... protection , DC isolation monitoring , DC monitoring,Grounding fault monitoring , Grid monitoring , Island protection , Short circuit protection , Over temperature ... , EXTOptional communication modeWiFi , Ethernet , GPRS(External modular design , connected to EXT)Mechanical ParametersDimension(H x W x Dmm)560 ... 3,EN61000-11:12Maintenance5 years,(10 years Optional) Grid-tied Solar Inverter(4KW,5KW,6KW)