This document discusses modeling the cost analysis of using energy storage devices for peak shaving of renewable energy. It describes how renewable energy demand varies throughout the day and a system is needed to store excess renewable energy during non-peak hours and distribute it during peak hours. It reviews several proposed solutions using battery storage systems and optimized dispatch scheduling. It then introduces lithium manganese oxide batteries and shows Comsol simulations of their discharge. The document discusses developing a Comsol model and peak shaving model for these batteries and references literature on sizing battery storage for applications like voltage regulation and peak load shaving.