Context:
Dear friends, I just recently got solar system installed at home which consists of an 8KW CoreTech Nexgen Single Phase inverter along with a CoreTech Luxwatt 5KW 51.2V lithium battery and connected to 8 Jinko N-type bi-facial Solar Panels 585W each. The system that I got installed from the vendor is hybrid and the electrical architecture that he implemented at our home is basically divided into heavy load and normal load. The electrician's intended purpose is to configure the inverter such that, whenever the battery drains < 50% then the heavy load should automatically switch to grid (K-Electric for my case), while the normal load uses the battery and then once the battery drains < 20% then the normal load should also switch to grid as well.
Problem:
The issue is that the inverter is switching both the heavy and normal load to the grid simultaneously at a certain battery percentage, rather than doing it separately for each load based on its specific battery percentage defined. Now the electrician who installed this system confidently claims that he has implemented this architecture and system with other inverters such as Inverex and it should happen but there seems to be a glitch or maybe the feature is missing in the CoreTech Nexgen series. He contacted the CoreTech service technical persons to discuss this issue, but those technical persons are denying that any such feature exists in the inverter and their verdict is that all load (heavy + normal) will switch to the grid at the same time.
So I need guidance on this matter and anyone who is an expert and especially those using CoreTech inverters who are using such configuration can please let me know if such thing exists or guide me the setting, so that I can communicate this with my installer. Would appreciate the support.