/15 A degree of protection IP20. It belongs to DC UPS with capacitors. Recorded manufacturer technical characteristics include Interface: USB; Efficiency: 97.5 %; Power loss: 9 W; Energy storage: 2.5 kW.s (capacitor-based); Input voltage range: 22 ... 29 V DC; Peak output current: 25 A; Rated input current: 15.2 A; Rated input voltage: 24 V DC.