Direct wired access to your Conow energy device over standard Modbus RTU. No cloud account, no internet, no vendor lock-in. Your data never leaves your network.
Any EMS, any platform, any language that speaks Modbus can read and control your device. Zero learning curve if you have used Modbus before.
Battery SoC, grid power, PV input, charge/discharge — all readable from registers 10000–10036, polled every 5 seconds.
Power limits, off-grid switch, force charge/discharge — writable via registers 10100–10107. Instant write + read-back.
Plain Modbus RTU over RS-485. Works with Home Assistant, ioBroker, openHAB, Node-RED, or your own Python script.
Nothing leaves your local network. No API keys, no cloud tokens, no telemetry. The wire is the only connection.
Full Modbus register documentation published on GitHub — addresses, data types, scale factors, frame examples.
Default 5s interval balances responsiveness and RS-485 bus load. Write commands trigger immediate read-back.
Connect a USB-to-RS485 adapter between your Home Assistant host and the Conow device RS-485 port. Match A/B polarity exactly to the device label — reversed polarity is the most common wiring mistake.
Recommended: FTDI-based or CH340-based adapters with screw terminal blocks. Twisted-pair cable up to 30 m works reliably at 38400 baud.
| Parameter | Value | Notes |
|---|---|---|
| Baud rate | 38400 | Factory default |
| Data bits | 8 | 8N1 |
| Parity | None | — |
| Stop bits | 1 | — |
| Slave address | 160 (0xA0) | Default; configurable |
Installing the Conow Local integration via HACS — search, install, configure serial port and slave address.
The device must be commissioned and online in the Conow ECO App at least once. RS-485 will not work on a factory-fresh device that has never been activated.
Modbus RTU is disabled until you turn on external control. In the Conow ECO App:
⚠️ Until DIY Mode or External Control is enabled, the device will not respond to Modbus commands.
Connect an RS-485 to USB adapter between your Home Assistant host and the device RS-485 port. Match A/B polarity to the device label.
Add the repository as a custom HACS integration, install "Conow Local", restart HA.
Full documentation at conow-labs/developer-docs → modbus/
Modbus RTU data flow: device registers → 5-second polling → real-time energy dashboard values.
Real-time energy flow in Home Assistant — battery SoC, PV input, grid export, all from local Modbus polling. No cloud required.
When Modbus communication is polling, the device only follows Modbus commands. App/Cloud DIY instructions are not applied simultaneously.
Modbus real-time control and platform/App DIY schedule are independent. Only one path is active at a time.
Even though Modbus takes priority at runtime, you must keep DIY Mode or External Control turned on in the App.
Only one program can use the serial port at a time.
| Device | Type | Protocol Doc |
|---|---|---|
| CBE2000 Pro | Balcony solar storage (all-in-one) | modbus/balcony-solar-storage.md |
| Lyra 2500 AC / Pro | AC-coupled storage | modbus/balcony-solar-storage.md |
| Atlas Series | High-capacity storage | modbus/ (coming) |
Full register documentation, code examples, and HA integration — all open source.