Hello, dear.
For your first question, the standard networking solution of Huawei inverters needs to ask the inverter sales to get an accurate answer. I think it is feasible, but please refer to the answer of the photovoltaic team. You can contact this email: inverter@huawei.com or call the hotline 400-822-9999.
In response to the second question, Huawei inverters can only perform total load statistics by using Huawei smart meters. It is not possible to calculate the consumption of each load.
In response to the third problem, Huawei inverters can only limit the total power but not the phase power.