The Center for Electromechanics at The University of Texas at Austin (CEM-UT) has carried out several major experimental programs using homopolar generator (HPG)-charged inductors; namely, the fast discharge experiment (FOX) field coil experiments, the General Dynamics single-shot railgun, and the compact homopolar generator/inductor (CHPG/I) experiments. As a result of this experimental and theoretical work, CEM-UT experience with modeling and predicting the performance of HPG-charged inductive energy store systems has been refined. This paper presents techniques found useful for estimating and modeling of HPG inductive energy store systems.