He's not tripping the breaker or shutting down the channel. a.k.a. he isn't actually exceeding the capabilities of the transformer. All that is actually happening is a red light is blinking rapidly.
Why is the detection circuit triggering at 18 volts and not 16 volts? Why would there be noise at 18 volts and not 16 volts? The test with the brick confirms he is well below the current limit and the test with removing the passenger cars re enforces this isn't an overload. I don't know what the detection circuit is looking at but it seems to be triggering a false positive.
