Hello! I want to use the highly customisable generator start/stop relay on my Cerbo GX to control the AC ignore on my Multiplus 12/2000/80-32 230V. Most of the guides I’ve seen for setting this up are for the 3000VA Multiplus which has the 2 Aux inputs which aren’t present on the 2000VA model I have. Looking at the assistant setup in VEConfig it seems like I can select the Temperature sense input to do this instead though. Just want to check that I can actually just pass this 12v via the Cerbo relay and that I’m not going to fry the Multiplus by doing so!
After much more searching I found this:
in which someone says:
“AFAIR all 3 inputs - Aux 1, Aux 2, temp - are basically digital with 0 = <1V, 1 = >4V (there is an internal pullup resistor) and this is what the Assistants use.”
So I think what I am trying to do should work?
Since you have a Cerbo GX you might consider loading VenusOS Large and then turning on NodeRed. From there you can modify Ignore AC using some NodeRed flows and then using VenusOS 3.7x you can present those flows as virtual switches directly on the Victron GUI or in VRM. I use these on my RV to easily give me the ability to determine when to accept or deny shore power. You can ignore the AC Input Current Limit and Power Assist virtual switches in the image below.
Thanks! I’ve been meaning to look into Node Red but hadn’t gotten round to it, starting to take a look now. Are you switching the AC Ignore with those conditions or just setting the inverter switch position to Inverter Only? I’m wondering if it’s just easier to turn off the virtual switch on the Multiplus completely and just change the switch position instead?
When we originally created the flows there was no way to specifically work with IgnoreAC functions so we use inverter states inverter only and on. More recent Victron pallets I think they are called might have newer functions. Unfortunately I don’t get much time to work under the hood these days, but one my guys is pretty good at it. These days you could probably ask Claude and get 80% there with some tweaking on your own.
Have had a fun day of learning (been a while since I wrote any javascript haha) but I think I have it all working through Node-RED now. The AC Load functions are definitely working at least, just need to drain my batteries enough to test the SOC functions!
I couldn’t see how to enable the AC Ignore in the Multiplus without setting some rules there, and now I’m using Node-RED I obviously want to define all the rules there! So I’m just switching the Multiplus switch between Inverter Only and On, which seems to work fine.
For anyone searching for my original problem, someone on my similar post on the Victron Energy Facebook group said you can use the temperature sense inputs on the Multiplus but you wire them directly to the COM and NO on the Cerbo relay, and don’t introduce any power. I haven’t tested this to validate their claim though!
