The Solis S5-GR3P(12-20)K(21A) three-phase string inverter is a next-generation model in the Solis 5G series, specifically designed for residential PV applications. Compact size, high efficiency, multiple protection features, reliable safety, intelligent stability, diverse models. Single string input current increased to 21A, voltage increased to 1000V, fully compatible with various high-efficiency modules and bifacial PV modules, optimizing system design to enhance yield. Protection rating upgraded to IP66, enhancing the inverter's environmental adaptability. Further optimized algorithms provide strong support for weak grids, ensuring more stable grid connection.