In this presentation, we propose a time-division scheduling method for wireless power transfer using multiple transmitters and evaluate its performance. Each subset of receivers assigned to a respective transmitter is defined as a cluster, which is formed based on the distances between transmitters and receivers. In the proposed method, slot allocation is performed by considering inter-cluster interference to improve power transfer performance. Through simulation experiments, we show that the proposed method improves both the minimum and average received power compared with methods that do not consider inter-cluster interference.