The paralleling operating mode has near infinite scalability both for energy storage and power. . The energy storage power supply with parallel function is set to standalone mode, and the PAR code is 27 if it is adjusted to parallel mode. 500/480 battery energy storage system (BESS) was identified as the ideal solution due to its. . The current sharing circuit or, load sharing circuit, is the ability to manage the output current evenly across all active power supplies to greatly reduce stresses on each power supply and allowing them to run cooler which results in higher reliability of the active power supplies.