Referring back to FIG. 5A, controller 306 maintains safety mode operation (step 53) until a communications signal, e.g. 100 Hz, is received by receiver/detector 207 from inverter 204 or signaling block 420. When the communications signal is received (decision block 505) indicating inverter 104 or 204 is connected and converting power, safety mode (step 53) of operation ends. When the communications signal is received (decision block 505), module 405 preferably enters a voltage control mode (step 55) and voltage output between wires 412,410 is slowly ramped up. Voltage continues to ramp up, typically as high as +60V until module 205,405 detects that current is being drawn by the inverter 104, 204 (step 507). When sufficient current is drawn (step 507), module 205, 405 begins normal operation, (step 57) e.g. for module 205, the normal mode is the maximum power point (MPP) tracking mode of converting DC power from its input to its output by maintaining maximum power at its input. The normal operation of transferring power is maintained as long as the communications signal, e.g. 100 Hz is received from inverter 204 or signal mechanism 420, and no other warning condition is present. If the communications signal is not detected, or another warning condition is present, the normal mode (step 57) is typically ended and power conversion of modules 405 is typically turned off. Exemplary warning conditions in decision box 509, which cause module 205,405 to end normal mode (step 57) and to stop transferring power to its output include: (i) input voltage less than predetermined value, e.g. about 10 volts for 5 seconds, (ii) rapid change in output voltage, for instance greater than 20% in 100 milliseconds, (iii) reception of signal requesting to stop producing power, (iv) not receiving a signal to produce power (in the case where recurring “allow production” signals are required for the converter to function), or (v) output exceeds over voltage threshold caused for instance when multiple modules 205 in string 203 are converting power (step 57) and one of modules 205 of string 203 shuts down, then the other modules 205 of string 203 have a raise of output voltage.