A power generator includes a container having a cross section suitable for wearing by a person, the container including a nano-porous insulation. A fuel cell and fuel cell cartridge are disposed within the container. Power management electronics are supported by the container and coupled to the fuel cell. A charge storage device is supported by the container and electrically coupled to the power management electronics and the fuel cell. A connector is supported by the container and coupled to the charge storage device to distribute power to one or more electrical loads.