Glad you pointed this out. I did measure load in the camper that morning and on high it was drawing 1.75 amps / 125 watts.
Regarding when we use this, I leave it on all the time while in storage and plugged in to keep humidity low in the Oliver during storage.
For the situation this post was referring to, we were without power in the park due to storms, and the very low draw allowed us to remain in total comfort running only the dehumidifier throughout the night, and in the morning we still had 69% of our lithium batteries (640 a/h system) remaining on the Victron meter.
We are currently reroute home so I will answer additional questions this evening.