NOVELTY - A large non-bipolar fuel cell stack (100) is made from a sheets of porous plastic substrate. The sheets are electronically connected in parallel with air and/or oxidizing gas flowing between the arrays. The air flow manifold (39) has air channels (41) to provide heat and water exchange to the air electrode side of the fuel cell assemblies.    USE - To generate electrical power for use in household or buildings, as portable electrical generators, large power tools, utility power generators, telecommunications electrical powers, and vehicle power.    ADVANTAGE - The novel fuel cells provide a large power output compared to conventional heat engines. It is quiet in operation and less polluting. The electrically conductive separator plate is eliminated, thus manufacturing cost is reduced. Maintenance of the system may be carried out with minimal down time since individual fuel cell modules may be diagnosed and replaced within the stack while the system is running.    DETAILED DESCRIPTION - A large non-bipolar fuel cell stack configuration which delivers large amounts of power from tens of watts to megawatts comprises (i) a bus structure for fuel, electrical and airflow supply; (ii) plug-in fuel cell modules connected in parallel, side-to-side air flow channel; (iii) an external fuel control valve having an external fuel line coupling the fuel tank and the fuel control valve; (v) a fuel input coupler which is coupled by the external fuel line and the fuel control valve both positive and negative electrical connections. INDEPENDENT CLAIMS are also included for (A) alternative fuses and/or current limiting electronics which limit current flow in the fuel cells assembly in the event of an internal short circuit; (B) monitoring devices that are electrically linked to fuel control valves which monitors the output current of the individual fuel cell assembly; (C) a fuel control assembly which allows the selection of gases other than the reactant to clean the assembly, purge the fuel, and bleed the fuel lines; and (D) process of making the novel fuel cell using a reel-to-reel manufacturing technique.    DESCRIPTION OF DRAWING(S) - The figure shows an exploded view of a non-bipolar fuel cell stack.    Air flow manifold (39)    Air channels (41)    Fuel cell stack (100)