A power supply comprising a power stage, a monitoring stage and a user interface; wherein the power stage comprises: - a primary side with a primary electrolytic capacitor; - a secondary side with a secondary electrolytic capacitor; - a galvanic isolation element arranged to provide galvanic isolation between the primary side and the secondary side; - a rectifier stage arranged to provide rectified electric energy from the galvanic isolation element to the secondary electrolytic capacitor; - a primary temperature sensor and a secondary temperature sensor respectively arranged to sense temperatures of the primary electrolytic capacitor and the secondary electrolytic capacitor; - a voltage sensor arranged to sense an input voltage present at the primary side; - a current sensing element (142, 144) arranged to sense an output current from the secondary side; - wherein the monitoring stage comprises: - A/D conversion means arranged to receive information from each of the primary temperature sensor, secondary temperature sensor, the voltage sensor and the current sensing element (142,144); - logic means arranged to perform a set of predetermined calculations on the information received by the A/D conversion means, such that the set of predetermined calculations yield a lifetime estimate, an aging rate estimate and a current load level estimate for the power supply, wherein the logic means further comprises an operating statistics memory for storing history data based on results of the predetermined calculations; - presentation means for converting the lifetime estimate, aging rate estimate and current load level estimate to respective formats presentable via the user interface; - and wherein the user interface comprises: - indicator means, responsive to the presentation means, for presenting a first indication of the aging rate estimate, a second indication of the lifetime estimate, and third indication of the load level estimate. - a primary side with a primary electrolytic capacitor; - a secondary side with a secondary electrolytic capacitor; - a galvanic isolation element arranged to provide galvanic isolation between the primary side and the secondary side; - a rectifier stage arranged to provide rectified electric energy from the galvanic isolation element to the secondary electrolytic capacitor; - a primary temperature sensor and a secondary temperature sensor respectively arranged to sense temperatures of the primary electrolytic capacitor and the secondary electrolytic capacitor; - a voltage sensor arranged to sense an input voltage present at the primary side; - a current sensing element (142, 144) arranged to sense an output current from the secondary side; - wherein the monitoring stage comprises: - A/D conversion means arranged to receive information from each of the primary temperature sensor, secondary temperature sensor, the voltage sensor and the current sensing element (142,144); - logic means arranged to perform a set of predetermined calculations on the information received by the A/D conversion means, such that the set of predetermined calculations yield a lifetime estimate, an aging rate estimate and a current load level estimate for the power supply, wherein the logic means further comprises an operating statistics memory for storing history data based on results of the predetermined calculations; - presentation means for converting the lifetime estimate, aging rate estimate and current load level estimate to respective formats presentable via the user interface; - and wherein the user interface comprises: - indicator means, responsive to the presentation means, for presenting a first indication of the aging rate estimate, a second indication of the lifetime estimate, and third indication of the load level estimate.