... -SS Advantages1) High quality of power generation connected to the grid: THDi < 1%.2) Maximize Solar Energy: High MPPT Efficiency > 99 ... VDE 0126-1-1/A1, RD1663, ENEL, G83,G59, SAAAC grid frequencyAccording to VDE 0126-1-1/A1, RD1663, ENEL, G83 ... optional)Standard warranty[years]5/10( optional) GW2000-SS on grid dc ac power inverter