more additional seu units shown generally by the reference numeral 28 in a multi unit system i e two or more seu units 9 or 28 each seu unit 9 or 28 is connected in a parallel configuration onto the cable 97 due to relatively high power consumption the nature of the system is also that only one of the seu units 9 or 28 is active at a given time the active status of an seu 9 or 28 is addressed during the initial start up and through a command issued by the diu 101 at the well site at power up the diu 101 actively addresses one of the seu units 9 or 28 on the line and makes it the active node of the system to change to another seu 9 or 28 the diu 101 simply powers down the line to reset or resume at the next power up another seu 9 or 28 may be addressed using this mode of operation power is directed to one seu 9 or 28 at a time and the system is capable of hosting many seu units 9 and 28 on the line without gross voltage drop on the tec 39 s 97 or 98 due to heavy loads power harvesting 100 is achieved by correct vertical alignment of the seu 9 in relation to the wsu.