A method for initial setup of an energy storage system suitable for an installation environment when installing the energy storage system comprises: connecting an energy management system and a user terminal with a USB cable; activating, by the user terminal, a USB network through USB tethering; allocating, by the energy management system, a preset static IP to the USB network; accessing, by the user terminal, a setting server of the energy management system using the static IP; and performing, by the user terminal, initial setup of the energy storage system in the setting server.