A power transmitter for a wireless power transfer system including at least one power receiver arranged to receive a power transfer from the power transmitter via a wireless inductive power transfer signal; the power transmitter comprising: a communicator arranged to communicate messages with the at least one power receiver; a configurer arranged to perform a configuration phase during power transfer initialization of a first power transfer with a first power receiver, the configurer being arranged to perform a configuration process during the configuration phase to determine a set of power transfer parameter values for the first power transfer in response to a communication with the first power receiver; a store arranged to store the set of power transfer parameter values and a first identity indication for the first power receiver, the first identity indication being received from the first power receiver; a power transfer controller arranged to perform the first power transfer during a power transfer phase using the set of power transfer parameter values; a first controller arranged to enter the power transmitter into a standby phase in response to a detection of an absence of the first power receiver during the power transfer phase; a maximum power level for the power transfer signal during the standby phase being lower than a maximum power level for the power transfer signal during the power transfer phase; a detector arranged to determine a presence of a candidate power receiver during the standby phase; the power transmitter characterized in further comprising: a duration comparator arranged to determine if a first duration from the detection of the absence of the first power receiver to the detection of the presence of the candidate power receiver exceeds a first threshold; an indication comparator arranged to determine if a candidate identity indication, being an indication of an identity of the candidate power receiver and being retrieved by the power transmitter in response to the detection of the presence of the candidate power receiver, matches the first identity indication; and an initialization processor arranged to initialize a second power transfer with the candidate power receiver using the set of stored parameter values subject to the first duration being below the first threshold and the candidate identity indication matching the first identity indication; and to discard the set of stored parameter values if the candidate identity indication does not match the first identity indication or if the first duration since exceeds the first threshold. a communicator arranged to communicate messages with the at least one power receiver; a configurer arranged to perform a configuration phase during power transfer initialization of a first power transfer with a first power receiver, the configurer being arranged to perform a configuration process during the configuration phase to determine a set of power transfer parameter values for the first power transfer in response to a communication with the first power receiver; a store arranged to store the set of power transfer parameter values and a first identity indication for the first power receiver, the first identity indication being received from the first power receiver; a power transfer controller arranged to perform the first power transfer during a power transfer phase using the set of power transfer parameter values; a first controller arranged to enter the power transmitter into a standby phase in response to a detection of an absence of the first power receiver during the power transfer phase; a maximum power level for the power transfer signal during the standby phase being lower than a maximum power level for the power transfer signal during the power transfer phase; a detector arranged to determine a presence of a candidate power receiver during the standby phase; a duration comparator arranged to determine if a first duration from the detection of the absence of the first power receiver to the detection of the presence of the candidate power receiver exceeds a first threshold; an indication comparator arranged to determine if a candidate identity indication, being an indication of an identity of the candidate power receiver and being retrieved by the power transmitter in response to the detection of the presence of the candidate power receiver, matches the first identity indication; and an initialization processor arranged to initialize a second power transfer with the candidate power receiver using the set of stored parameter values subject to the first duration being below the first threshold and the candidate identity indication matching the first identity indication; and to discard the set of stored parameter values if the candidate identity indication does not match the first identity indication or if the first duration since exceeds the first threshold.