Emergency power supply for an elevator cabin

A method of operating an emergency power supply for an elevator cabin, comprising:

• determining a remaining power supply capacity of an energy storage device of the emergency power supply;
• determining a power demand of at least one electrical consumer in the elevator cabin;
• and
• predicting a period of time in which the energy storage device is capable of providing the electrical consumer with power, based on the determined remaining power supply capacity and the determined power demand.

An emergency power supply for an elevator cabin, comprising:

• an energy storage device configured to provide power to an electrical consumer during a failure of an elevator main power supply;
• and
• a control unit configured to:
• control operation of the energy storage device,
• determine a remaining power supply capacity of the energy storage device,
• determine a power demand of the electrical consumer, and
• predict a period of time in which the energy storage device is capable of providing the electrical consumer with power, based on the determined remaining power supply capacity and the determined power demand.

An elevator system, comprising:

• an elevator cabin configured to be moved within an elevator shaft;
• an emergency power supply configured to supply emergency power to at least one electrical consumer in said elevator cabin, said emergency power supply having:
• an energy storage device configured to provide power to the electrical consumer during a failure of an elevator main power supply, and
• a control unit configured to control operation of the energy storage device, determine a remaining power supply capacity of the energy storage device, determine a power demand of the electrical consumer, and predict a period of time in which the energy storage device is capable of providing the electrical consumer with power, based on the determined remaining power supply capacity and the determined power demand.