Constant sky diffuse shading loss error.

Hi Rita,

Those negative power values at night are caused by the inverter's night time or standby power consumption, which is determined by the Power consumption at night input on the Inverter page.

The constant sky diffuse shading loss in the shading inputs reduces the amount of diffuse irradiance incident on the array. For any time steps when the direct normal irradiance (DNI) is zero, or when the array is completely shaded (beam shading loss = 100%), the only light available to the array is diffuse irradiance. If the diffuse shading loss is also 100%, then the array receives no light, and the inverter goes into standby mode and consumes power defined by the nighttime power consumption input.

Best regards,
Paul.