question

Hi @asko58

Easiest option is what you suggested using MQTT data of victron system to read the data in home automation system. In terms of finding out what info is published on MQTT i tend to look at DBUS addresses here:

Just check this has the data you need if it does then you should be good:

dbus · victronenergy/venus Wiki · GitHub

I'm not sure what device the solaredge is setup as but my guess is PVInverter.

Otherwise i think you could probably get data via RS485. I'm not sure if it's officially supported by victron but if not a lot of folk in the community have written custom drivers (tend to be in python) to add support for meters they have. You may be able to tweak someone elses code or find the exact one if someone has done similar. I'll have a search and see if i can find anything on github, but i think the MQTT option is easiest.

EDIT:

I couldnt find a perfect example of github. But you could probably tweak the shelly power monitor code to get the data from this:

GitHub - nmakel/solaredge_modbus: SolarEdge Modbus data collection library

Rather than the http endpoint in the shelly power monitor code:

dbus-shelly-3em-smartmeter/dbus-shelly-3em-smartmeter.py at main · fabian-lauer/

(Row 132 in code).

Hi @matt1309

thank you for your answer! From what you are saying about the easiest way being MQTT to get the values for home automation I deduct that a ModbusTCP connection beween the Solaredge inverter and the Multi is possible without additional drivers, right?

Thank you for pointing out the alternatives. I rougly get what the code is doint where, but I have to admit that my understanding of the inner workings of Venus OS and my Python skills are rather limited. Even if I managed, the RS485 bus might not work with two masters (GX + inverter) being on the bus.

Am I correct that a connection to an EM24 or similar via RS485 works with built in drivers? It would be interesting to know what other meters are supported this way, maybe I could find a work-around.

Hi @asko58

I believe to enable inverter monitoring via Victron GX device you connect via modbus TCP.

The bit you might need custom drivers for is if you want to read the SE energy meter data directly via modbus RTU/RS485.

I would suggest you use this link to get solar edge data into victron system.

Integrating with SolarEdge [Victron Energy]

Then read the data from victron either via victron's modbusTCP server or MQTT to get the information into your homeautomation. I prefer MQTT but I know many others with home assistant use victrons modbusTCP to read the data.

I have an ET112 and i know that uses rs485 but not sure if its strictly modbus protocol or not. If it is then you're right could (probably easily) tweak the drivers in venus os to get it working. I wasn't 100% sure on that hence why i defaulted to using the python modbus github link in combination with the shelly energy meter to get the answer. But a good shout definitely worth looking into ET112/EM24 to see if they use modbus via RS485. Would just need to tweak the id's of the data from SE energy meter then

EDIT:

I think you're right. I've just checked. I believe the driver is stored in:

/opt/victronenergy/carlo_gavazzi.py

So may be worth trying to change the registers to whatever registers the SE one uses.

May be worth copying the file and then adding it to dbus-modbus-client.py to follow the same layout as the ABB and carlo meters have been added.

If you go this route you'll get way more help in modifications section.

Hi @matt1309

thank you for looking into this in detail! I'll try and give it a shot changing the original dbus-modbus-client interface. And I will also try and have a look if it is possible to even just integrate a modbus sniffer driver. That way the connection between the inverter and the meter would even remain untouched.

Like this one here

https://github.com/snhobbs/ModbusSniffer