Hi Nick,
To answer your question on: This shows my battery charging to 100% and then discharging approximately +-45Watt constantly. It then shows 97% battery until load-shedding where it discharges further till 84%. After AC is restored it re-charges back to 100% and starts the discharging again.
Is this normal?
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Not sure if your issue has been resolved: I have the same setup as you. No solar. I resolved it by doing the following: On your settings (either app or PC) section under Application Setting. Change AC first Start Time 1 to: 00:00 and AC first End Time 1 to: 23:59. This basically forces the inverter to use grid power only and not some of the battery power as well. And when the grid goes off the battery kicks in. Plain and simple. You will still see that the battery discharging at around 20w when full but i think this is normal. I recon the inverter is just keeping the battery a bit active. Your battery will stay at 100% for a couple of hours and will drop to 99% due to the slow discharge. Hope this helps.