Originally Posted by petefoss
Any idea of the efficiency of straight 12V power vs. inverter generated 110V?
Hard to quantify without knowing specific components... but...
Every conversion has loss/inefficiencies.
Running on direct 12vDC has to be more efficient than 12vDC to inverter converting to 110vAC to brick/transformer converting back to 12v DC...
The waters muddy if you start needing voltage stepping circuits to get to 19v... but still would think a more efficient circuit would be possible than the conversion to AC and back.
Of course if the TV/device doesn't have an external brick/transformer - little choice other than an inverter - unless you want to open/mod the device.