Dear all. Please help me with a question. I have a 3kwp ongrid PV system (with ABB inverter) with excess feed in to grid, and i'll extend the system with a Multiplus II GX 48/3000 and a 48V 180Ah PZS battery pack . My main purpose is to optimize self consumption (with 50-60% of the batteries), and also make my PV system work even in case of a power failure (which is pretty often in our village). I can go pretty low with my essential consumption (fridge+freezer+lights+water pump+ charging tools/phone), because i can heat my house+produce hot water also with wood boiler/stove. In the summertime DHW is produced by solar thermal collector.
I want to separate my non essential loads (electric water heater, and a small heat pump (consuming between 3A-11A), and i don't want to supply them AT ALL from battery backup (i dont' want to discharge my batteries too fast, shortening their lifecycle....).
My question is: if i connect my non essential loads to AC2 output, and during daytime, at a certain moment for example PV array produces 800W, no consumption on AC1, and my water heater on AC2 consumes 2000W, will the MPII try to supply the difference of 1200W from the batteries? Or from the grid? (As I heard, the MP try to assure zero input/output on the measuring point, which in my case is inside the MP, no ET112 energy meter will be used. So i think it will try to use the batteries, instead of taking from the grid, but i am not sure....). This is "version B" from the attached drawing.
Or i better use "version A", and connect my non-essentials parallel to MPII ? Disadvantage would be that i can not monitorize my non essential consumers via Victron portal, but i prefer this, than shortening my batteries lifetime.
Your kind help will be higly appreciated.