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Hi
Is it possible to start/stop the generator on a Quattro using ModbusTCP? It looks like this is register 3223 from the spreadsheet (CCGX-Modbus-TCP-register-list-2.23.xlsx) , but I have no idea which id this corresponds to and they all fail. It is listed as com.victronenergy.genset in the dbus-service-name.
I am using ModbusTcpClient on a local Raspberry Pi to do this from Python.
Thanks
Mike
Waking up this thread albeit with Multiplus.
As part of my installation I have a Multiplus II 5000, CCGX and Kohler generator. The generator is connected/wired to the relay of the CCGX. I have the generator auto-start function activated and all works well. But I want to be able to start the generator manually for a given period of time using my Home Assistant house automation system. I can do it using the CCGX MQTT broker set-up on topics /ManualStartTimer and /ManualStart. Following the instructions I first set the ManualStartTime to whatever duration I want the generator to run, and then send a 1 on ManualStart. I have this working well too.
Now for a number of reasons I want to use the CCGX modbus TCP protocol instead of MQTT. Looking through the modbus register file I see at com.victronenergy.generator register 3500 Manual Start which is writable, but I cannot find the equivalent of /ManualStartTimer. Modbus registers 3502 and 3504, Runtime in seconds, are only readable, not writable.
Question: Which modbus register to set generator manual start timer?
Hi, this depends on how you’ve wired the generator; its not possible to control the relay inside the Quattro, using ModbusTCP
But, if you’re using the generator start/stop mechanism in your GX device, and have the generator wired there as well, then you can do it via ModbusTCP.
Hey there mvader,
I've got an RPi 3 B+ running Venus OS v2.30~45 (really awesome, btw, I'll probably end up buying a real Venus GX now that I've used it). I've got a MPPT 150/85 and BMV-712 on USB, all working great.
I'm using OpenHAB2 for some things, and I can toggle the relay via modbus TCP from OH if I write to register 806 (in com.victronenergy.system), but the relay has to be in manual mode on the Venus. If I switch the relay mode to Generator Start/Stop, I can only monitor the relay from OH, writing to 806 register doesn't stick, it just toggles back to 0.
So, probably like the OP Mike, I figured maybe I would need to use the com.victronenergy.genset registers instead after switching the relay to Generator Start/Stop. However, I've got the same problem, I can't find these addresses in Modbus, I don't know what UnitID to map.
Any help would be appreciated.
Hi @mvader (Victron Energy Staff)
If we use the relay in the GX to start/stop the generator, when the Quattro requests power, will that trigger the relay in the GX?
That depends on the settings, please see our generator start/stop manual. And, your question is not related to ModbusTCP, or is it? In that case, if you have more questions, please ask a new question; and then community can help you.
Success!
Raising the question again. Not really an issue just that I need to keep both MQTT and modbus integrations which I’d rather not for simplicity reasons.
