... reverse polarity, AC short-circuit protection, ground fault monitoring, grid monitoring, integrate all-pole sensitive, leakage current monitoring unit.> ... 60HzGrid Frequency Range 40.1~50.9Hz Grid Current THD < 3% (at nominal power)AC connectionsingle phasesingle phasesingle phasesingle phasesingle ... 11.7kg12.2kg 21kg21kg AC CONNECTOR DC SWITCH Growatt solar power system 1500W 2000W 3000W 4400W 5000W