Methods and systems for managing state of charge of an energy storage system during off-grid operation

An electrical system, comprising:

• an energy control system electrically coupled to a plurality of backup loads;
• a photovoltaic (PV) power generation system electrically coupled to the energy control system, the PV power generation system configured to generate power;
• and
• an energy storage system electrically coupled to the energy control system, the energy storage system comprising:
• a battery configured to store the power generated by the PV power generation system and configured to discharge stored power to the energy control system;
• and
• a storage converter electrically coupled to the battery and electrically coupled to the energy control system,
• wherein the energy storage system is configured to operate according to a mode of operation of a plurality of modes of operation, wherein the plurality of modes of operation include:
• a normal mode, wherein the battery and the storage converter are activated to discharge stored power to the energy control system, wherein the normal mode operates with a DC bus and AC bus that are each charged, and
• a hibernation mode, wherein the storage converter is deactivated to prevent the discharge of stored power from the energy storage system to the energy control system, wherein the hibernation mode operates with the DC bus being charged and the AC bus being shut off, and
• wherein the energy control system is configured to select the mode of operation.

A method, comprising:

• receiving electronic data from an electrical system;
• detecting a current time of day;
• determining a mode of operation of a plurality of modes of operation for an energy storage system based on the current time of day and the electronic data, wherein the plurality of modes of operation include:
• a normal mode, wherein a battery and a storage converter of the energy storage system are activated to discharge stored power to an energy control system, wherein the normal mode operates with a DC bus and AC bus that are each charged, and
• a hibernation mode, wherein the storage converter is deactivated to prevent the discharge of stored power from the energy storage system to the energy control system, wherein the hibernation mode operates with the DC bus being charged and the AC bus being shut off;
• and
• selecting the mode of operation for the energy storage system.