A power supply system, comprising: a power conditioner configured to convert DC power supplied by a distributed power source into AC power and output the AC power; a storage cell unit configured to store electrical energy; and a charge-discharge unit configured to charge the storage cell unit, the charge-discharge unit being configured to convert the charged power in the storage cell unit into AC power and output the AC power, characterized in that the power conditioner comprises a grid-connected output part that is an output used for a grid connected operation and a grid independent outlet that is an output used for a grid independent operation, wherein the power conditioner is configured to perform the grid-connected operation during a normal state in which AC power is supplied by a commercial power supply, wherein the power conditioner is configured to perform the grid independent operation during a power failure state in which the supply of the AC power by the commercial power supply is stopped, wherein the power conditioner is configured to supply, to the charge-discharge unit, the AC power through the grid independent outlet in the grid independent operation, and wherein the charge-discharge unit comprises a DC conversion part that is configured to convert the AC power supplied by the power conditioner through the grid independent outlet in the grid independent operation into DC power, the charge-discharge unit being configured to charge the storage cell unit by using the DC power outputted by the DC conversion part, or to supply, to an appliance, the AC power supplied by the power conditioner through the grid independent outlet in the grid independent operation. a power conditioner configured to convert DC power supplied by a distributed power source into AC power and output the AC power; a storage cell unit configured to store electrical energy; and a charge-discharge unit configured to charge the storage cell unit, the charge-discharge unit being configured to convert the charged power in the storage cell unit into AC power and output the AC power, the power conditioner comprises a grid-connected output part that is an output used for a grid connected operation and a grid independent outlet that is an output used for a grid independent operation, wherein the power conditioner is configured to perform the grid-connected operation during a normal state in which AC power is supplied by a commercial power supply, wherein the power conditioner is configured to perform the grid independent operation during a power failure state in which the supply of the AC power by the commercial power supply is stopped, wherein the power conditioner is configured to supply, to the charge-discharge unit, the AC power through the grid independent outlet in the grid independent operation, and wherein the charge-discharge unit comprises a DC conversion part that is configured to convert the AC power supplied by the power conditioner through the grid independent outlet in the grid independent operation into DC power, the charge-discharge unit being configured to charge the storage cell unit by using the DC power outputted by the DC conversion part, or to supply, to an appliance, the AC power supplied by the power conditioner through the grid independent outlet in the grid independent operation.