This repo enables access to Sunsynk Hybrid Inverter through a Python 3 library. It also provides an Add-On that can be installed in the Home Assistant OS.
See https://www.sunsynk.org/ for more information on Sunsynk inverters.
This code was developed on a Sunsynk 5.5 kWh.
DISCLAIMER: Use at your own risk! Especially when writing any settings.
The Python library is available through pip:
pip install sunsynkFor the Add-On you require Home Assistant OS and a RS-485 adaptor to connect to your Sunsynk inverter. Sensors are read using the Modbus protocol and sent to a MQTT server. Below an example of the HomeAssistant Energy management dashboard using sensors from the Sunsynk.
- Add the repository to your HA Supervisor
https://github.com/kellerza/sunsynk - Install the Sunsynk Add-On from the Add-On Store and configure through the UI
The Sunsynk Add-on runs on the Home Assistant OS, reads the Inverter's Modbus registers over RS-485, and publishes sensor values to the MQTT server. The architecture is shown below:
If the Inverter is far from the server/SBC running Home Assistant, you have several ways to extend the deployment:
-
The preferred remote option is to use MQTT over your home network toward the main MQTT server (typically on the same server as Home Assistant)
-
Another option is to use a Modbus TCP to RTU/serial gateway. This can be another Raspberry Pi, even an old one, running the gateway software, like mbusd.
You can also use a commercial Modbus gateway, like the USR-W630 (reported via Powerforum)
There are several inverters that are rebranded Deye inverters, so you might have success with other inverter brands as well, please add your inverter by editing this file and creating a Pull Request if you are successful.
| Inverter Model | Battery | Version | User | Port(s) |
|---|---|---|---|---|
| Sunsynk 3.6kW | Sunsynk SSLB1 | beta/all | @reedy | BMS485 (top left) |
| Sunsynk 5.5kW | Hubble AM-2 | beta/all | @kellerza | BMS485 (top left) |
| Sunsynk 8.8kW | BSL 8.2 kWH | 0.0.8 | @dirkackerman | RS485 (1 in image below) |
| Deye 8kW | Pylontech US3000C | 0.1.3dev | @Kladrie | RS485 (top left) |
| Turbo-E 5kW | DIY with JKBMS | 0.1.4 | @agtconf | BMS485 (top left) |
Tested with: USB-to-RS485 adaptor sourced from Banggood, very similar to this.
NOTE: RJ-45 port marked RS485 (bottom right) does not work.
Tested with: USB-to-485 adaptor sourced from Micro Robotics, here
RS485 is the blue line - top left, as with the Sunsynk inverters. Yellow is the CAN-comms with the Pylontech batteries
Tested with: USB-to-RS485 adaptor sourced from Aliexpress, very similar to this.
The RJ-45 plug on the inverter side is crimped according to T568A. RS485 requires a twisted pair, so works well with CAT5 network cable and the RJ-45 connectors.
| RJ45 Pin (inverter side) |
Wire Color (using T568A) |
USB-to-RS485 adaptor |
|---|---|---|
| 1 | Green-White | B/D- |
| 2 | Green | A/D+ |
| 3* | Orange-White | GND |
* tested on Sunsynk 8.8kW only
If you fail to get a reply from the inverter, please check the following
Ensure you only have a single addon connected to the serial port. The following can all potentially access the USB port: mbusd, Node RED, the normal and dev addon version.
If you need to have multiple connections to the serial port: ONLY connect mbusd to the serial port. Connect all addons to mbusd (e.g. tcp://192.168.1.x:503 )
Ensure the Modbus server ID (MODBUS_SERVER_ID config setting) setting matches the configured Modbus SN value of the inverter
View/update the Modbus server ID on your inverter under "Advanced Settings" / "Multi-Inverter"
Information in the Power forum was especially helpful to get this up and running, see this thread
Special Kudos to Bloubul7, @jacauc and Sc00bs.
The original Node-RED flows can be found on @jacauc's repo here
Sunsynk 8.8kW diagram from system32 in this thread