Controller 306 maintains safety mode operation (step 53) until a communications signal, e.g. 100 Hz, is received (decision box 505) 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 normal operation mode (step 57), typically with maximum power point tracking. 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. If in decision box 509, 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.