Mitch everything the others have said and…The Ac200 consumes a certain amount of power to generate regulaged DC and AC voltage even if there is no power being drawn. Basically the AC200 will run down if you leave it on and are not connceted to anything. The eco mode simply turns the unit off if you forgot to turn it off so the battery will not run down unintentionally
When you say “turn off” after 4 hours, do you mean AC and/or DC only or main power? I’m curious because my green power light never shuts off, 4 hours or even a day later. I haven’t located a good explanation of Eco mode.
Eco mode will only shut off AC after 4 hours. DC in unaffected by Eco mode. Eco mode does not shut down your unit (that is to say turn the whole thing off) at any time.
Totally separate from Eco mode and not affected by Eco mode, the unit will automatically shut down if no input and both AC and DC are off, after 24 hours. This appears to be a firmware safety feature and can not be disabled by the user. This is not mentioned in the manual.