Fronius Hybrid with Modbus TCP

[Tico]

Gast - Which value worked for you? AC_Power or DCW?

I will incorporate this scenario in the wiki when I confirm that detail.

[Tico]

That's correct. Configure a new and separate Modbus Server in Loxone for the Symo 20 and switch the inverter settings to Modbus TCP.

Also change the Modbus port to 503.

You will then have two Modbus servers in Loxone -

Symo-Hybrid with IP address xxx.xxx.xxx.xxx: 502
Symo 20 with IP address xxx.xxx.xxx.xxx: 503

You may find that the Symo 20 uses a different Modbus register for the total power. There are two options -

DCW - Total DC power from the system.
AC_Power - Total AC power from the system.

The 'AC_Power' sensor works for both Symo 20 and Hybrid inverters (Fronius uses 1_DCW for the solar Production display of the Hybrid).



Use whichever value more closely matches the Fronius solar Production display for the Symo 20. Most likely it will be AC_Power.

Yes, the Symo sends data to solarweb - I can see this data.


The Symo 20 is configured with Modbus RTU in the webinterface. I thought this is configured to communicate with the other components.

So, I will test to switch to Modbus TCP. Am I right that I have to configure another Modbus Server in Loxone? Sounds like

[Tico]

Yes, the Modbus registers are the same for the Symo 20 and Hybrid Symo. You should be able to use just the DCW value for the total energy from the Symo 20.

Just to clarify -

The Hybrid Symo talks to the Smartmeter and the Battery with Modbus RTU. Those three devices (Hybrid, Battery, Smartmeter) have an exclusive Modbus RTU connection. This 'system' then connects to the home network via wifi or ethernet.

The Symo 20 should be currently connected to the home network (via wifi or ethernet) and joined with the other components in the cloud (ie. Fronius Solar.web). It won't have local communication to the other system. Are you currently seeing it's data in Solar.web?

Hello, I'm new in this forum. First: Many thanks to all who work in wiki and forum!!

I configured the energy monitoring like it's described in the wiki. It works fine, so long...

I have another Symo 20 and I don't get the data yet. What modbus adress do I have to configure in my third device. Are the registers the same as in Hybrid?
The Hybrid talks to Smartmeter and Symo with modbus rtu for sure.

[Haidy]

Since there is no battery in my setup (only Symo 4.5.3 and SmartMeter), I think I can simplify the logic as you can seen in my screenshot, but I'm not sure. I have to check it again tomorrow, when energy is produced.

[Tico]

There is an update in the wiki. It mainly deals with the automation of battery control.

https://www.loxwiki.eu/display/LOXEN...ith+Modbus+TCP

[Tico]

👍

[mgerste]

Hello, I have now got it working according to your description. Thank you very much Martin

[Tico]

Moving Average block
Remanence input - checked
ST = 10
S = 30

[mgerste]

Hello, can you please explain the element with the heading 5 min average to me. Which element is it and how should it be set? I think I got the rest of it. Thank you

[Tico]

The work-around is part of my 'whole-of-house' loxone project. The screenshots should provide all the detail you need.

Otherwise, give a shout out and I'm sure I can clarify anything.

[mgerste]

Hello, thanks for the instructions. I'll try it out on the weekend. Maybe you can post the workaround as a project file. Unfortunately, I am not that skilled and would find the right building blocks faster. Thanks for the support.

[Tico]

Ignore the previous post. I already had a work-around for the 1_DCW problem buried in a different part of my config. I'd forgotten about it, sorry! The Emergency Power mode is not relevant.

The best description is in the attached pictures -

1. When the inverter is shutdown, it shows a status (Hybrid Modbus sensor StVnd) of value 3. That's when it outputs the 'null' output of 655.4 W.

2. A Status block intercepts when StVnd = 3 and modifies the 1_DCW output to 0 watts.

3. There's an extra work-around here to deal with spurious 1_DCW values that occasionally occur. If the 1_DCW value is greater than the solar array can produce, it instead replaces the value with a 5 minute moving average. If you are keeping statistics of solar production, this keeps the graph 'nice' and prevents spurious high values distorting the scale.

[Tico]

I don't have the Emergency Power mode activated. I'll have a look tonight and see what settings are available for a work-around.

The value 655.4 is effectively the 'sleep mode' of the inverter with a null output. You could try the settings in the attached picture to see if these keep the inverter alive.