Method and device for identifying weather condition by means of multiple pyranometers

A device for determining weather conditions, comprising:

• a first pyranometer configured to measure a horizontal irradiance, wherein a measuring surface of the first pyranometer is arranged to be horizontally placed;
• a second pyranometer configured to measure a first slope irradiance;
• a third pyranometer configured to measure a second slope irradiance, wherein the measuring surface of the second pyranometer and a measuring surface of the third pyranometer are arranged to face the sun symmetrically with respect to the meridian plane;
• and
• a processing unit configured to receive the horizontal irradiance, the first slope irradiance, and the second slope irradiance, determine an azimuth irradiation deviation rate according to the horizontal irradiance, the first slope irradiance and the second slope irradiance, and determine a weather condition according to the horizontal irradiance, the first slope irradiance, the second slope irradiance and the azimuth irradiation deviation rate.