An improved z source inverter (ZSI) called Switched Inductor Quasi Z-Source inverter (SL-QZSI) is developed to perk up voltage boost ability. The proposed topology is customized from the conventional topology by adding some more inductors and diodes into inductor branch to the conventional Z-source network. This paper presents a comparative analysis of Boost Inversion Ability of Switched Inductor Quasi Z-Source inverter (SL-QZSI) with conventional Z-source Inverter (ZSI). In comparison to conventional ZSI for the same value of voltages in the input and output, the proposed SL-QZSI provides the less count on passive component, a dc-source with common ground, less voltage across the capacitors, it gives the continuous input current, current shoot through is reduced and also the current stress across the inductor and diodes are reduced. This paper presents the operating principle, boost inversion ability analysis, simulation results and comparison of conventional ZSI with SLQZSI. The simulation results confirmed the ability of high step up inversion by this proposed SL-QZSI. © 2014 IEEE.