APC Smart-UPS VT 20kVA 400V w/4 Batt. Mod., Start-Up 5X8, Internal Maint Bypass, Parallel Capability with AP9631 Preinstalled.16 .0 kWatts Confirgurable Power , Double Conversion Online , Pure sinewave , Configurable for 380 : 400 or 415 V 3 Phase nominal output voltage ,304 - 477V Input Voltage , 400V 3PH Hard Wire 5-wire (3PH + N + G) Included Battery Modules 4 = 9810 VAH , DB-9 RS-232, Smart-Slot Multi-function LCD status and control console,DB-9 RS-232, Smart-Slot