... optional 1. GoodWe GW4200-DS Advantages1) High quality of power generation connected to the grid: THDi < 2%.2) Maximize Solar Energy: ... to VDE-AR-N 4105, RD1663, ENEL, G59, SAAAC grid frequencyAccording to VDE-AR-N 4105, RD1663, ENEL, G59, ... unitIntegratedDC switchOptionalIslanding protectionAFDGrid MonitoringAccording to VDE-AR-N 4105, AS4777.1/2/3, RD1663, ENEL Guide, G59-2Normative ReferenceEMC- ...