How to use postCommunicationModbus? about openinvertergateway HOT 13 CLOSED

Reading through the code I see that the RW Modbus option only reads the holding registers and not the input registers. Still figuring out how to read PV1 and PV2 Power.

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Depending on your RTU Protocol (which i believe is tied to your growatt inverter model and/or serial/usb stick), you can find it in the specification:
(start at page 25) v1.0.5 (newest version i believe): https://www.photovoltaicsolar.in/Growatt_Manual/MAX%20Series%20Modbus%20RTU%20Protocol.pdf
(start at page 10) v3.0.5 (older version i believe): https://docplayer.net/161194234-Growatt-pv-inverter-modbus-rs485-rtu-protocol.html

I believe the input registers do get read if i look at Growatt.cpp line 22 and 32.
Line 22 (input register 28) matches on the v3.0.5 specification for total energy.
Line 32 (input register 55) matches on the v1.05 specification for total energy.

I did found other projects on github (e.g. https://github.com/nygma2004/growatt2mqtt/blob/main/Growatt2mqtt_1p2s.ino start on line 135) which matches the input registers on the v3.0.5 specification.

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(Input reg 5 for PV1 power and input reg 9 for PV2 power for both the v1.0.5 spec and the v3.0.5 spec)

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Lots of Thanks!!

The doc I found has the same specification. I also tried out the regs you proposed this afternoon. IIRC, Reg 5 gave me the right value for PV1. Reg 9 however was 0.

I Also tried out 6 and 10, which also gave unexpected results. Maybe I programmed it wrong? I'm not a programmer.

Growatt.cpp (ln 70)

...
    if (res == Modbus.ku8MBSuccess)
    {
      _Data.InverterStatus     = (eGrowattStatus_t)Modbus.getResponseBuffer(0);
      _Data.u32DcPower         = (Modbus.getResponseBuffer(5) << 16) + Modbus.getResponseBuffer(9);
      _Data.u16DcPowerPV1      =  Modbus.getResponseBuffer(5);
      _Data.u16DcPowerPV2      =  Modbus.getResponseBuffer(9);
      _Data.u16DcVoltage       =  Modbus.getResponseBuffer(3);
      _Data.u16DcInputCurrent  =  Modbus.getResponseBuffer(4);
   
      //return true;
    }
...

Growatt.h (ln 24)

...
    float            GetDcPower();
    float            GetDcPowerPV1();
    float            GetDcPowerPV2();
    float            GetDcVoltage();
...

Index.h (ln 88)

...
    document.getElementById("DcVoltage").innerHTML = "DC Voltage: " + obj.DcVoltage + " V"; 
    document.getElementById("DcPower").innerHTML = "DC Power Total: " + obj.DcPower + " W"; 
    document.getElementById("DcPowerPV1").innerHTML = "DC Power String 1: " + obj.DcPowerPV1 + " W"; 
    document.getElementById("DcPowerPV2").innerHTML = "DC Power String 2: " + obj.DcPowerPV2 + " W"; 
...

ShineWiFi-S_ModBus.ino (ln 521)

...
  sprintf(Buffer, "%s  \"DcVoltage\": %.1f,\r\n",       Buffer, Inverter.GetDcVoltage());
  sprintf(Buffer, "%s  \"DcPower\": %.1f,\r\n",         Buffer, Inverter.GetDcPower());
  sprintf(Buffer, "%s  \"DcPowerPV1\": %.1f,\r\n",      Buffer, Inverter.GetDcPowerPV1());
  sprintf(Buffer, "%s  \"DcPowerPV2\": %.1f,\r\n",      Buffer, Inverter.GetDcPowerPV2());

What am I missing?
Is it the "shift left +" thingy? Has something to do with u16 to u32 conversion but I don't understand it fully.

BTW: I have Growatt 6000TL-XE and ShineWiFi_X

from openinvertergateway.

Not a programmer as well. Do you have an ShineWifi-X or ShineWifi-S?

I think for the ShineWifi-X you need the following:
res = Modbus.readInputRegisters(0, 9); line 70 Growatt.cpp

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Thanks. Seems obvious to read from 0 to 9

This is what I've tested so far. The second image shows the correct value for PV1.

It's getting dark now. So maybe tomorrow I'll tweak a little more.

BTW I've found working solution here using ESPHome. I've modified this code a bit using reg 6 and 10. These gave me the correct power output. of PV1 and PV2. So we're definitely missing something with the above code...

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I am waiting on my wemos d1 so i can try it my self on the SYSCOM port. Currently the ShineWifi-X is working as I intended with domoticz so I wont mess around with it.

I did even found an 1.20 version PDF which has an date of 2020 and mentions the TL-XE series (newest inverter series is believe, at least the one I have).
https://github.com/nygma2004/growatt2mqtt/blob/main/Growatt%20PV%20Inverter%20Modbus%20RS485%20RTU%20Protocol%20v120.pdf

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Thanks!
The v1.20 also states that the PV1 and PV2 power should be read from registers 5/6 for PV1 and 9/10 for the PV2 string. Therefore, I would assume that the code below should work to get the correct values of both strings.

res = Modbus.readInputRegisters(0, 10); // line 70 Growatt.cpp

and adding around line 74

      _Data.u32DcPowerPV1         = (Modbus.getResponseBuffer(5) << 16) + Modbus.getResponseBuffer(6);
      _Data.u32DcPowerPV2         = (Modbus.getResponseBuffer(9) << 16) + Modbus.getResponseBuffer(10);

I haven't tested this since the ESPHome code I am currently using gives me the proper output.

BTW _Data.u32DcPower (line 74) only shows the power output for PV1. I would suggest to @otti to change this line to _Data.u32DcPowerPV1 so that people know that the total PV power is not shown here as I initially assumed ;-)

Yes please let us know this works via the SYSCOM port!

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Small update on my end, i got the SYSCOM port working, but it wouldnt read any of the PV1 and PV2. It did manage to retreive the other registers (with this repo code). I got it now running with own-customized code of https://github.com/nygma2004/growatt2mqtt.

Next up, compare code why it doesnt work with this repo but it does with the other one.

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Nice one!
So you're saying you can read PV2 DC-Power from SYSCOM with this repo code? Do you have the ability to check your repo with the ShineWifi-X or ShineWifi-S? Because I couldn't get it to work.

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I ended up using the other repo and haven't checked this repo any further for the issues we are facing. (still not a programmer ;) )

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No problem @superfunnl ;-)
Glad you got it working!

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After #61 you should now be able to get invert PV Power values (1-7).

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