An electrical power system may comprise a first plurality of power sources, a first collector bus configured to receive power from the plurality of power sources, an unregulated DC bus configured to receive power from the first collector bus, a regulated high voltage direct current (HVDC) bus configured to receive power from the unregulated DC bus, and a first power distribution unit (PDU) configured to receive power from the regulated HVDC bus. The regulated HVDC bus may be configured to supply power to a high voltage load. The first plurality of power sources may comprise a first solar array, a first supercapacitor, and/or a first battery.