That is my back up.  Using off the shelf converters like this doesn’t involve any bespoke remote elements. However this seems to be working great now. Now only the link to two inverters at once to test / fettle. DIn mounted modules and cheap Din boxes from local stores makes it a neat and cheap solution. My install looks neat and professional (mainly due to me not doing it 😀) this module in its din box looked the part..

Edited February 6, 20242 yr by Perfo
Added a thought

9 hours ago, Perfo said:

If my splitter works I’ll give it try. See how fast I can poll.  As it is a serial protocol I just thought it would wait for a send return (or time out) before sending another request.   I’m only looking for a hand full of data points on two inverters so if it works it is bound to be quick enough for me.. I’ll be caring it to what I’ve got at the moment which is between 1 and 3 minutes or walk there and look myself 😀.  So not much competition really….  Not sure how many bits per package get sent but at 9600 baud that’s a good few packets per second.. Did you notice a slow down or errors as you increased data points ? Of course having one per inverter would be better (providing the bottle neck doesn’t then move to the master) but I’m hmmmm deep pockets , short arms….

The modbus queue in node-red filled up too quickly and by the time the next run is triggered, the previous run is still busy. So the queue just grows and grows and you start getting errors. It's entirely possible to do this if you only have a few registers you want to read, but if you have as many as I have (25+ per inverter), it will exceed the limits of rs485. However, if you still exceed the limits, you can simply increase the delay between each run, which is what I had to do back then.

Ivette to get a few it’s and pieces to install this properly now I’ve proven it works ok. I’ll probably have 5 data points each so 10 in total if they update every 5 seconds that will be ok for my needs

@Yuri  did you manage to test the one power meter feeding two inverters ?  Thanks

I looked at it this weekend and it is not working 

Modbuspoll gave me a error checksum

That's a shame. especially as the WaveShare ModBus gadget I had to two inverters worked  luverly and this could read and write. Can you set the checksum in these inverters ? maybe one is set to odd and the other even or something.  Thanks for trying anyway.