400V: 25K/30K/33K/36K/40K/40K-HV/50K-HV   S5-GC(25-50)K three-phase series string inverter adopt 3/4 MPPT design to provide a more flexible configuration scheme with a smaller environmental impact rate and higher generation efficiency. Whose operation is so quiet, like a whisper, thus creating a more comfortable and friendly working and living environment.