APC Smart-UPS 1500VA USB and Serial 2U Rackmount UPS System with ATX 1500 Power Supply SUA1500RM2U (Discontinued by Manufacturer) Output Power Capacity: 980 Watts/1440 VA Nominal Output Voltage: 120 V Output Frequency (sync to mains): 47 to 53 Hz for 50 Hz nominal, 57 to 63 Hz for 60 Hz nominal Waveform Type: Sine wave Typical recharge time: 3 hours