NOVELTY - The power control device has a voltage-regulation circuitry that couples power from power source (5) to load. The load receives power at a first and a second power-reception level which is greater than first level. A signaling circuitry signals circuitry of the load of a power-reception level. A resetting circuitry reset sthe load when the power source is incapable of providing sufficient power to the load. The resetting circuitry periodically resets the load to the second power reception level when the load receives power at the first power-reception level.    USE - Power control device used in photovoltaic (PV) generator, solar panel, crank generator, thermoelectric generator and fuel cell used in car for generating power to battery powered mobile devices such as cellphone, radio, light, laptop, camera, smartphone, MPEG audio layer-3 (MP3) player, and personal electronics and automobile starters. Can also be used for selling power from personal solar panels to friends and neighbors for phone charging.    ADVANTAGE - The smart load is reset to optimize load current. The addition of an intuitive power display human interface increases the user's knowledge and helps the user to have empirically derived understanding about the overall state of power transmission in the system, so that overall usability of power source is increased. The optimized thermal contact and mechanical stability throughout the lifetime of the system is ensured, so that system is allowed to better endure thermal cycling, general use and transportation. The regulation circuit estimates an amount of power available, and configures an interface to provide a power-available indication to the smart load, so that amount of power available is effectively to the load. The smart load recognizes that power is present and determines an amount of power available by reading voltages of data pins of the interface with the regulation circuit, or by interacting serially with the regulation circuit when power is provided to the smart load.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) a method for operating a smart load with a charging system; and    (2) an apparatus for operating a smart load with a charging system.    DESCRIPTION OF DRAWING(S) - The drawing shows a circuit diagram of a power control device.    Solar panel (1)    Power source (5)    Common ground (12)    Pin (14)    User switch (62)