Yes, confirm there is power in when there is no power out. One way is to unplug the converter and plug it into an extension cord running directly from the pedestal. Check for DC output at the converter's terminals.
The Parallax was hard wired for its 120v input and there is a breaker for that, often shared with another circuit. But the PD has a plug so you must have found a receptacle for it.
Whatever you did to get 120v to the converter might be the problem now. The PD 80 amper is supposed to have a 20 amp plug, not a 15, so you would need a 20 or a 15/20 receptacle, which is supposed to have 12 wire instead of 14 and it should go to a 20a breaker, which you might not have fitted in the panel when you installed the PD.
If it works on the alternative input path, then look at the 120v input starting with the breaker for the receptacle the converter was plugged into. Also if that receptacle is on a GFCI circuit that has popped.
The Ultra is a WFCO too, so run away! The other brands are all good for when sitting on shore power.
