... warning signal to prolong the lifespan of battery.10 Single-phase series type;0.5 1 1.5 2 2. ... 3 4 5 6 7 8 9 10 KVAthree -phase series type;3.3,7 5.5 7.5 11 ... 5 22 30 and more Specifications: 1 Input,220VAC ±15%,single phase with two wires,50HZ ±5%.2 Output,220VAC ±5%, ... in 1 second.3Protection:low-voltage,over-voltage,over-load,phase-shortage,short circuit,over-heat,accumulator over-charge, accumulator ...