Solax X3-MIC G2 (grid)
The Solax X3-MIC G2 is a three-phase, grid-connected PV string inverter for residential and light commercial solar installations. This template reads the inverter via Modbus TCP through the Solax PocketWiFi or PocketLAN dongle, exposing two key registers: instantaneous AC output power and cumulative energy yield. With these values in your ModbusCloud portal you can track live generation, build yield reports, and set production alerts without relying on a proprietary cloud account. Supported devices include the X3-MIC G2, X3-PRO G2, Q.VOLT P5T-X, and Q.VOLT P17T-X.
- Protocol
- Modbus TCP
- Connection
- Ethernet, Modbus TCP
- Registers
- 2, read only
- Brand
- Solax
- Compatible models
- X3-MIC G2 · X3-PRO G2 · Q.VOLT P5T-X · Q.VOLT P17T-X
- Last updated
Registers (2)
2 read, 0 write
| Name | Unit | Access | Address (Hidden until you enter your email) | Function (hidden) | Type (hidden) |
|---|---|---|---|---|---|
| power | W | Read | |||
| energy | Wh | Read |
Loading registers…
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If a device is not in the library yet, we build the template for free as soon as we have the register data.
Use cases
- Monitor real-time AC output power to verify the inverter is producing at expected levels during peak sun hours.
- Track cumulative energy yield over weeks and months to confirm system performance against design estimates.
- Alert on a sudden drop to zero watts during daylight to detect tripped AC breakers or inverter faults quickly.
- Compare daily yield trends across multiple Solax X3-MIC G2 sites to identify underperforming installations.
- Report monthly energy generation totals to building owners or feed data into invoicing for on-site energy contracts.
Installation
Insert a Solax PocketWiFi 3.0 or PocketLAN dongle into the inverter's dongle port, connect it to your local network, and confirm it obtains an IP address accessible from the ModbusCloud Gateway.
Connect the ModbusCloud Gateway to the same LAN segment as the dongle, ensuring no firewall blocks TCP port 502 between Gateway and dongle IP.
In the ModbusCloud portal, add a new device, select the Solax X3-MIC G2 (grid) template, enter the dongle's IP address, set port to 502, and set the Modbus unit ID to 1 (the factory default).
Trigger a manual poll in the portal and verify that the power register returns a non-zero watt value during daylight; if zero, confirm the dongle's local web UI shows live inverter data.
Things to watch for
The gateway connects but both registers return zero at midday.
Confirm the inverter is producing by checking the dongle's local web UI. If the UI shows power but ModbusCloud reads zero, verify the unit ID is 1. Some dongles ship with unit ID 0; try both. Also ensure no other Modbus client (such as a home automation system) is holding the single allowed TCP connection open, as the X3-MIC G2 permits only one Modbus TCP client at a time.
Why does the energy register value seem far too large or implausible?
The energy register is a uint32 read via function code 4 spanning two consecutive 16-bit Modbus words. If your polling tool reads only a single 16-bit word it will capture only the low word, producing a wrong value. Confirm your client reads a 32-bit (2-register) block starting at address 1087. ModbusCloud handles this automatically via the template definition.
Connection to the dongle times out even though the dongle is online.
The Solax PocketWiFi 3.0 and PocketLAN dongles forward Modbus TCP on port 502, but only PocketWiFi 3.0 and later support this. Earlier PocketWiFi versions and PocketLAN do not expose a Modbus TCP endpoint. Verify the dongle model and firmware version in its local web UI, and upgrade firmware if available.
Readings disappear intermittently every few minutes.
The inverter's dongle allows only one simultaneous Modbus TCP connection. If SolaXCloud polling or another local client is active, it may periodically take the connection and block the Gateway. Dedicate the dongle to ModbusCloud polling, or use a TCP multiplexer proxy to share the single connection across clients.
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