I feel that I must fill in some background. I have an all electric Newmar Ventana coach. I have converted its 12 volt house system to a 24 volt system and I am running two Multiplus II 2x120 inverts in parallel. This gives us 4800 watts when off of shore power and up to a 4800 watt boost when on shore power. The system has been in operation since December 2022 and for the most part has worked well, but there have been a couple of problems that I believe that I have a solution for.
Our system has shutdown unexpectedly a couple of times for very legitimate reasons. In one case, we lost our 50 amp shore power connection when the pedestal breaker tripped. Another time, the electrical power company dumped power due to a transformer malfunction. We also lost power because of a high temperature alarm. Now each of these issued caused a legitimate shut down after producing a warning and an alarm.
I am looking at using Node Red to control relay 2 on the Cerbo GX. Relay 1 is configured for Automatic Generator Control. What I intend to do is use relay 2 to activate a Power Shedding Relay that I will install. In simplest terms, I will run certain higher wattage loads such as electrical water heat, one of the AC units, etc. through a power relay controlled by the power shed relay. When the power shed relay is triggered, the load shed relay will open reducing the loads on the inverters. My theory is that if the loads are reduced quickly enough, then the inverters will not have to go into emergency shutdown.
Now to my questions. Using "Temperature Alarm L1" as an example, the three states are 0-OK, 1-Warning, and 2-Alarm. I need to know:
1) whether the Multiplus shuts down on the Alarm immediately or whether there is a short delay,
2) how close to the maximum is the warning level set,
3) is there a way to show the current state of relay 2 as a node red display ( I can see the output change by going to the GUI and looking, but I am lazy, and, finally,
4) how can I inject a test to my setup to simulate a warning or an alarm condition. I know that I can inject a test signal, but I would like to know if the actual warning or alarm levels can be adjusted temporarily to simulate the operation while actually operating.
Any thoughts or suggestions are most welcome.
