A controller and system with a controller that is configured to determine the energy input to an energy storage device at any time and control the activation of one or more electrical load devices. Each load device has an associated load profile data list that includes parameters pertaining to an energy storage threshold parameter and a nominal energy consumption parameter. The controller activates one load devices and controls the power input to the energy storage device by a proportional amount when the energy input to the energy storage device exceeds the nominal energy consumption parameter of the load device.