APPARATUS HAVING AT LEAST ONE FUEL CELL

The invention relates to a device () having at least one fuel cell () and a DC/DC converter () assigned to the latter. A variable voltage generated in the fuel cell () is converted, by means of the DC/DC converter (), into a DC voltage for a system () to be supplied. The DC/DC converter () is designed to capture internal characteristic variables of the fuel cell (). Operating states of the fuel cell () are captured and/or controlled in dependence on these characteristic variables.