Abstract: Disclosed is a power control method and a power control apparatus. The power control method comprises the steps of: a first charge comparison step for receiving charge information of supplied power, and comparing the charge of the supplied power with a preset reference charge; and a second charge comparison step for comparing the charge of the supplied power with the preset lowest charge. The method comprises the steps of: a first power quantity comparison step for confirming a stored power quantity within a power storage unit, and comparing the stored power quantity with a preset reference power quantity; and a second power quantity comparison step for comparing the stored power quantity with a preset power quantity demand. Further, the method comprises a control step for selecting one of externally supplied power and internally stored power as the usage power for the customer, through at least one of a charge comparison step and the power quantity comparison step.

Abstract: A multi-unit fuel cell system that includes a common-use reforming unit configured to supply hydrogen to multiple fuel cell units that are installed in multiple units, such as apartments within an apartment building. In one example embodiment, a fuel cell system including a common-use reforming unit and multiple fuel cell units is disclosed. The common-use reforming unit is configured to supply hydrogen to the plurality of fuel cell units. Each fuel cell unit includes a stack unit, an air supplying unit, an integral heat exchange unit, a hot-water supplying unit, an auxiliary heat supplying unit, and an electric output unit.

Abstract: A multi-unit fuel cell system that includes a common-use reforming unit configured to supply hydrogen to multiple fuel cell units that are installed in multiple units, such as apartments within an apartment building. In one example embodiment, a fuel cell system including a common-use reforming unit and multiple fuel cell units is disclosed. The common-use reforming unit is configured to supply hydrogen to the plurality of fuel cell units. Each fuel cell unit includes a stack unit, an air supplying unit, an integral heat exchange unit, a hot-water supplying unit, an auxiliary heat supplying unit, and an electric output unit.

Abstract: A system for supplying energy to a plurality of building units includes a plurality of fuel cells installed in a plurality of building units, a common reformer which generates hydrogen from fuel, a pipe system which supplies hydrogen generated by the common reformer to each of the plurality of fuel cells, and a plurality of converters which convert electricity generated by the plurality of fuel cells into electricity which is supplied to each of the plurality of building units.

Abstract: A fuel cell system that includes a heat exchange unit which can control the temperature of the fuel and/or the air supplied to a stack unit. In one example embodiment, a fuel cell system includes a reforming unit for generating hydrogen floating gas, and supplying the hydrogen floating gas through a fuel supplying line. The reforming unit includes a burner. The fuel cell system also includes a stack unit for generating electric energy by an electrochemical reaction between air and the hydrogen floating gas. The fuel cell system also includes a heat exchange unit. The heat exchange unit includes a casing having an airtight interior to which off gas generated in the burner is supplied. A portion of the fuel supplying line is arranged to pass through the interior of the casing.

Abstract: A heating and hot-water supplying system which includes a fuel cell and a boiler installed in either one of a home or a building. The fluid may be heated by reaction heat from the fuel cell and combustion heat from the boiler, and circulated to heat an inside of a floor of either one of the home or the building. Further, the reaction heat from the fuel cell and the combustion heat from the boiler may be used to heat water, thereby providing hot water to either one of a lavatory or a kitchen of the home or the building.

Abstract: A purge system for a fuel cell generates an inactive gas by complete combustion of a fuel supplied to a stack unit, and allows the stack unit to be purged using the inactive gas at the time of starting or stopping the system, so that the purging of the system can be carried out without purge equipment such as a nitrogen tank, and accordingly the safety for installation and maintenance of the system can be improved, and the convenience of use can be improved because there is no need to replace a purge gas tank.

Abstract: A fuel cell having a charging unit, comprising: a fuel supplying unit for supplying a fuel; a reformer for generating hydrogen containing gas including hydrogen by receiving a fuel from the fuel supplying unit; a stack unit for generating electricity and heat by an electrochemical reaction between the hydrogen generated from the reformer and additionally-supplied oxygen; a power converter installed at one side of the stack unit, for converting a current generated from the stack unit; and a charging unit installed at one side of the power converter, for charging an electric appliance.