In a generator system having a fuel cell and a battery to which an output current is supplied from the fuel cell, the output current from the fuel cell is controlled in response to the energy charged in the battery, so that the stable supply of the current to the load can be ensured. As the load is increased,...http://www.google.co.uk/patents/US4839574?utm_source=gb-gplus-sharePatent US4839574 - Generator system utilizing a fuel cell
