Model number MF6KVA Capacity 6000V/4200W Rating input voltage 230V Operating voltage range 170V-280V Input power factor ≥99% Norminal output voltage 230V Output frequency synchronized with the utility on AC mode, 50HZ/60HZ±0.2% on battery mode Harmonic distortion <2%(liner load) Efficiency ≥90% Battery specification Battery DC voltage 240VDC Battery type 12/7AH*20 Back up time(50% load) 20min Back up time(full load) 7min Charge current(Standard unit) 1A Typical recharge time 6-8hours(to 90% of full capacity) Transfer time(Between AC mode and battery mode) 0ms Transfer time(Between AC mode and bypass mode) 0ms Operating temperature 0-40°Noise level 45dB Humidity range 1500m