Talk with Deye solar inverter ?

[jedie]

Has somebody used pymodbus to talk with Deye solar inverter?

To read registers from the inverter it's needed to add more stuff to the "read package request" like a "controle code" and the inverter serial number.

My first idea is to build a own "framer" based on ModbusRtuFramer and use the buildPacket method to build the complete package. Is this the correct way to go?

[janiversen]

you can either build your own framer, if all request share a common pattern.

Or add custom function codes, that adds what you need.

[janiversen]

However it sounds a bit like your inverter is not really using the modbus protocol.

A lot of inverters need a primary request with the information you talk about to verify the connection, this is done by adding a custom function code. Adding that information to each request is really non-standard and might break a number of other parts.

[jedie]

Maybe... There is something like that, a hardcoded "Password"... For Deye it's WIFIKIT-214028-READ
But i think this is only needed for AT-commands, send via port 48899 and not for modbus communication on port 8899. But i have to check this out.

[janiversen]

That is typically for the AT command, and not for the modbus communication

[jedie]

Yes. But for modbus write commands i found something like this:

https://github.com/kbialek/deye-inverter-mqtt/blob/67d2c88b58bb8f15719397d99a7325b4512ab1d6/deye_modbus.py#L81-L101

[janiversen]

Ok, feel free to use that if you want, I was simply trying to help.