Abstract: A portable power manager device (100) includes a DC power bus (110) and a plurality of device ports (141, 142, and 143). A primary device port (143) is connectable to the DC power bus over a primary power channel that does not include a DC to DC power converter. A plurality of secondary device ports (141, 142) is each connectable to the DC power bus over a different reconfigurable power channel (151, 152). Each reconfigurable power channel includes a single one-way DC to DC power converter (220, 221). Each reconfigurable power channel is configurable by a digital data processor as one of three different circuit legs (230, 232, and 234). Leg (230) provides output power conversion. Leg (232) provides input power conversion. Leg (234) provides bi-directional power exchange without power conversion.