Hello, I have the idea of installing the EcoFlow in a van as a camping battery and power supply. That means charging 12V via the car while driving and 230V via the "external" socket while camping, without having to change the plug or switch over. For the operation of a refrigerator & the interior lighting, so that this always works. Does this unit check itself, or can you "prioritise" the supply? Or do you always have to plug over & switch the input on the unit? Thanks for the answer