A power system comprising: a primary power source in electrical communication
with
a bridging power source, wherein the bridging power source is in electrical communication
with a bus; a secondary power source in electrical communication with the bus,
wherein the secondary power source comprises an electrochemical system including
a fuel cell. The system further includes: a controller electrically disposed between
and in operable communication with the bus and the bridging power source, and electrically
disposed between and in communication with the bus and the secondary power source.
The controller monitors the primary power source, initiates powering by the bridge
power source when the primary power source exhibits selected characteristics, initiates
the secondary power source when the bridging power source is depleted exceeding
a first selected threshold, and initiates interruption of powering by the secondary
power source.
