Abstract: A device for determining an operating time of a consumer coupled to a power station and energy/storage device, having a first determining device to determine energy production from the station during a time, a second determining device to determine energy consumption of the consumer during a time, a third determining device to determine energy stored in the storage device for operating the consumer, and a prediction device to determine/display, considering the determined energy production, the determined stored energy, and the determined energy consumption, an operating time that the consumer is operatable by the energy from the station and by the stored energy, and/or having a control device to determine a consumer operating time and to adapt stored energy for operating the consumer, considering the determined energy production, the determined stored energy, and the determined energy consumption, the adaptation occurring so that the consumer is operatable for the operating time.

Abstract: The invention relates to a method and a device for monitoring the fuel supply of a fuel cell system and for protecting said fuel cell system against damage or destruction, if no fuel or insufficient fuel is supplied to the fuel cell system. If the flow of fuel is insufficient for supplying fuel to the fuel cell system or if the fuel reserve falls below a predetermined value, a signal will be output.

Abstract: The invention relates to a method for controlling the fluid balance in an anode circuit of a fuel cell system. In this method, at least the gases discharged on the cathode side are cooled in a condensing device in order to obtain a condensed liquid, and the condensed liquid is fed to the anode circuit of the fuel cell system. It further relates to a fuel cell system designed according to the principles of the inventive method.

Abstract: The invention relates to heat dissipation with devices with an internal energy supply device. A housing device for an electrical load and an energy supply device are provided, especially a laptop housing, having a device for heat dissipation in order to transport the heat generated by the energy supply device by means of at least one flowing medium to at least one outer surface of the housing device and to discharge it via the outer surface.