Does anyone know if there is an option to combine a victron multiplus II and some SMA inverters in one system? I.e., if there is a controller that can measure the energy flow at the grid connection point behind the electricity meter and thus control the battery inverter either to charge or to feed? At the moment I have a sunny home manager 2.0 , 3 solar inverters and one AC battery inverter from SMA, but I want to extend this with a Victron Multiplus II 48/5000/70 plus a 16 S LFP battery pack. The sunny home manager clearly canot manage the victron - but can another controller?
Sma does not have zero feed in support on the victron side.
It will basically produce at full power and feed whatever.
What kind of control do you want to have over the Victron and with what system? There are many options like modbus, home assistant, node red.
Its supposed to be Node RED, as this is part of Venus OS. As I have discussed it with others, the way to control the victron inverter could be derived from the SMA system. The data from the grid connection point are available in the MODBUS registers of the SMA inverters, such as line voltage and current per phase, so the power situation also is known. If I can use these variables as inputs in Node RED, divide let’s say by 2 and send them to the inverter, as if it came from a smart meter, then it possibly should be able to charge / discharge its battery also by half of the full requirement. As it “steals” now energy from mains the SMA battery inverter also gets only 50% for charging. Its than the same vice versa.
I only just need to learn how I can read modbus TCP from the SMA device, calculate new values and send them to the victron inverter using Node RED.