Energy storage on the user side has been widely considered and used in recent years because it can effectively transfer load, reduce the difference in power consumption between peaks and valleys, and reduce user electricity costs. However, because the energy storage system itself is relatively expensive, how to optimize the allocation of energy storage capacity has become one of the key issues. First, based on the user-side two-part electricity price system, an energy storage optimization configuration model is established with the goal of obtaining the maximum monthly benefits after installing. This considers the impact of social development on energy storage. Then considering factors such as holidays and weather conditions, a user-side energy storage configuration decision-making method suitable for multiple scenarios is proposed to meet the individual needs of users. Finally, the historical load data of four typical users are selected for simulation with CPLEX solver, and the rationality and economy of the energy storage configuration are analyzed and discussed. The simulation results show that the optimization configuration method can improve the economy and the accuracy of the model, and it also provides a reference for the commercial application of energy storage by different users. This work is supported by the National Natural Science Foundation of China for International Cooperation and Exchanges (No. 52061635102) and the Science and Technology Project of State Grid Corporation of China (No. 52573520000F).