A method of transferring wireless power to an electric vehicle (112,412,824), the method comprising: initiating a charging cycle of a wireless power transfer system (100, 200, 300), the wireless power transfer system (100, 200, 300) comprising a base pad having at least one base system induction coil (104a, 204,304) and the electric vehicle (112,412,824) comprising a vehicle pad having at least one electric vehicle induction coil (116, 216,316), the charging cycle characterised by a plurality of operational states comprising: at least one initialization state during which a wireless power link sufficient for charging is established between the wireless power transfer system (100, 200, 300) and the electric vehicle (112,412,824), the at least one initialization state comprising at least one alignment state during which alignment of the electric vehicle (112,412,824) with the wireless power transfer system (100, 200, 300) is performed, and alignment of the electric vehicle (112,412,824) with the wireless power transfer system (100, 200, 300) comprising alignment of the vehicle pad with the base pad to configure the base pad and the vehicle pad for the wireless power transfer, wherein, during the at least one alignment state, the base pad transmits power to the vehicle pad at a power level sufficient to align the base pad with the vehicle pad; and at least one charging state during which wireless power transfer from the wireless power transfer system (100, 200, 300) to the electric vehicle (112,412,824) is performed; generating a first timestamp indicating a start time of the wireless power transfer in response to entering the at least one charging state; and generating a second timestamp indicating an end time of the wireless power transfer. initiating a charging cycle of a wireless power transfer system (100, 200, 300), the wireless power transfer system (100, 200, 300) comprising a base pad having at least one base system induction coil (104a, 204,304) and the electric vehicle (112,412,824) comprising a vehicle pad having at least one electric vehicle induction coil (116, 216,316), the charging cycle characterised by a plurality of operational states comprising: at least one initialization state during which a wireless power link sufficient for charging is established between the wireless power transfer system (100, 200, 300) and the electric vehicle (112,412,824), the at least one initialization state comprising at least one alignment state during which alignment of the electric vehicle (112,412,824) with the wireless power transfer system (100, 200, 300) is performed, and alignment of the electric vehicle (112,412,824) with the wireless power transfer system (100, 200, 300) comprising alignment of the vehicle pad with the base pad to configure the base pad and the vehicle pad for the wireless power transfer, wherein, during the at least one alignment state, the base pad transmits power to the vehicle pad at a power level sufficient to align the base pad with the vehicle pad; and at least one charging state during which wireless power transfer from the wireless power transfer system (100, 200, 300) to the electric vehicle (112,412,824) is performed; at least one initialization state during which a wireless power link sufficient for charging is established between the wireless power transfer system (100, 200, 300) and the electric vehicle (112,412,824), the at least one initialization state comprising at least one alignment state during which alignment of the electric vehicle (112,412,824) with the wireless power transfer system (100, 200, 300) is performed, and alignment of the electric vehicle (112,412,824) with the wireless power transfer system (100, 200, 300) comprising alignment of the vehicle pad with the base pad to configure the base pad and the vehicle pad for the wireless power transfer, wherein, during the at least one alignment state, the base pad transmits power to the vehicle pad at a power level sufficient to align the base pad with the vehicle pad; and at least one charging state during which wireless power transfer from the wireless power transfer system (100, 200, 300) to the electric vehicle (112,412,824) is performed; generating a first timestamp indicating a start time of the wireless power transfer in response to entering the at least one charging state; and generating a second timestamp indicating an end time of the wireless power transfer.