Sungrow SG8.0RS + Tesla Powerwall 2 + Amber + Home Assistant + PowerSync (Confirmed Working)
After months of trial and error, I've finally managed to get my Sungrow SG8.0RS inverter working with Home Assistant, PowerSync, Amber Electric and a Tesla Powerwall 2.
Hopefully this saves someone else a lot of frustration.
My Hardware
- Sungrow SG8.0RS inverter
- Sungrow WiNet-S communication dongle
- Sungrow 3-Phase Smart Meter
- Tesla Powerwall 2
- Amber Electric
- Raspberry Pi 5
- Home Assistant
- PowerSync
Firmware Versions Confirmed Working
WiNet-S
WINET_B000.V042.P001
SG8.0RS
SUNSTONE-S_B000.V001.P049-20251122
The Problem
For a long time I could monitor my system but couldn't properly control it.
Many people (including myself) assumed the SG8.0RS could not be curtailed or controlled properly through Home Assistant and PowerSync.
Modbus appeared unavailable, controls were hidden, and PowerSync could not perform the functions I wanted.
The Breakthrough
The breakthrough came after updating BOTH:
- WiNet-S firmware
- SG8.0RS firmware
After the update, additional controls became available in:
- O&M (Installer) settings
- End User settings
Important Discovery
Some settings did not appear to save correctly the first time.
I had to repeatedly toggle certain options:
- On / Off
- Open / Close
- Enable / Disable
multiple times before they actually changed state.
After changing them, I saved the settings in the End User menu.
Only after doing this did Modbus and remote control functions become available.
What I Enabled
O&M Controls
Enable installer/O&M access.
End User Controls
Enable user control functions and remote operation settings.
Modbus
Enable Modbus communication and confirm Modbus TCP becomes available.
I verified Modbus communication through Home Assistant.
Results
The following are confirmed working:
Home Assistant integration
PowerSync integration
Tesla Powerwall 2 integration
Amber Electric optimisation
Remote access via Tailscale
Modbus TCP communication
Inverter Shutdown
Inverter Restore
DC Solar Curtailment
Export control using Smart Meter feedback
Tesla Powerwall Behaviour
The Powerwall acts as the first buffer.
PowerSync can optimise battery charging and discharging while monitoring:
- Amber prices
- Battery SOC
- Solar production
- House load
When necessary, PowerSync can also curtail solar generation on the Sungrow side.
Home Assistant Setup
Home Assistant running on:
- Raspberry Pi 5
Additional software:
- PowerSync
- Tailscale
- Termius
Remote control and monitoring work from anywhere.
My Conclusion
The SG8.0RS CAN be controlled.
The missing piece for me was:
- Updating firmware.
- Enabling O&M controls.
- Enabling End User controls.
- Making sure settings actually saved.
- Opening Modbus access.
- Using a Sungrow Smart Meter.
Once those pieces were in place, PowerSync was able to communicate with the inverter and perform curtailment functions.
Hopefully this helps the next person trying to combine:
- Sungrow SG8.0RS
- Tesla Powerwall 2
- Amber Electric
- Home Assistant
- PowerSync
without spending months figuring it out.
Happy to answer questions if anyone is trying to build a similar setup.