Solinteng wattsonic (grid)
The Solinteng wattsonic is a hybrid solar inverter sold under several OEM brand names, used in residential and small commercial PV-plus-storage installations. This Modbus TCP template targets the grid metering function of the wattsonic, reading total grid power at address 11000 and per-phase active power across phases A, B, and C at addresses 10994 to 10998. Phase currents for all three phases are available at addresses 11010 to 11014. Together, these registers give your ModbusCloud portal a complete picture of the grid connection point, enabling real-time import and export monitoring without additional external meters.
- Protocol
- Modbus TCP
- Connection
- Ethernet, Modbus TCP
- Registers
- 7, read only
- Brand
- Solinteng
- Compatible models
- wattsonic
- Last updated
Registers (7)
7 read, 0 write
| Name | Unit | Access | Address (Hidden until you enter your email) | Function (hidden) | Type (hidden) |
|---|---|---|---|---|---|
| power | W | Read | |||
| currents_a | A | Read | |||
| currents_b | A | Read | |||
| currents_c | A | Read | |||
| powers_a | W | Read | |||
| powers_b | W | Read | |||
| powers_c | W | Read |
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Use cases
- Monitor total grid power in real time to verify that the wattsonic is correctly offsetting household load.
- Track per-phase active power on phases A, B, and C to detect phase imbalances across the installation.
- Alert on sustained grid import above a threshold during peak-tariff hours to trigger manual load-shedding decisions.
- Compare phase currents on all three phases to identify wiring asymmetry or unexpectedly high single-phase loads.
- Report daily grid import and export totals from the wattsonic connection point for energy billing verification.
Installation
Enable Modbus TCP on the wattsonic inverter by navigating to the communication or network settings in the inverter app or web interface, then confirm that TCP port 502 is active.
Connect the wattsonic to your local LAN using its native LAN dongle, then confirm the inverter is reachable at its local IP address on port 502 from the same network segment as the ModbusCloud Gateway.
In the ModbusCloud portal, add a new device, import the Solinteng wattsonic (grid) template, and set the Modbus unit ID to 255, which is the default for TCP access via the LAN dongle.
Spot-check the connection by reading register 11000 in the portal live view and comparing the displayed grid power value against the reading shown in the inverter's own app or display.
Things to watch for
Register 11000 returns a value but the sign seems inverted. What is happening?
The wattsonic reports grid power with a sign convention where positive means import and negative means export. Some integration tools apply an automatic scale of -1 to invert this. Check your portal channel configuration and remove any scale inversion if you want raw sign convention as stored in the register.
Phase current registers read values that seem ten times too high. Why?
Registers 11010, 11012, and 11014 store current as uint16 with an implicit scale factor of 0.1, giving the result in amperes. If your integration reads the raw integer without applying this factor, the displayed value will be ten times larger than the actual current. Apply a scale of 0.1 to each current register.
The gateway connects to the inverter but all registers return zero or an error. What should I check?
Confirm the Modbus unit ID is set to 255 for TCP access via the LAN dongle. A wrong unit ID causes the inverter to ignore requests silently or return an exception. Also verify that no firewall rule on the router blocks port 502 between the ModbusCloud Gateway and the inverter IP.
Readings drop out intermittently every few minutes. Is this a known issue?
The wattsonic LAN dongle (espressif-based) is known to produce occasional TCP timeouts under continuous polling. Increasing the poll interval to 10 seconds or more and setting a TCP timeout of at least 10 seconds in the gateway configuration reduces dropout frequency significantly.
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