Hi,
i want to share my project to connect a Solax X1/X3 Solar Inverter without Solax Cloud and without Pocket Wifi. Data will be read complete locally by Modbus RS-485 RTU and share it via MQTT.
So any Homeautomatisation solution has access to that Solar LiveData.
Please visit my github project: GitHub - tobiasfaust/SolaxModbusGateway: Solax Modbus to MQTT Gateway
Screenshot of Webfrontend:
You can use Tasmota if you want.
as far as i know the tasmota extension does not support Solax G4 series, only G3 Series.
I tested it some weeks before.
@tobiasfaust Thanks for sharing your project! I’ve been trying to connect my Solax X1 Boost (serial number starts with XB) inverter through RS485, but I’ve been unsuccessful so far.
Shouldn’t it be possible to utilize ESPHome’s (or ESPEasy, etc.) native modbus functionality, at least for reading basic data (powerdc1, etc.)? I must note that I don’t know much about the protocol, but the documentation provided in your repository appears pretty standard, e.g. function code 0X04 for reading input registers.
When I connect to the inverter using ESPHome and baud rate 9600 I receive the following error:
[D][modbus:115]: Modbus error function code: 0x84 exception: 2
[E][modbus_controller:068]: Modbus error function code: 0x4 exception: 2
[E][modbus_controller:072]: Modbus error - last command: function code=0x4 register address = 0xA registers count=2 payload size=0
It feels like I’m close to fetching data from the inverter, but there’s an addressing error (exception 2).
I finally got this to work without another custom firmware. It’s just ESPHome and getting the addressing right for my Solax X1 Boost (XB33…) was the biggest challenge. I’m using a Wemos D1 Mini with this Modbus Shield V2 to send the measurements to HA wirelessly. You don’t need the shield, since the wiring is pretty easy, but it cleans up the project nicely.
# Enable/Disable logging
logger:
# level: VERY_VERBOSE
baud_rate: 0 ## Must be 0 to prevent reading issues and buffer overflows
uart:
id: mod_bus
tx_pin: D7
rx_pin: D6
baud_rate: 9600
stop_bits: 1
modbus:
flow_control_pin: D5
id: modbus1
send_wait_time: 1000ms
modbus_controller:
- id: solax
address: 0x1
modbus_id: modbus1
setup_priority: -10
#command_throttle: 250ms
update_interval: 15s
sensor:
- platform: modbus_controller
modbus_controller_id: solax
name: "${prefix} PV1 Input Voltage"
address: 0x400
register_type: read
value_type: U_WORD
accuracy_decimals: 1
unit_of_measurement: V
device_class: voltage
state_class: measurement
filters:
- multiply: 0.1
- platform: modbus_controller
modbus_controller_id: solax
name: "${prefix} PV2 Input Voltage"
address: 0x401
register_type: read
value_type: U_WORD
accuracy_decimals: 1
unit_of_measurement: V
device_class: voltage
state_class: measurement
filters:
- multiply: 0.1
- platform: modbus_controller
modbus_controller_id: solax
name: "${prefix} PV1 Input Current"
address: 0x402
register_type: read
value_type: U_WORD
accuracy_decimals: 1
unit_of_measurement: A
device_class: current
state_class: measurement
filters:
- multiply: 0.1
- platform: modbus_controller
modbus_controller_id: solax
name: "${prefix} PV2 Input Current"
address: 0x403
register_type: read
value_type: U_WORD
accuracy_decimals: 1
unit_of_measurement: A
device_class: current
state_class: measurement
filters:
- multiply: 0.1
- platform: modbus_controller
modbus_controller_id: solax
name: "${prefix} Grid Voltage"
address: 0x404
register_type: read
value_type: U_WORD
accuracy_decimals: 1
unit_of_measurement: V
device_class: voltage
state_class: measurement
filters:
- multiply: 0.1
- platform: modbus_controller
modbus_controller_id: solax
name: "${prefix} Grid Frequency"
address: 0x407
register_type: read
value_type: U_WORD
accuracy_decimals: 2
unit_of_measurement: Hz
device_class: frequency
state_class: measurement
filters:
- multiply: 0.01
- platform: modbus_controller
modbus_controller_id: solax
name: "${prefix} Output Current"
address: 0x40A
register_type: read
value_type: U_WORD
accuracy_decimals: 1
unit_of_measurement: A
device_class: current
state_class: measurement
filters:
- multiply: 0.1
- platform: modbus_controller
modbus_controller_id: solax
name: "${prefix} Temperature"
address: 0x40D
register_type: read
value_type: U_WORD
accuracy_decimals: 0
unit_of_measurement: C
device_class: temperature
state_class: measurement
- platform: modbus_controller
modbus_controller_id: solax
name: "${prefix} Inverter Power"
address: 0x40e
register_type: read
value_type: U_WORD
unit_of_measurement: W
device_class: power
state_class: measurement
accuracy_decimals: 0
- platform: modbus_controller
modbus_controller_id: solax
name: "${prefix} Run Mode"
address: 0x40f
register_type: read
value_type: U_WORD
accuracy_decimals: 0
# - platform: modbus_controller
# modbus_controller_id: solax
# name: "${prefix} Output Power"
# address: 0x410
# register_type: read
# value_type: U_WORD
# accuracy_decimals: 0
- platform: modbus_controller
modbus_controller_id: solax
id: ${prefix}_power_dc1
name: "${prefix} Power DC1"
address: 0x414
register_type: read
value_type: U_WORD
unit_of_measurement: W
device_class: power
state_class: measurement
accuracy_decimals: 0
- platform: modbus_controller
modbus_controller_id: solax
id: ${prefix}_power_dc2
name: "${prefix} Power DC2"
address: 0x415
register_type: read
value_type: U_WORD
unit_of_measurement: W
device_class: power
state_class: measurement
accuracy_decimals: 0
on_value:
then:
component.update: ${prefix}_total_dc_power
- platform: template
id: ${prefix}_total_dc_power
name: "${prefix} Total DC Power"
lambda: |-
return (id(${prefix}_power_dc1).state + id(${prefix}_power_dc2).state);
update_interval: never
unit_of_measurement: W
device_class: power
state_class: measurement
accuracy_decimals: 0
- platform: modbus_controller
modbus_controller_id: solax
name: "${prefix} Production Total"
address: 0x423
register_type: read
value_type: U_WORD
accuracy_decimals: 1
unit_of_measurement: kWh
device_class: energy
state_class: total_increasing
filters:
- multiply: 0.1
Thanks for your work.
You Could also add your Registers into my Registers.h JSON and it should work Fine 
asap
just a short update.
from now GROWATT inverters are supported.
Basically, all inverters with mobus-RTU, RS-485 are supported.
Documentation is here:
OpenWB Wallboxes are directly supported
Its also possible to write registers, for example battery SOC
first of all thanx to @tobiasfaust - great work. now mx solax x3 G4 inverters sends all his “secret infomation” to my mqtt server.
homeassistant/SolaxX3/state Online
...
but how can i integrate the inverter into HASS? When i open my MQTT device in home assistant the inverter is not displayed.
i hope someone can help me here, give me a tip.
sorry, i cannot support you regarding integration in HA. My ModbusMqttGateway pushes all values to a standard MQTT Server. Mqtt is a standard protocoll, and if HA supports mqtt, its possible to integrate it.
My ModbusMqttGateway supports many solarInverter types.