The factory site shows "seconds" for the CFX 50. We have a CF 50 which has been great. How much difference is there with the CFX? They seem to claim a bit less current draw, and i one model at least, a split between refer and freezer. We used the CF 50 at Powell,used the insullated jacket and kept it in the shade. A Group 31 did well over a 24 hour time. This would put the current draw at about an average of just about 1.5 amp hour by my guess, but did not do a timed study.