I can speak from experience that my System Livoltek Hyper 5000 A.I.O has the ability to push excessive produced power after feeding loads to the grid for now I've only installed 4 x 550 Watt panels connected in Serie and its producing at average 1.8 kw and I export about 300 w to the grid.
100% understandable the Livoltek systems that I use also has local support and has been around for about 3 years and the have 10 years warrenty the batteries does 6000 cycles at 90% DOD and can parallel batteries up to 25 kw per 5 kw inverter it has a through put of 10 kw there is no limit on...
There are nothing wrong with the Growatt or the Luxpower but if you are looking for optimum charge and discharge according to usage its better to go with the Deye and Sunsynk its basically just about the life span of your battery ( Cycles wise ) that is influenced but I do have a system that is...