Energy-storage integrated application device and operation thereof

A method for operating an application system comprising one or more application devices and an application controller, the method comprising:

• in a first mode, controlling an AC power source to connect to the distribution line to provide power to an application device via the distribution line,
• in a second mode, controlling the AC power source to disconnect from the distribution line and enabling data transmission between the one or more application devices and between the one or more application devices and the application controller;
• wherein the application device stays in the second mode for a time period depending on the amount of data to be exchanged;
• in a third mode, controlling the AC power source to disconnect from the distribution line and enabling DC power transmissions between the one or more application devices.