I dunno if this has been asked but if you are trying to determine the run time of, let's say, a 9V DVD batt and VRbox to an array of equipment, would it be accurate to determine this if you are running it in the quiet? I do not have a stereo system and the walls are too thin here to let the TV fly for the day. If I run it in the quiet, will the run time be the same as if the signal were kicking at a real show?