Xantrex DC Power Draw

[GAP]

While not on the road, i've recently started keeping my Elite 2 plugged in to power a dehumidifier.  As I did not want to have the charger constantly topping off the lithium batteries Per manufacturer's suggestion), I went to #26 in the Xantrex menu and set to Auto which disables the charger but still allows incoming for AC power for 110v devices such as the dehumidifier.  After about a week, I noticed that my two 200ah lithiums had drained down about 25% which is way way more then the normal parasitic draw would account for - LP/carbon monoxide detector, lights on the stereo display, etc...  In checking the Xantrex display, I can clearly see that the dehumidifier is drawing power from the shore source and not from the batteries. 

My gut tells me that the increased draw is from the Xantrex itself. The unit turns on automatically when the trailer is plugged into an AC source so I'm guessing that the power supplying the unit itself is drawing directly from the 12v system.

Does anyone know if I'm on the right track?

GAP