Since many DC fast charging (DCFC) stations are currently low utilized, they suffer financially from high demand charges and are difficult to operate as a business case. However, DCFC stations are necessary to provide coverage for long range travel and promote wide adoption of electric vehicles (EV). This study investigates a new method to design and operate a multi-port DCFC station with power cap in order to mitigate high operation costs while providing sufficient service quality to the customers. Different policies which distribute available power capacity between multiple charging ports in a fair manner are simulated and compared. The impact of the power cap policy on the quality of service (QoS) and operation costs is quantified. A method is introduced which penalizes insufficient QoS, and thus, allows to determine the optimal power cap level at which the QoS is still sufficient but the operations costs are reduced. The impact of other parameters such as the demand and the station architecture design on the optimal power cap is simulated and analyzed. Finally, the station design is optimized for maximum profit or minimum unit cost over the lifetime of the station operation. In summary, the thesis presents a new comprehensive approach on how to design and operate a DCFC station in order to achieve a good business case.