No data appears after importing the template. What should I check?

Confirm the Modbus slave ID in the portal matches the ID set on the inverter display. Also check that the baud rate in the portal matches the inverter setting, which defaults to 9600 or 19200 baud depending on firmware. A mismatch on either setting will cause all registers to return timeout errors.

Phase voltage registers return implausible values. What is wrong?

Solax X3-PRO G2 input registers report voltage with a scaling factor of 0.1, meaning a raw value of 2300 equals 230.0 V. If your portal display shows raw integer values without scaling applied, check your template scaling configuration. Confirm you are reading input registers using function code 4, not function code 3.

The gateway connects but power reads zero even in full sun.

The inverter only populates output registers when it is actively feeding the grid. If the inverter is in standby, fault, or night mode, the power register will return zero legitimately. Check the inverter display for any active fault codes before suspecting a communication problem.

RS485 communication is intermittent and drops regularly.

Check cable polarity: RS485 A and B leads must not be swapped. Ensure no other device on the same RS485 bus shares the same slave ID as this inverter. For bus runs longer than 15 metres, a 120-ohm termination resistor at each end of the bus can eliminate reflections causing framing errors.

Free Modbus template: Solax X3-PRO G2 (pv)

The Solax X3-PRO G2 is a three-phase on-grid string inverter for residential and commercial PV installations, covering models X3-MIC G2, X3-PRO G2, and their Qcells-branded equivalents Q.VOLT P5T-X and Q.VOLT P17T-X. This ModbusCloud template reads the inverter over Modbus RTU via the RS485 port, collecting total AC output power, cumulative energy yield, and per-phase voltages and currents across all three phases. Connecting the Solax X3-PRO G2 to your ModbusCloud portal gives you continuous visibility into generation performance and phase balance without relying on a cloud service.

Name	Address	Function	Type	Unit	Access
power Total AC output power of the inverter, in watts.	1038	FC04	uint16	W	R
energy Cumulative AC energy yield, total lifetime generation.	1059	FC04	uint32	Wh	R
currents_a AC output current on phase A.	1034	FC04	uint16	A	R
currents_b AC output current on phase B.	1035	FC04	uint16	A	R
currents_c AC output current on phase C.	1036	FC04	uint16	A	R
voltages_a AC grid voltage on phase A.	1028	FC04	uint16	V	R
voltages_b AC grid voltage on phase B.	1029	FC04	uint16	V	R
voltages_c AC grid voltage on phase C.	1030	FC04	uint16	V	R

Solax X3-PRO G2 (pv)

Overview

Use cases

Installation

Things to watch for

Registers (8)

Working with Modbus in your projects?

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