A system for monitoring a load power, comprising:
- an external electric power supply source;
- a first renewable energy source configured to charge or discharge electric power;
- a second renewable energy source configured to generate electric power;
- a distribution board configured to distribute the electric power applied from the external electric power supply source or the first renewable energy source to an electric device;
- a first power metering device configured to sense electric energy of one of the external electric power supply source and the first renewable energy source;
- a second power metering device separate from the first power metering device, wherein the second power metering device is configured to sense electric energy distributed to the electric device by the distribution board;
- a third power metering device separate from the first and second power metering devices and connected between the first renewable energy source and the second renewable energy source, wherein the third power metering device is configured to sense electric energy applied to the first renewable energy source from the second renewable energy source;
- and
- a monitoring server configured to collect first electric energy data sensed by the first power metering device, second electric energy data sensed by the second power metering device, and third electric energy data sensed by the third power metering device, and monitor the load power based on the collected electric energy data,
- wherein the second electric energy data includes information about electric energy applied to the electric device and an electric energy consumption pattern consumed in the electric device,
- wherein the monitoring server estimates an operation mode of the first renewable energy source based on the first electric energy data and the second electric energy data, and
- wherein the monitoring server estimates a charged amount or a discharged amount of the first renewable energy source based on the estimated operation mode of the first renewable energy source and the third electric energy data,
- wherein the charged amount is an amount charged in the first renewable energy source and the discharged amount is an amount discharged from the first renewable energy source, and
- wherein the charged amount is a sum of a first charge amount and a second charge amount, wherein when the first renewable energy source operates in a charging mode, the first charge amount is estimated based on the first electric energy data and the second charge amount is estimated based on the third electric energy data.