This project provides PlatformIO code for building a custom Wi-Fi enabled monitoring device for Sungrow S100 energy meters. It collects all available metrics through the meter's RS485/MODBUS interface and sends them to InfluxDB v2 or MQTT. The solution works alongside the inverter that the S100 is typically connected to - it unobtrusively monitors communications while the inverter is running, and takes over in requesting/reporting metrics if the inverter is offline (e.g. during the night).
- An ESP32-C3 SuperMini board. They're small, cheap and well suited to this project.
- A TTL to RS485 adaptor, many of which are available on eBay and Aliexpress. I recommend the type depicted below as they have built-in level shifting, flow control and transient protection.
- A 2-way Ethernet splitter, allowing the S100 to connect to both the inverter and the RS485 adaptor.
- An old Ethernet cable you're willing to sacrifice. This will plug into the Meter/DRM RJ45 jack on the inverter and S100 via the Ethernet splitter.
- A short Ethernet cable to connect the Ethernet splitter to the inverter.
| ESP32-C3 SuperMini | TTL to RS485 adaptor |
|---|---|
| GPIO-1 | TXD |
| GPIO-0 | RXD |
| GND | GND |
| 3v3 | VCC |
| Ethernet cable | TTL to RS485 adaptor |
|---|---|
| RJ45 Pin 8 (T568B Brown) | A+ |
| RJ45 Pin 6 (T568B Green) | B- |
The Ethernet splitter is connected to the S100, inverter and RS485 adaptor.
RobTillaart for RunningAverage
Tobias Schürg for InfluxDB Client
- Initial release
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