Method for efficiency-controlled operational management for a storage system for a photovoltaic system , wherein the photovoltaic system comprises, as components, at least one solar generator , the storage system , an energy management system and a household connection and a grid connection , wherein the method has the following steps of: reading in present characteristic data relating to the photovoltaic system , wherein the present characteristic data represent production values and consumption values and a state of charge of the storage system in a present interval of time, wherein the present interval of time is a time span within a period between a present time and a time in the future; determining a multiplicity of possible energy flows between the components of the photovoltaic system for the present interval of time using the present characteristic data, and determining an expected value for each energy flow of the multiplicity of possible energy flows using a power requirement parameter, which describes supply and demand in the power grid, and the multiplicity of possible energy flows , wherein the expected value combines an electrical energy or an electrical power with the power requirement parameter, wherein the power requirement parameter is made available to the photovoltaic system in order to control grid feed-in in a needs-oriented manner, wherein the expected value assigned to the state of charge of the storage system in a present interval of time corresponds to a negative expected value for a future interval of time, and wherein only the power requirement parameter for charging the store from the grid is assessed twice in order to determine the expected value, and selecting an energy flow from the multiplicity of possible energy flows for the present interval of time, wherein the expected value for the present interval of time is at a maximum, wherein the energy flow determines the efficiency-controlled operational management. reading in present characteristic data relating to the photovoltaic system , wherein the present characteristic data represent production values and consumption values and a state of charge of the storage system in a present interval of time, wherein the present interval of time is a time span within a period between a present time and a time in the future; determining a multiplicity of possible energy flows between the components of the photovoltaic system for the present interval of time using the present characteristic data, and determining an expected value for each energy flow of the multiplicity of possible energy flows using a power requirement parameter, which describes supply and demand in the power grid, and the multiplicity of possible energy flows , wherein the expected value combines an electrical energy or an electrical power with the power requirement parameter, wherein the power requirement parameter is made available to the photovoltaic system in order to control grid feed-in in a needs-oriented manner, wherein the expected value assigned to the state of charge of the storage system in a present interval of time corresponds to a negative expected value for a future interval of time, and wherein only the power requirement parameter for charging the store from the grid is assessed twice in order to determine the expected value, and selecting an energy flow from the multiplicity of possible energy flows for the present interval of time, wherein the expected value for the present interval of time is at a maximum, wherein the energy flow determines the efficiency-controlled operational management. <EOS>