question

I am saying this a great del just recently... I am NOT a Victron expert

However if you tell an inverter charger not to charge and it still has an AC input its only option would be to ignore, and not use the powre, or pass it directly to the load thus not using the battery.

I suspect pass through is just that, input to output with the battery idle.

You will probably find that it will do what you want if you set it up to do that in the fist place. My point is that yor commands are probably correct but your basic setup isnt, or at least isnt what you think it is.

To be honest I dont understand what you are trying to do but the responce dosnt look silly from a device that will probably be attempting to maintain batter SOC untilll you tell it not to or it cant because there is no AC input.

my guess is that the response uld be 'inverting' if you physically disconnected the input or told it to ignore it.