"Inverter imbalance" refers to a condition where the output of an inverter (a device that converts direct current (DC) to alternating current (AC)) is not balanced across its phases. This typically occurs in three-phase inverters, where the voltages or currents in the three output phases (commonly denoted as A, B, and C) are not equal or not 120 degrees out of phase with each other as they should be in a perfectly balanced system.