A) pumps the power into his panel (his words) from the batteries and must disconnect the panel from the grid so as not to back feed it.
B) disconnects the EV charging system from the panel and connects the batteries to the EV charging system.
C) connects the batteries to the main panel and charges his EV which is connected to it and hopes he does not back feed the grid.
What do you think he is thinking about doing?
If it is either A or B then I am wrong and have misspoken. But if it is C, then.....