That's a good question.
I'm designing my system and though this Aux thing sounds great.
Put the Pool & Geyser on AUX. Then use excess power to run those during the day. IF we need to heat up the geyser at night, switch to 'On Grid Always On' to draw from grid, or even if it's been cloudy and we need to run the pool.
Now you raised the question. If LOAD (Essentials) are running and the conditions are met to run AUX (Non-essentials), and together they draw over 5Kw, will the inverter trip? Or even if 'On Grid Always On' is set, and AUX & LOAD draw over 5Kw will it trip?
If this is the case it might make sense to put a bypass switch in, run non-essentials from AUX or from the grid, and don't touch 'On Grid Always On'.
Anyone know?