Since many DC fast charging (DCFC) stations are currently low utilizied, they suffer financially from high demand charges and are difficult to operate as a business case. This study investigates a method to operate a multi-port DCFC station with power cap to mitigate high operation costs. 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 is quantified for several station designs and demand profiles. It is shown that by applying the proposed method, the operation costs can be less than 0.1 $/kWh without a significant decrease in service quality.