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LoRa technology has been used for many industry.It has lower power consumption and Longer Range (8km).Sky Trackeris the 1sttracker to use LoRa.Base on big data server including weather and topography and so on. Give out the control method for Bifacial tracking system:Sunny day—Current control method；Cloudy day—sun-eye mode；Heavy cloudy day—back+front mode；0.5％~2% yield increase.