Energy storage system

An energy storage system to be coupled to an electric power system for generating a system power, the energy storage system comprising:

• a battery for providing a battery power;
• and
• a converter coupled to a power generator and the battery in parallel, the power generator for generating an electric power,
• wherein the converter is configured to boost or drop a voltage of at least one of the electric power, the battery power, or the system power.

An energy storage system comprising:

• a battery coupleable to a power generator for generating an electric power, the battery being configured to store the electric power;
• an inverter for transforming between direct current (DC) power and alternating current (AC) power;
• and
• a converter having a first terminal coupled to the inverter and a second terminal coupleable to at least one of the power generator or the battery, the converter being configured to boost or drop a voltage at one of the first terminal or the second terminal to output to the other one of the first terminal or the second terminal.