A fuel cell power system comprising a fuel cell system having one or more voltage outputs, at least one DC/DC converter having an output, an input, an output capacitor (C, 46) and a controllable switch (S, 45), the input being connectable to one of the voltage outputs of the fuel cell system, a DC voltage link (17, 47) connected to the output of the at least one DC/DC converter, and a local load (48, LR1) connectable to the DC voltage link (17, 47), wherein the local load is adapted to draw power from the fuel cell system to decrease the voltage of the fuel cell system, characterized in that the voltage rating of the at least one DC/ DC converter is lower than an open circuit voltage of the fuel cell system, and the fuel cell power system is adapted to: charge the capacitor (C, 46) and the DC voltage link (17, 47) while letting a current from the fuel cell system flow through a charging resistor and diodes of the at least one DC/DC converter prior to starting the at least one DC/DC converter, determine the voltage of the DC voltage link (17, 47), connect the local load (48, LR1) to the DC voltage link (17, 47) when the voltage of the DC voltage link (17, 47) exceeds a set limit for lowering the output voltage of the fuel cell system, and start the operation of the at least one DC/DC converter by operating the controllable switch (S, 45) after the voltage of the DC voltage link (17, 47) has decreased to a safe level allowing the at least one DC/DC converter to be started safely. a DC voltage link (17, 47) connected to the output of the at least one DC/DC converter, and a local load (48, LR1) connectable to the DC voltage link (17, 47), wherein the local load is adapted to draw power from the fuel cell system to decrease the voltage of the fuel cell system, characterized in that the voltage rating of the at least one DC/ DC converter is lower than an open circuit voltage of the fuel cell system, and the fuel cell power system is adapted to: charge the capacitor (C, 46) and the DC voltage link (17, 47) while letting a current from the fuel cell system flow through a charging resistor and diodes of the at least one DC/DC converter prior to starting the at least one DC/DC converter, determine the voltage of the DC voltage link (17, 47), connect the local load (48, LR1) to the DC voltage link (17, 47) when the voltage of the DC voltage link (17, 47) exceeds a set limit for lowering the output voltage of the fuel cell system, and start the operation of the at least one DC/DC converter by operating the controllable switch (S, 45) after the voltage of the DC voltage link (17, 47) has decreased to a safe level allowing the at least one DC/DC converter to be started safely. charge the capacitor (C, 46) and the DC voltage link (17, 47) while letting a current from the fuel cell system flow through a charging resistor and diodes of the at least one DC/DC converter prior to starting the at least one DC/DC converter, determine the voltage of the DC voltage link (17, 47), connect the local load (48, LR1) to the DC voltage link (17, 47) when the voltage of the DC voltage link (17, 47) exceeds a set limit for lowering the output voltage of the fuel cell system, and start the operation of the at least one DC/DC converter by operating the controllable switch (S, 45) after the voltage of the DC voltage link (17, 47) has decreased to a safe level allowing the at least one DC/DC converter to be started safely.