according to an alternative embodiment control system 50 compares incoming power to outgoing power to determine if sufficient power is available to maintain the operation of control system 50 if there is not sufficient power control system 50 is disconnected from the power management system 650 preferably energy storage element 660 is capable of holding a charge with minimal leakage when disconnected from the load control system 50 providing energy storage element 660 that is capable of maintaining a charge with minimal leakage may allow energy storage element 660 to meet the electrical power requirements of control system 50 after photovoltaic cells 602 have not been exposed to ambient light for an extended period of time e g a weekend etc this will eliminate the need to recharge energy storage element 660 e g by a supplemental power source and or by photovoltaic cells 602 etc or at least reduce the time required to recharge energy storage element 602 when the ambient light returns and a user seeks to use fixtures 14 of lavatory system 10 when voltage detector 670 measures a voltage at or above the predetermined baseline voltage switch 680 reconnects power management system 650 to control system 50 power management system 650 is further shown as including voltage regulator 690 adapted for receiving a first voltage from photovoltaic cells 602 and providing a second voltage to control system 50 according to an exemplary embodiment voltage regulator 690 is capable of providing a relatively stable operating voltage to control system 50 according to an exemplary embodiment voltage regulator 690 is shown schematically as a dc to dc converter as can be appreciated the input and output voltages may vary in alternative embodiments as for the activation of the one or.