... systemSingle phase & earth groundOutput voltage220VAC±3%(inverter output)Output frequency50±5Hz(normal), 50Hz±1%(abnormal)Dynamic voltage ... to 485), stem nodeAlarm functionAC/DC input under abnormal, overload condition and inverter problemsProtection functionAC input or output ... Ω(500VDC)Insulating strength2121VDC(AC input, output to ground, DC input to AC output, without flashover in one minute)Cooling ...