Abstract: An electrical power generator comprising at least one fuel cell and at least one capacitor electrically coupled together in parallel is operated in a manner that reduces stress on the fuel cell and prolongs fuel cell operating life. The operation comprises: monitoring a current drawn by a load; monitoring a voltage across the capacitor; and operating the fuel cell to generate an electrical output within a target output range when either the monitored current or voltage are within a respective selected current and voltage range, the fuel cell output supplying the load and/or recharging the capacitor. The capacitor is configured to discharge stored electrical energy to the load when the load exceeds the target output range.

Abstract: A fuel cell fluid management system that transfers water vapor from a fuel cell stack's oxidant exhaust to the fuel cell stack's fluid supplies through membrane tubes; that coalesces and separates liquid water from the fuel cell's fluid exhaust streams for removal to the environment; that transfers heat from the fuel cell stack to the fluid supplies, and that disposes of purged fuel cell fuel. The fluid management system is shaped to close couple to the fluid ports of a corresponding fuel cell stack.