I think the idea is to see if there is a sort of standing draw on the external power battery bank from the converter being on with little 12v load, how much in amps NOT WATTS :), and then what happens with increased load.
Could better compare results with the other converters tested so far if tested the same way. Also confirms those tests if your results are in same ball park.
(There is some evidence the standing draw part increases a bit with heavier 12v but is still "affordable" in the scenario IMO.)
