Mine is on a 20A now. Its only drawing 0.28A right now with 2 sonic de-mousers and the converter with charged batteries.
Just don't run he AC!
. I had mine plugged in to 20A with a cord on a wind up reel I use for the yard. I figured just once I could get by running one of the AC's. Shortly after my son started yelling the cord was on fire. It melted and caught fire on the reel where it was partially wound. I threw it in the yard and it probably took 3 hrs to finish burning.