An online energy audit system based on Electromechanical to Internet of Things (EM2IoT) and for use in a building, comprising at least one versatile device and data management unit (DMU) adapted and configured for connecting, interacting, intercommunicating with each of energy metering devices, energy consuming devices, and/or environmental sensors installed in the building and manipulating first data received and transmitted therebetween by making use protocols including RS232, RS485, MODBUS, RTU, BACnet, Lonworks, KNX, M-BUS, and/or CAN; and for outputting and sending a second data derived from the first data in a dedicated format with TCP/IP protocol and/or UDP/IP protocol to a remote server or control management apparatus for performing system control and data analysis operations for enabling an online and real-time energy audit for the building.
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