This paper demonstrates an equivalent circuit model for large scale WPT system with multiple receivers. Many articles have shown the method for determining optimum load impedance at receiver and power distribution in multiple- receiver environment. These analysis indicate requirement of an equivalent circuit when a transmitter side and receiver sides are coupled. This paper newly assumes that transmitter side is large scale so that equivalent circuit have to be combination of concentrated/distributed constant. Proposed model is experimentally investigated under the assumption that single parallel line feeder coupled with multiple receiver with different location.