Wagan ePowerCube1500 Solar Portable System Installed to box (about 0.8m). 650 w watt 12 v wind turbine generator+hybrid controller+inverter+solar panel cons single bearings will not eliminate vertical vibration yaw shaft diameter 35mm stabilizing distance effectively shorten to 1.4cm with one bearing (53% reduction) vibration will cause bearing to grind on yaw shaft and create a bigger play, which in turn will cause more vibration in a never ending cycle 2 pieces design yaw body is less stable.