NOVELTY - The system (600) has a fuel cell segment (602) connected to a fuel cell bus (604). The fuel cell segment provides power to the fuel cell bus. Variable frequency drives (606, 608) are connected to the fuel cell bus. The variable frequency drives receive the power from the fuel cell bus, and generate variable frequency power output. Support equipments (610, 612) i.e. fuel exhaust recycle blower, are connected to the frequency drives. The support equipments receive the variable frequency power output from the variable frequency drive. A grid power source (618) is connected to the cell bus.    USE - Modular fuel cell system for high performance computing applications utilized in enterprises and a small and medium business (SMB) market.    ADVANTAGE - The system can split an anode exhaust in a hot box that is behind a anode cooler so as to increase efficiency due to reduced anode recycle blower power, thus reducing mechanical complexity in the hot box due to fewer fluid passes. The system can reduce a heat exchange area of the anode cooler when smaller amount of fuel exhaust is provided into the anode cooler. The system can eliminate the external ATO fuel to reduce cost as a separate ATO air blower is not required and less ATO catalyst/catalyst support is enough due to higher average temperature of the anode and cathode exhaust streams compared to fresh external fuel and air streams, reduce cathode side pressure drop due to lower cathode exhaust flows, increase efficiency due to elimination of the power required to drive the ATO air blower and reduced main air blower power due to lower cathode side pressure drop, and reduce harmful emissions from the system when the ATO operates with excess air, and provide potentially stable ATO operation for fuel oxidation after start-up. The system can provide a powering support equipment from a fuel cell source so as to mitigate and reduce exposure to ground faults.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for operating a fuel cell system.    DESCRIPTION OF DRAWING(S) - The drawing shows a block diagram of a fuel cell system.    Modular fuel cell system (600)    Fuel cell segment (602)    Fuel cell bus (604)    Variable frequency drives (606, 608)    Support equipments (610, 612)    Grid power source (618)