I have programmed assistants to ignore the AC input under certain conditions, and it worked perfectly. I tried to do the same thing through Node-RED, to try to automate the change of conditions in which the AC input should be ignored. However, it did not work. I write “1” in “AC input ignored” of the Multiplus II in the VE.Bus System Control node, but it seems that some other process keeps writing “0” in the same control, and when I place a Debug node in the respective input node of “AC input ignored”, it changes to “0” right after I have written “1”, and the result is that the AC input is never ignored. Is it, or should it be possible to ignore the AC input through Node-RED?
Set the “switch position” object in the VE BUS system node to invert only..
2 Likes
It’s a good idea, it solves the main part of the problem. I have two problems to solve: 1. Being able to connect the AC input to a circuit limited to a current lower than the minimum current configurable for PowerAssist. 2. Being able to use equipment that only works at the frequency configured in the inverter, and does not work well at the grid frequency. For the first problem, it works to put it in inverter-only mode (when the AC load is greater than the AC input current limit). But for the second problem this does not work, because in inverter-only mode the inverter output continues to be synchronized with the AC input frequency. So I should be able to solve the first problem using Node RED, but I will have to continue solving the second problem using Multiplus’ assistants, which requires me to use an AUX input on Multiplus and have an electrical connection between Cerbo and Multiplus, which I would not need if I could solve it using Node RED. And in any case it seems to me that it is a bug that needs to be corrected, this option of ignoring the AC input not working with Node RED…
I managed to solve it by working with the mode, setting it to inverter mode only instead of working with the option to ignore the AC input. But doing it this way added a layer of logical complexity that would not exist if it were possible to do it just by setting it to ignore the AC input. By doing it by mode, you need to check what mode the inverter is in, and implement a control to return to on mode, if necessary. You need to consider the manual changes that can be made in the operating mode, so as not to lose this manual control. Even so, part of the manual control is lost, because when you set it to inverter mode only in automatic control, it becomes impossible to manually set it to inverter mode only, because the device will already be in inverter mode only, but it will return to on mode when the load falls below the limit. Another issue with this control based on the AC load is that the data on the AC current at the output fluctuates a lot, making it impossible to control using this data. The load power data in Watts is much more stable, making this automatic control of the use of the AC input much more viable.