gdcarter

Thanks for the screens - the system is working as intended. The installer set it up such that AC (grid) [AC First setting] will be used first between 00:00 and 23:59 (screenshot 1). So between those times the inverter and house will ALWAYS use grid first - regardless of what is happening with solar. If there is no grid  - which you observed - then the solar kicks in. Additionally the settings [AC Charge] show that the battery is to be charged from the grid at all times between 00:00 and 23:59 (screenshot 2)
If you want the solar to be primary use during the day then
Set your AC first time to be outside of daytime hours, e.g. 17:00-05:00 - this means between 5pm and 5am it will use grid first - you can change those settings on the app in the AC first row. You have 3 AC first rows (1-3) so you can chop and change as you see fit. Set your AC charge times accordingly - remember - during the AC charge time it will recharge your batteries from the grid. So only do this if you absolutely want to charge batteries from the grid If you look at my screenshots you'll see that i have not set a timeframe for AC first - so the inverter will never use grid to power loads
I do have an AC charge setting for 23:15 - 23:45 - as this system only has 1 battery I top it up just in case
Find AC first and AC charge settings that work for you as those determine when the grid is used. Outside of those times the system will use DC (solar and Battery). Additionally (to further complicate things) if you click [Take Load together] the system will blend AC, PV and Battery to meet the load requirements. start with the 2 above then once you have that set you can try this 3rd complication 
goodluck 🙂

The Luxpower has 2 MPPTs and can take up to 6kw of solar. I think the Growatt only has 1 MPPT. Not sure about the Axpert tbh

They say max PV power is 6400watts but that is over both strings so it is actually 3200watts per string. Therefore 470x6=2820watts so 6 panels is ideal on one string.