On June 29th LONGi launched its new Hi-MO 5 product for ultra large power plants. Hi-MO 5 is based on M10 gallium doped monocrystalline wafers and uses smart soldering technology. The 72c module power reaches 540W, with an efficiency of more than 21%. The product not only has excellent reliability on the manufacturing side, but also brings more value to customers on the system side. This article will explain how Hi-MO 5 performs so well on the BOS cost saving side and its underlying logic.