Some background. I live fulltime in a 44 foot motorhome. Other than the engine, it is basically all electric. When not connected to shore power, my inverters carry the loads.
I have two MultiPlus II 2x120 connected in parallel connected to a Cerbo GX. I am using Relay #1 on the Cerbo for generator control using Guimods. Most of the time, the system works well. Today, the outside temperature was above 105F and I had a complete system shutdown. My shore power connection, 50-amp, shutdown without warning pushing the entire load onto the inverters. They carried the load for a while and then shutdown on L1 Overtemperature or Overload, I believe. Since they are such work horses, I did not realize that shore power had dropped until all AC power disappeared.
I am looking at creating an automatic load shedding capability. I can independently disconnect certain loads to reduce the overall load on the system based on a signal input.
I know that I can use Node Red to look at various conditions and trigger the Cerbo #2 relay. But I would like to get better control of the possible problems.
Each MultiPlus has a K1 open collector relay control, and an Aux relay. What I would like to do is control each of these relays separately. For example, maybe use Inv #1, K1 to control a small relay and use that relay's contact to turn on a fan in the inverter bay. Maybe use the Inv #1 Aux relay to signal loss of Grid power inside the coach. On Inv #2, I could program its two relays for additional functions such as shedding loads one at a time until the warnings are reduced or eliminated..
It appears that I could use the VE.Bus System Configurator and Assistants to program the inverter K1 and Aux relay but that seems to be less convenient than a Node Red solution.
So, to make the question straight forward, can Node Red control the MultiPlus K1 and Aux relays on each inverter independently, or are they only controlled through the VE.Bus System Configurator and Assistants?
Any other thoughts or suggestions are welcome.
