How to integrate Growatt inverter over modbus serial

sandbank93 · January 17, 2024, 8:37pm

Hey together,

that’s my third day with Home Assistant.
I want to integrate my Growatt PV inverter over a RS485 to USB Cable into my Home Assistant.

So far so good.

I started with the modbus configuration in the configuration.yaml

modbus:

name: modbus_hub
type: serial
port: /dev/ttyUSB0
baudrate: 9600
bytesize: 8
method: rtu
parity: E
stopbits: 1

Question: Do i have a chance to simply check if the modbus connection is working?
Should there pop up an entity if the connection is established?
Or what else should i do to get a connection to the USB Port?

If the connection will work, which parameter do i need for the energy dashboard?

I hope someone could help me.

Thank you!

okanano · February 6, 2024, 11:01pm

Hi @sandbank93,

Were you able to integrate Growatt on modbus serial?

Jurgen2003 · June 3, 2024, 7:04am

@okanano
i have the same problem
this modbus code is in my confuguration ymal
and I have installed an integration with solax inverter modbus but the integration keeps failing it is a growatt mic 2500tl-x
does anyone have an idea what the problem is ?
greetings jurgen

matrover · July 6, 2024, 12:35pm

Hi,

Wanted to report my successful attempt to connect my Growatt MOD 7000TL3-X via modbus to Home Assistant.

Did it via a Modbus to TCP converter: Waveshare RS485 TO ETH
Config:

And the HA custom component:

Device config:

Device:

Frank_R · January 2, 2025, 6:46pm

Wow, another solution. However I got here as I was looking for an option to write values to growatt invertor/battery, for example set solar limit or change battery modes. In this screenshot I only see HA sensors. Is there a way to control the growatt invertor as well?

matrover · January 3, 2025, 10:42am

With this you can wirte values, but the integration only supports inverter state atm.

Frank_R · January 3, 2025, 12:02pm

ah, ok, so it is possible to set the xx% limit solar output value.

I assume this is “just” as modbus write, right? So other addresses should work pretty similar.

matrover · January 3, 2025, 9:00pm

No not the limit in %, but only on/off

TheoHendriks · January 14, 2025, 4:55pm

Hi, how did you connect the Waveshare RS485 with ETH to the Growatt Inverter. Did you use the Sys Com port? If so, which pins have you connected to the A and B outputs of Waveshare?

matrover · January 15, 2025, 8:45am

Hi @TheoHendriks,

Yes the sys com port pinout below: