I have a system installed with:
- One grid inverter [SMA Tripower (STP) 20kW + SMA Home manager 2.0];
- Three multiplus II (3kW, each);
- And a 3.7 kWh battery made of eletric vehicle modules with a BMS with two signal;
- One carlo gavazzi meter ( EM24DINAV53DISX );
- I'm using ESS with two signal BMS control;
The 20kW SMA is setup for zero injection on the grid (self-consumption), but sometimes it does feed power back to the grid since the three fase loads vary in time.
I have 4 questions:
(1) - The multiplus II is not delivering power back to the loads when they need that power (i.e. when there is not enough sun and the battery has 100% SOC), how can I comand the inverters to pull the energy from the batteries and delivered back to the loads? I'm trying to avoid at all costs to inject power back to the grid.
(2) - I have a Venus GX + warning LEDs installed in the DC bus bar of the battery, this loads are pulling energy from the battery and voltage keeps following. The Remote console and the other graphs shows the SOC at 100%, but I know that it's not real, since for my battery 64V is 100% SOC and 52V is 0%, how can I control the SOC and display the correct SOC values?
(3) - I want to charge the battery with all the inverters installed in all three phases, but when I was configuring the assistant, he only offered me the possibility to have one comand to the battery BMS, how can I do this? I have already three relays for each inverter, but right now I'm using only one input.
(4) - I want to store the excess of eletricity in the phases that are unballanced, how can I do this? I can see in the tab (advanced) at VRM what are the phases, that are unballanced but I'm not able to pull that energy into the DC bus bar back to the battery or back into one of the other phases. I know that this is not the most efficient system, and that, I'll lose energy in this process, but I need that configuration.
I've already read many articles in the Victron Live web page, but didn't found the things that I was looking for, here are some examples:
Thanks for your attention and feel free to ask me another questions.
Have a nice week,