... high frequency,online double conversion,IGBT 2.N+X redundant,Hot-swap,green UPS 3.high reliablity, ... features with high efficiency (≥95%), high stability (N+X redundancy) and extremely high cost-efficiency.POWER RANGESystem capacity: ... as a unique UPS uniteRedundant updateable system: N+X redundancy, supports on-line upgrade and expansion with ... just with the power module changed. UPS for computer