Is it possible to write the registers with Solarman?

[amiko24]

How can I write the registers about Solarman.
If I change mb_functioncode to 10, Solarman status changes to desconnect.

• start: 0x0063
  end: 0x006F
  mb_functioncode: 0x10

I use deye_sg04lp3.yaml

[joergjanssen]

.....me too: would be soooo nice to write the "Active Power Regulations" Parameter to set the Power-Transfer !!!

[amiko24]

@joergjanssen Which inverters do you have? What percentage do you want to set?

[joergjanssen]

...I managed it on my own with this automatisation - It uses a input_number as a slider, that sets the Inverter-Output-Power with the service solarman.write_multiple_holding_registers by writing the percentage value into register 40 (decimal - 108 hex)

alias: Autom_setMI600
description: ""
trigger:
  - platform: state
    entity_id:
      - input_number.set_mi600
    to: null
condition: []
action:
  - service: solarman.write_multiple_holding_registers
    data:
      register: 40
      values: "{{ states('input_number.set_mi600')|int(0) }}"
mode: single

To expalin the idea for this: I have a battery/PowerStation betwenn SolarPanesl and Inverter, and don't want to give all 600W to Inverer if not needed, to save Battery Power

Next Step will be further automatisation of setting Inverter-Power on its own by reading-data of my House-Power-Consumption . . .

[Wizwalli]

This is awesome, thank you for sharing the code! Looking forward to experiment with this code in the course of the next weeks

Goal
Located in belgium and conscious that returning to grid will soon be charged, I want to see if I could control when to return to grid.

Generated a graph that shows what the difference between the current tariff and dynamic tariff would be

Next step
Implement something that’d return to grid when the tariff difference is positive, run this as a simulation for a few months to collect data and see if I can make this profitable

[Ovik10]

How did you manage to add the write register?

[Wizwalli]

@Ovik10 I didn't get the time to test it but I plan to use the service "write_multiple_holding_registers"
It's exposed to HA via the developer tools

Bumped into it whilst digging in the documentation here

[Norrodar]

@Wizwalli do you have any update? :)
The old AT-Command was: -xmbw 00280001020078
Meaning:
0028 is the start address (Active power regulation)
0001 is the number of registers (1)
02 is the length of the value (2 bytes)
0078 is the value (0x0078 -> 120)

Source: https://github.com/s10l/deye-logger-at-cmd?tab=readme-ov-file

Does it mean that we can use 0001 as register and 0078 as value?

[amiko24]

Hi,
Complete code: 011000280001020078 + CRC code
01 - Device number
10 - Command write register

[Norrodar]

Hi @amiko24
Thanks for your input, very helpful :)

I used the following python script to calculate the CRC code:

def modbus_crc(data):
    crc = 0xFFFF
    for pos in data:
        crc ^= pos
        for _ in range(8):
            if (crc & 0x0001) != 0:
                crc >>= 1
                crc ^= 0xA001
            else:
                crc >>= 1
    return crc

command = [0x01, 0x10, 0x00, 0x28, 0x00, 0x01, 0x02, 0x00, 0x78]
crc = modbus_crc(command)
print(f\"CRC: {crc:04X}\")

It returns 5AA0 for my command 011000280001020078

So it should be
0110002800010200785AA0

Now I'm just wondering how to use home assistants mask to enter the full command. See the screenshot above.

[amiko24]

I'm sorry, I don't know.
I would try to do it like joergjanssen
just send the value to the register.

[Norrodar]

I tried sending the command using python socket. I got an answer that I can't translate, the ACtive Power Regulation stays the same. Maybe someone else is going thru this and have some luck - please let us know.

import socket

# Modbus-TCP-Befehl in Bytes umwandeln
command = bytes.fromhex('0110002800010200785AA0')

# Ziel-IP und Port
ip = '10.0.1.20'
port = 8899

# Socket erstellen und verbinden
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
    s.connect((ip, port))
    s.sendall(command)
    response = s.recv(1024)

print(f"Antwort vom Gerät: {response.hex()}")

[Wizwalli]

if you're planning to use this with Home Assistant, why not use this as I previously mentioned based on this:

[Norrodar]

Because I don't know how to split up the command using register and value :(