Redox flow battery system and method for operating redox flow battery system

A method for operating a redox flow battery system, the method comprising:

• circulating, to at least one redox flow charging cell connected to at least one power source type and configured to perform charging with power from the at least one power source type, an electrolyte that is charged with the power only from one power source type and charging the electrolyte with the power;
• switching an electrolyte that circulates in the redox flow charging cell from the electrolyte that is charged with the power only from the one power source type to an electrolyte that is charged with the power from at least two power source types;
• charging a switched electrolyte, the electrolyte being charged with the power from the at least two power source types, with the power by the redox flow charging cell;
• and
• circulating one of the electrolyte that is charged with the power only from the one power source type and the electrolyte that is charged with the power from the at least two power source types to a redox flow discharging cell and discharging the power with which charging is performed from the redox flow discharging cell.