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The need and advantages of the use of direct current voltage for domestic usage has been presented, however at a very-low dc voltage, the system suffers from voltage loss constraints and higher than usual load currents. Some of the parameters that cause load-induced voltage drops and the resultant ramifications to the usability of the electric network are discussed. The system needs a dynamic mechanism to control the voltage at any node each and every time a new load is connected or a load is removed from the system. This paper seeks to use smart house technology in the form of a smart grid, intelligent appliances and interactive power nodes to circumvent and mitigate these problems. The requirements and possible components that the smart grid will need to provide, are set forth. The use of power line communications over the DC electricity mains using CAN-bus or LIN-bus protocols is discussed.