There is no trickery here and the Xantrex battery monitor is not lying. Running this same exact TV on 120 volts AC through a 2000 watt Freedom marine inverter uses 5.8 amps or 5.8 ampere hours for every hour of run time.


When compared to running this SAME EXACT TV on 12 volts DC the inverter / wall-wort combo is 32.8% less efficient or a far cry from what many would assume is a 10% inverter inefficiency.


Keep in mind the efficiency loss is not just inverter. It comes from the conversions from DC to AC in the inverter and then AC back to DC through the TV's "wall wart". This inverter also has a rather high quiescent draw when just sitting there doing absolutely nothing waiting for an AC load.. The quiescent draw of the inverter is often left out of conversion efficiency claims yet it also serves to impact the total efficiency...