Are you asking for something like this?

Some additional background based on this forum that I'd like @eg4eric to chime in on.  Have the issues with Smart Load been addressed and is it reliable?

What "Grid Always On" is supposed to do

Correct — it's meant to bypass the SOC/PV gating entirely whenever grid power is present, so the port only goes dark during an actual outage (and even then, only per whatever SOC floor you've set). 

But real-world behavior has been inconsistent

Digging into the EG4 community forum and the DIY Solar Power Forum, this setting has tripped people up more than once. One user reported that the "Grid Always On" setting didn't seem to affect the results at all in their testing. Another, working with a Signature Solar rep directly on configuration, found that when they tested by turning off the grid breaker, their smart port turned off until the grid breaker was turned back on — despite having Grid Always On enabled and settings meant to keep the port active off-grid at a sufficient SOC, and it took back-and-forth with support to sort out. A third user on a similar system reported the opposite headache: despite enabling Grid Always On and setting a narrow time window with high voltage thresholds as extra insurance, their EV still drew from the battery overnight while on-grid in self-consumption mode. Start PV Power Setting is Being Ignored – Inverters – EG4 Community Forum +2

The pattern across these threads is that the interaction between Grid Always On, the SOC/PV thresholds, and self-consumption/AC-charge modes isn't fully predictable, and sometimes needs vendor support intervention to get behaving as documented — which suggests firmware-version-dependent quirks rather than a clean, reliable override.

@eg4eric Eric, please address the "The "Grid Always On" setting doesn't seem to affect the results."  According to the notes, this setting is supposed to "Enable for continuous power supply on the GEN port when the grid is on.", so if we have grid, the port will be energized regardless of PV state.  Is this not the case?

cc @jared @jarrett @signaturesolarsupport

Just a word of note. I have an 18KPV and was using the Gen port for Smart Load also. It was working properly until I installed a GridBoss later, at which point the generator port (programed as a smart port) opened it''s AC connection to the inverter. Note that this is what currently happens when the inverter is connected to a GridBoss. I requested if a new software update could be produced to make this path work again but it never happened. See post -

18KPV AC Couple mode stopped working after adding GridBoss