... Protection; 7, Easy to Install and Friendly Operation; 8, Voltage and Frequency is Optional:220V/110V+-10%,50/60Hz; Model/Spec WS ... 36V/48V 36V/48V 48v AC Ouput Voltage (V) 220V ± 3% AC / 110V ± 3% AC Frequency (Hz) 50Hz ± 0.5% / 60Hz ± 0 ... Saving Mode Yes Panel Display LED Display Voltage 110V / 220V / 230V Optional, CPU Control Frequency 50Hz / 60Hz Optional, CPU Control Battery Manager ...