Some mobile robots need to be connected to a base station via a tether cable. In applications such as underwater inspection, the tether allows for extended operation and high-bandwidth data transfer from cameras in otherwise noisy and harsh environments. The thinner and lighter the cable, the further and longer these robots can operate, but thinner cable limits power delivery from traditional PDNs. The Vicor modular approach enables higher voltages to be transmitted over the cable, reducing the cable size and weight without compromising power. The small size and low weight of Vicor modules also makes the robots lighter and able to increase payloads.