@CurlyParakeet @PetraPhoenix There's no difference between plugging in an inverter and having one wired in, except for the socket. The way they work is the same, it's just a device that monitors the input (to sync to it, and for safety) and then injects electricity into the system. Other devices don't care where the power is coming from, just that it's there. So inverter/battery/mains, it's just electricity to the devices using it. The safety part the same for both systems, but for more reasons for a plugin unit. As someone else said, the device monitors the grid feed to make sure when you unplug it (and so it can't "see" the grid) it turns off it's output so you don't get a shock or worse.