Even tho its probably a joke for any Wfco to put out its rated output into anything, it is not unusual for a PD converter to put out its rated DC output into a dead.......even 50% discharged battery.
Exactly the opposite of my semi-intensive testing, which says the PD converter will achieve it's max output in amps only with a good 120 volt or higher sine wave, while the wfco will achieve its max output with just about any junky power you throw at it. Specifically, the PD meets spec with good wall power or an inverter generator. With less than 120 volts or driven by an Onan Microquiet generator, it won't meet max output. The wfco 45 and 55 amp models deliver full output with any of those power sources down to somewhere below 110 volts. Until they break of course.