An apparatus comprising: a first, a second, and a third direct current, DC, to alternating current, AC, three phase inverter (109M,109R,109L), wherein each inverter comprises: a plurality of AC output terminals comprising: a first phase output terminal, a second phase output terminal and a third phase output terminal; the apparatus further comprising: a junction box comprising: a plurality of phase input terminals, the plurality of phase input terminals comprising a first phase input terminal (L1/204), a second phase input terminal (L2/204), and a third phase input terminal (L3/204); wherein the first phase input terminal (L1/204) is connected to: the first phase output terminal of the first inverter, the first phase output terminal of the second inverter, the first phase output terminal of the third inverter, and a first phase output terminal (L1/25) of the junction box; wherein the second phase input terminal (L2/204) is connected to: the second phase output terminal of the first inverter, the third phase output terminal of the second inverter, the second phase output terminal of the third inverter, and a second phase output terminal (L2/25) of the junction box; and wherein the third phase input terminal (L3/204) is connected to: the third phase output terminal of the first inverter, the second phase output terminal of the second inverter, the third phase output terminal of the third inverter, and a third phase output terminal (L3/25) of the junction box; and wherein each of the inverters (109M,109R,109L) is configured to sense a phase parameter between its respective phase output terminals (L1,L2,L3), wherein the phase parameter is one of phase difference and phase sequence; the apparatus further comprising a controller configured to receive the sensed phase parameter data from each of the inverters, and to determine the relative position of the second inverter with respect to the other two inverters (109L,109M) based on the received sensed phase parameter data. a first, a second, and a third direct current, DC, to alternating current, AC, three phase inverter (109M,109R,109L), wherein each inverter comprises: a plurality of AC output terminals comprising: a first phase output terminal, a second phase output terminal and a third phase output terminal; the apparatus further comprising: a junction box comprising: a plurality of phase input terminals, the plurality of phase input terminals comprising a first phase input terminal (L1/204), a second phase input terminal (L2/204), and a third phase input terminal (L3/204); wherein the first phase input terminal (L1/204) is connected to: the first phase output terminal of the first inverter, the first phase output terminal of the second inverter, the first phase output terminal of the third inverter, and a first phase output terminal (L1/25) of the junction box; the first phase output terminal of the first inverter, the first phase output terminal of the second inverter, the first phase output terminal of the third inverter, and a first phase output terminal (L1/25) of the junction box; wherein the second phase input terminal (L2/204) is connected to: the second phase output terminal of the first inverter, the third phase output terminal of the second inverter, the second phase output terminal of the third inverter, and a second phase output terminal (L2/25) of the junction box; and the second phase output terminal of the first inverter, the third phase output terminal of the second inverter, the second phase output terminal of the third inverter, and a second phase output terminal (L2/25) of the junction box; and wherein the third phase input terminal (L3/204) is connected to: the third phase output terminal of the first inverter, the second phase output terminal of the second inverter, the third phase output terminal of the third inverter, and a third phase output terminal (L3/25) of the junction box; and wherein each of the inverters (109M,109R,109L) is configured to sense a phase parameter between its respective phase output terminals (L1,L2,L3), wherein the phase parameter is one of phase difference and phase sequence; the apparatus further comprising a controller configured to receive the sensed phase parameter data from each of the inverters, and to determine the relative position of the second inverter with respect to the other two inverters (109L,109M) based on the received sensed phase parameter data. the third phase output terminal of the first inverter, the second phase output terminal of the second inverter, the third phase output terminal of the third inverter, and a third phase output terminal (L3/25) of the junction box; and wherein each of the inverters (109M,109R,109L) is configured to sense a phase parameter between its respective phase output terminals (L1,L2,L3), wherein the phase parameter is one of phase difference and phase sequence; the apparatus further comprising a controller configured to receive the sensed phase parameter data from each of the inverters, and to determine the relative position of the second inverter with respect to the other two inverters (109L,109M) based on the received sensed phase parameter data.