<p>Unbalance in power systems, motor systems, and other applications is a prevalent issue that significantly impacts system performance. While load unbalance has been extensively studied, the impact of input unbalance has received comparatively less attention. This paper aims to address such gap by presenting a method for calculating dc-link current and voltage ripples in five-phase voltage source inverter under unbalanced input conditions. The modulation characteristics of the inverter are evaluated for four typical unbalanced input scenarios, and the corresponding input current and voltage ripples are analyzed to identify key trends. The results reveal that double-frequency components (i.e., twice the fundamental frequency of the phase current) are generated by input unbalance. Additionally, input unbalance causes an increase in the high-frequency (i.e., switching frequency level) input current of the inverter. A comparison of capacitor electric stress under balanced input and unbalanced input is conducted. Simulation and experimental results validate the accuracy of the theoretical analysis. The findings provide valuable insights for designing and operating five-phase inverters under unbalanced input conditions.</p>