Cell system with a control unit

It is a fuel cell system with a control unit (3) for controlling and / or regulating at least one fuel cell unit (1), wherein the fuel cell unit (1) at least one of the control unit (3) comprises monitored membrane and an electrical load (4) is provided, in particular an electric drive motor and / or at least one on-board network loads of a vehicle is proposed, wherein the humidification of the fuel cell membrane is improved. This is inventively achieved in that the control unit (3) comprises at least one supplemental electrical load (5, 7) for additional, at least dependent on the wetting of the membrane power extraction from the fuel cell unit (1).