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The main drawback of a UPS with an IGBT (Insulated Gate Bipolar Transistor) rectifier is that it is much more expensive than traditional SCR (Silicon Controlled Rectifier) based UPS systems. IGBT technology is generally more advanced and capable of providing higher efficiency and better performance, but this comes at a higher manufacturing cost. The complexity of the IGBT circuitry and the materials used contribute to the increased expense. In contrast, SCR-based systems are more established and simpler in design, which generally allows them to be produced at a lower cost, making them more accessible for different budgets.

While tuning, emergency power-off functions, and input window constraints are important considerations in power management and UPS systems, they are not as immediate or significant as the cost factor when comparing IGBT rectifiers to SCR-based solutions. The focus on cost becomes particularly crucial for organizations that are evaluating their options for backup power solutions, and this economic consideration often leads to a preference for the more cost-effective options.