How to integrate Growatt inverter over modbus serial

Configuration
1

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!

2

Hi @sandbank93,

Were you able to integrate Growatt on modbus serial?

3

@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

4

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:

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And the HA custom component:

Device config:
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Device:

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2 Likes
5

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?

1 Like
6

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

7

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.

8

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

9

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?

10

Hi @TheoHendriks,

Yes the sys com port pinout below:

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11

Interesting as waveshare does state that this device does not support modbus - i have ordered another type (USR-W610).
Futhermore the intergrations GitHub - WouterTuinstra/Homeassistant-Growatt-Local-Modbus: Provides Home Assistant sensors for Growatt inverters that you can connect directly using modbus protocol and Homeassistant-Growatt-Local-Modbus/README.md at master · brupje/Homeassistant-Growatt-Local-Modbus · GitHub do also not seem to work (failure in pymodbus library : [pymodbus.framer.rtu_framer’] )

12

Is it possible to use this modbus integration with a modbus proxy ?

I am using evcc as a PV surplus charger with my pulsar Plus wallbox from wallbox.
This is running on HA as addon and I have configured the modbus proxy this way.
I am using a simple ftdi USB adapter which is connected to the Growatt SPH 4600

The integration works if I use this with the USB setup but then I get error messages on the evcc add on like this

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This is my modbus Proxy setup

- port: 5022
  device: /dev/serial/by-path/platform-fd500000.pcie-pci-0000:01:00.0-usb-0:1.3:1.0-port0
  baudrate: 9600
  comset: "8N1"
- port: 5023
  uri: 192.178.168.2:502
  rtu: true

I got a connection error when setting up the connection to
192.178.168.2
502

Any ideas ?

13

Hast du das zufällig mittlerweile mit der Einbindung vom Growatt in evcc hinbekommen?

14

ja, das war ein defekter USB Stick