Described herein are improved configurations for a wireless power transfer system with at least one adjustable magnetic resonator that may include a first magnetic resonator with a plurality of differently sized inductive elements, at least one power and control circuit configured to selectively connect to at least one of the plurality of differently sized inductive elements, one or more additional magnetic resonators separated from the first magnetic resonator, and measurement circuitry to measure at least one parameter of a wireless power transfer between the first magnetic resonator and the one or more additional magnetic resonators. One or more connections between the plurality of differently sized inductive elements and the at least one power and control circuit may be configured to change an effective size of the first magnetic resonator according to the at least one parameter measured by the measurement circuitry.