I'm planning and understanding what I need from a high level design before I start talking to qualified installers in my area.
I'm in Cape Town/South Africa and we have load shedding daily and outages between 2-8 hours a day. So I'm looking at a MultiPlus II 5000 GX, MPPT RS 450/200, 1 or more 51.2V 100Ah LiFeP04 batteries with onboard BMS (Victron compatible) and ±15 x 545W PV Panels totaling ±8kW max output.
Working from home I want to design/split my load circuits into 3 categories, Critical Loads (Office, IT equipment, Fibre, WiFi and networking with average 1.4A max 2.5A), Essential Loads (Lights, house power points, small appliances, fridges and freezers) and Non-Essential Loads (Pool pump, geysers, heat pumps, aircons).
My idea is that I have my Critical loads on ACOut1, Essential Loads on ACOut2 and Non-Essential on the same circuit as ACIn.
- Can the ACOut2 relay be controlled to switch off if no grid, no solar and battery SOC is say less than 30%? That way I can keep at least my Critical loads running off battery a little longer.
- Is there a benefit of having a MultiPlus II + Cerbo vs Multiplus II GX?
- In this configuration, can excess solar be used to supply the Non-Essential loads to save on grid or alternatively feed-in to grid (with the correct meters and approval)?
- The MPPT RS spec on its DC Output charging power is confusing. 4kW per tracker but its max total is 11.5kW. Can someone explain this? I assumed the 450/100 will be to small for my application?
- On the City of Cape Town approved inverters dated 2023-01-06 (link below), the MultiPlus II 5000 is listed but not the GX model. Compared to the MultiPlus II 3000 GX where both models are listed. Is the 5000 GX in the process of being approved or can you consider the 5000 and 5000 GX to be the same inverter model with just the addition of the GX functions?
Thanks in advance