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 connected to the output of the at least one DC/DC converter , and a local load (48, LR1) connectable to the DC voltage link , 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 while letting a current from the fuel cell system flow through a charging resistor (CR1) 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 , connect the local load (48, LR1) to the DC voltage link when the voltage of the DC voltage link 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 has decreased to a safe level allowing the at least one DC/DC converter to be started safely. a DC voltage link connected to the output of the at least one DC/DC converter , and a local load (48, LR1) connectable to the DC voltage link , 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 while letting a current from the fuel cell system flow through a charging resistor (CR1) 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 , connect the local load (48, LR1) to the DC voltage link when the voltage of the DC voltage link 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 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 while letting a current from the fuel cell system flow through a charging resistor (CR1) 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 , connect the local load (48, LR1) to the DC voltage link when the voltage of the DC voltage link 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 has decreased to a safe level allowing the at least one DC/DC converter to be started safely. <EOS>