SofarSolar Inverter (grid)

Installation

1. 1Confirm Modbus RTU is active on the inverter: check the LCD menu or communication settings screen and set the baud rate to 9600, data bits 8, no parity, 1 stop bit, and assign a unique slave ID between 1 and 63.
2. 2Connect the ModbusCloud Gateway to the inverter RS485 port: wire Gateway terminal A to inverter A (positive) and terminal B to inverter B (negative), and enable the termination resistor at each end of the bus if this is the last device in the chain.
3. 3In the ModbusCloud portal, add a new device, select this SofarSolar Inverter (grid) template, and enter the slave ID you configured on the inverter LCD.
4. 4Verify the connection by opening the live register view in the portal and confirming that the power and energy registers return plausible non-zero values during daylight hours.

Things to watch for

01

The gateway connects but all register values read zero or NaN. Why?

The most common cause is a mismatched baud rate or wrong slave ID. Confirm the inverter is set to 9600-8-N-1 and that the slave ID in the portal matches the value in the inverter LCD settings. Also verify that Modbus RTU is actually enabled in the communication menu, as some firmware versions ship with it disabled by default.

02

I am getting garbage or fluctuating values on the phase current registers. What should I check?

SofarSolar registers use big-endian byte order: the high byte is transmitted first. If your reading tool applies a different byte order, the 16-bit current values will appear incorrect. Also confirm you are using function code 3; community reports indicate that only FC 03 reliably returns data on these inverters through the built-in logger port.

03

The RS485 connection keeps dropping every few minutes. How do I fix it?

A common fix is to swap the A and B wires: the polarity markings on some SofarSolar inverter RS485 connectors do not match the standard convention. Keep the link at 9600 bps. Also ensure termination resistors are fitted at both physical ends of the RS485 bus, and keep total cable length within recommended limits for RS485.

04

The 32-bit energy register reads an implausibly large number. What is wrong?

The energy register at address 544 is a uint32 spanning two consecutive 16-bit Modbus registers. Confirm your register read request covers both registers (address 544, quantity 2) and that the high word is placed first. Misreading a single register instead of a two-register pair is the most frequent cause of wildly incorrect energy totals.

Registers (5)

5 read / 0 write

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