Installation · SolaX

Install GridZeno on SolaX X3-MIC.

X3-MIC G2 is a three-phase grid-tied inverter without a battery, so GridZeno can show the production and, where the protocol allows it, limit the export. There's no battery to control. RS485 is on pins 4 and 5 in the RJ45 port RS485. Pin 1 carries 12 V, so the inverter end is crimped with only the two wires that are needed.

Applies to: X3-MIC 3-15K-G2
Connection: Network cable with RJ45 plug
Time: About 25 minutes

A grid inverter without a battery. GridZeno shows what it produces but can't control anything on it. What GridZeno can do on SolaX X3-MIC

How the dongle recognises it: The serial number in holding 0x300 starts with, for example, MC806T, MU806T, MC106T, MC203T-MC215T or PU: X3-MIC G2.

GridZeno Dongle for SolaX X3-MIC

What you need

GridZeno Dongle: The device ID is on the label, e.g. GZ-A1B2C3.
Cable: A network cable that's re-crimped at the inverter end with only two wires.
RJ45 plug and crimping tool: For the inverter end. The waterproof connector with RJ45 comes with the inverter in the accessory bag.
USB power: A 5 V USB charger and a cable with USB-C.

The port

On the underside of the inverter, behind a protective cover. The cable is passed through the waterproof connector with RJ45 from the accessory bag.

Port: RS485 terminal

The RS485 port, with the pins numbered as SolaX numbers them. Pins 4 and 5 are RS485, pin 1 carries 12 V. The plug shown with the contacts facing you and the locking tab at the back: pin 1 is furthest to the left.

Pin 4 A, RS485_A
Pin 5 B, RS485_B
Pin 1 Must not be connected, +12V

The cable

A network cable where the inverter end is crimped with only two wires: the dongle's A on pin 4 and B on pin 5. The rest of the positions in the plug are empty. SolaX counts the GND on pin 6 as part of the heat pump control, not RS485, so the white/green wire isn't used. An ordinary straight cable doesn't work here: it would put the dongle's GND on pin 3, the heat pump control.

From the dongle to the inverter
Dongle end	Inverter end
Dongle pin 4, blue (A)	SolaX pin 4, RS485_A
Dongle pin 5, white/blue (B)	SolaX pin 5, RS485_B
The other wires	Cut off and insulated, especially the one on pin 1

Settings

On the inverter

Settings > RS485 CommAddr: 1, as set at the factory. Settings requires the installer code, which is 2014 from the factory.
Settings > Modbus Function > Function Select: COM485, not Ev Charger.

In GridZeno's Welcome

The inverter is chosen in GridZeno: in Welcome the first time, and later under System, Change inverter. The dongle fetches its setup from there.

Manufacturer and model: SolaX, X3-MIC
Connection: By cable (RS485)
RS485 settings: Address 1 and 8N1. SolaX doesn't mention the baud rate in the manual: start with 9600, and try 19200 if the dongle gets no answer.

Step by step

Each step has a small drawing that shows what to do.

1
Check the address
In the display, go to Settings, and type the installer code. Under RS485 CommAddr the address must be 1, as set at the factory. Under Modbus Function, Function Select must be set to COM485.
2
Pass the cable through the waterproof connector
Take apart the waterproof connector with RJ45 from the accessory bag. Cut off the plug at the inverter end, and pass the cable through the connector's parts.
3
Crimp the inverter end with two wires
Strip 15 mm. Crimp the RJ45 plug on with blue (A) on pin 4 and white/blue (B) on pin 5. The other wires are cut off and insulated. Assemble the waterproof connector, but don't tighten it yet.
4
Take the protective cover off
Switch the inverter off, and take the protective cover off the RS485 port on the underside.
5
Plug it into RS485
Press the plug into the RS485 port until it clicks, and tighten the waterproof connector by hand.
6
Plug the RJ45 end into the dongle
The cable's other end goes into the dongle's RS485 port. Place the dongle somewhere dry and close to the inverter, so the cable doesn't hang from the plug.
7
Connect power to the dongle
Plug the USB-C cable into the dongle and the charger into a socket. The dongle starts by itself. It gets power from the charger, not from the inverter.
8
Connect the dongle to the network
Over Wi-Fi: the first time, the dongle creates its own Wi-Fi, GridZeno-Setup- followed by the last characters of the device ID. Connect your phone to it, choose your own network, enter the password, and press Save and connect. When it says Connection OK, press Go to GridZeno. Over cable (LAN): plug a network cable from the router into the dongle's network port.
9
Log in, and choose your inverter
Log in to GridZeno. Welcome pairs the dongle with its device ID. Then choose your inverter, SolaX X3-MIC, and the connection By cable (RS485). Press Save inverter, and the dongle fetches its setup and reads the inverter. If the dongle gets no answer, go to System, press Change inverter, and set the baud rate to 19200 under RS485 settings.

The dongle's own setup is described with screenshots in The user guide, and the pairing in Getting started.

Take care

Pin 1 in the RS485 port carries 12 V. An ordinary network cable connects all eight pins, so the inverter end must be crimped with only the two wires.

The RS485 port is the inverter's only RS485 port, and SolaX uses the same pins 4 and 5 for the energy meter, DataHub, Adapter Box G2 and the EV charger. Pins 1 to 3 and 6 are DRM and heat pump control. If there's already a cable in the port, write to us before you connect the dongle.

The Dongle port is for SolaX's own Pocket WiFi. The dongle doesn't go in it.

The RS485 port isn't a network port. Never plug it into a router or switch.

What GridZeno can control on SolaX X3-MIC, and how, is on the page about SolaX X3-MIC. If you're stuck, write to us with the model name.

Source

Ports, pins and menus are from the manufacturer's own manual: SolaX X3-MIC G2 3-15 kW User Manual, Version 17.0 (2025-10-15), Sections 8.5, Communication Connection (table 8-4, Pin Definition), and 10.4, Detailed Operation of Settings (RS485 CommAddr and Modbus Function).