I hope I am answering my own question correctly. I found on the PD website
Note: As of January 1, 2016, the hot buss in our model PD4045 and PD4060 is no longer supplied by Progressive Dynamics as it is not required for the proper function of the power center. If you have any questions, please feel free to contact our Service Department at 269-781-4242.
I am hoping this is the buss I am questioning.
Still don't know where the hot lead from the converter side is supposed to go. To a hot 120 lug I guess.