Hello people,
I see you have experience with Logger 1000 Sungrow. I am trying to adjust the power of the power plant by writing to the logger registers, but without success. I just found a document on the Internet with modbus logger registers under the name Logger communication protocol AW0 1.0.2.7. In that document it says that it is register 48003, but it seems that I cannot write to it. I did the testing with the Modbus Poll software. Do you have any solution for my problem?
Hello,
I’ve used the Sungrow Logger 1000 in the past. What you found is correct, however missing some critical details, which were either omitted on the file you found or you missed them while reading it.
In Sungrow Logger 1000, all Modbus addresses that are shown on the file need to be subtacted by 1 because of how they configured it, as you can see on the screenshot). Also, do note that the unit ID necessary to communicate with the logger, by default, is 247. Cheers! 
Dear Sir.
I have the same problem.
I could read modbus from logger 1000 ID 247 without problem.
I knew to substract address by 1 unit.
But I still couldn’t send control command to logger with id 247.
Addition, I don’t know the means of this address is control total active power for all of inverters or for each inverter.
Example: The logger’s connect ting to 10 inverters ( each inverter 100Kw). The Total active Power is 1000Kw. I need to set up total active power to level 600Kw, I have to send command 600 to logger for total active power or 60 lo loger ( after that Logger will automatically set each inverter 60KW)
Many Thank
As you can read parameters with Homey, it looks like the problem is not Homey related. Presuming you use the right THEN Write card and not a THEN read card
There are so many prerequisites mentioned in the manual, that you might find an answer faster on the support site of the manufacturer or some where else if any special MODBUS requirements exists for the Sungrow Logger for setting parameters.
Just show a printscreen of your testflow for setting a parameter. As I am not shure if you are aware that the -1 required for addressing can be set in the THEN Write card by selecting register or address values.
I also have no idea if you can read the same parameter from each of the 10 invertors, and your port forwarding settings are ok.
It is not documented in the manual that the logger will automatically reduce the power of every inverter after 1 MODBUS command. For automatically there should be a group client number for the 10 invertors beside 10 individual client numbers.
Use some general ModBus test tool like Mtcp on iPad for getting the right addresses and write functions.
