Enabling a truly optimized system SWaP performance, the Vicor high voltage BCM bus converter is1.8kW and 97%+ efficient, operating from a 500 to 800V_DC high-voltage bus to deliver an isolated 31.3 to 50.0V_DC low voltage in a remarkably small 4.4 x 1.4 x 0.4in. package. The power architecture utilizes the reverse operation feature of the BCM to create a single-phase or 3-phase AC ground supply that generates an output between 400 and 800V and then employs another BCM to convert the 800V back down to 48V in the UAV. This allows for a dramatically reduced size and weight of both the ground supply and UAV and a dramatically reduced diameter and weight of the tether. Inside the UAV, the 48V is distributed and can be efficiently down-converted to power the loads using flexible Vicor DC-DC solutions such as the DCM or PRM/VTM combination. The result is a much more flexible and capable system that can be transported by smaller or fewer vehicles or provide increased payload.