I know that, yes, an inverter would take more or less an extra 30 watts when running, but unless you are running the engine, it doesn’t matter which way you power the monitor, the monitor’s watts/consumption will be the same. Car/Van batteries are not designed to be drained in this fashion, with the engine off. They will be ruined if they are deep cycled. Now, if you have deep cycle batteries or are running the engine, then an inverter is the way to go because battery life will not suffer.
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