Incidently, I had my Lux Power/SVolt batteries installed about 2 months ago. Happy "as a pig in swill". Should have done this earlier. This is working smoothly without a hitch....touch wood.
My SNA5000 is set to discharge battery to 50%. Grid then powers the household until the sun comes up. The PV will then charge battery to 100% & supply house with power. If during the night when battery at 50%, loadshedding kicks in, the battery will discharge until grid is back, the grid will then recharge the battery to 50% until sun can supply power.