Prediction of a voltage dip in a motor vehicle

A motor vehicle, comprising:

• at least one electrical voltage source;
• an energy store;
• at least one voltage source;
• a vehicle electrical system, wherein the at least one electrical voltage source and the energy store are connected in a parallel circuit to the vehicle electrical system, the at least one electrical voltage source and the energy store provide a supply current for operating a load, and wherein the energy store neither receives a charging current nor discharges generated power if a vehicle electrical system voltage of the vehicle electrical system is greater than a predetermined maximum value;
• and
• a control unit that predicts a voltage drop before a planned start of the load, wherein the con trot unit is configured to:
• ascertain a value of the supply current expected to be required after the start of the load;
• and
• based on an instantaneous value of the vehicle electrical system voltage, ascertain a proportion of the supply current that the at least one electrical voltage source generates as a source current without the energy store until the vehicle electrical system voltage has fallen to the predetermined maximum value.