Technical Specification: Model C1K C1KS C2K C2KS C3K C3KS Rated capacity 1KVA/700W 2KVA/1400W 3KVA/2100W Input Voltage (145~276)VAC Frequency (40~60)Hz adjustable Output Voltage 220(1±2%)VAC Frequency Synchronization with the input(AC mains mode); above(46~54)Hz,it will be 50(1±0.2%)Hz 50Hz±0.1%(battery mode) Wave form Sine Wave Back-up time(Min.) (Full/Half) >5′/14′ External battery >9′/21′ External battery >5′∕17′ External battery Battery type VRLA maintenance free batteries External battery 　 36VDC 　 72VDC 　 96VDC Nominal voltage 　 (24V) 　 (48V) 　 (72V/48V) Transfer time 0ms Overload protection 110%-150% transfer to the bypass after 30s,above 150% after 200ms Communication RS-232+Intelligent Slot Operation environment Temperature 0℃ ～ 40℃ Humidity 20% ～ 90% Size(W*D*H mm) 145×400×220 192×460×340 Net Weight(kg) 13 7 32 15 33 16