Abstract: A power system and method of supplying electrical power to a load is disclosed and wherein the invention includes a plurality of serially electrically coupled DC power sources each having an electrical power output which is supplied to a load; a charge storage device electrically coupled with the plurality of DC power sources, and having a maximum electrical charge which is substantially equal to the electrical power output of one of the plurality of DC power sources; and means for electrically decoupling at least one of the plurality of DC power sources while simultaneously electrically discharging the charge storage device to the load.

Abstract: An uninterruptible power supply and method for supplying uninterruptible power to a load is described and which includes a source of substantially continuous electrical power for energizing a load which has an electrical power demand; an ultracapacitor which stores electrical energy and which meets the electrical power demand of the load upon an interruption of the substantially continuous electrical power source; and a fuel cell for supplying electrical power to the load following the at least partial discharge of the ultracapacitor.