A wireless power transfer system for charging a battery positioned in a vehicle may include a primary side network, a secondary side network, detection coils, and a charge monitor controller. The secondary side network may be configured to receive power from the primary side network by way of inductively coupling between a transmitting coil of the primary side network and a receiving coil of the secondary side network. The detection coils may be coupled to magnetic cores provided with at least one of the primary side network or the secondary side network. The detection coils may output at least one voltage signal based on the inductively coupling between the transmitting coil and the receiving coil. The charge monitor controller may determine a system diagnosis status based on the at least one voltage signal from the detection coils.
