Nucleo GX Manual

All supported energy meter types can be assigned the role of AC meter.

To do this, go to: Settings → →Integrations Energy meters via RS485 → [your_energy_meter] → Role and select AC meter as the role (alternatives include Grid, PV Inverter, and Generator).

Devices with a VE.Direct port, such as BMV battery monitors, MPPT solar chargers, Orion XS, and Smart IP43 Chargers, can be directly connected to a GX device via VE.Direct.

There are two VE.Direct cable types available:

VE.Direct to VE.Can interface (limited use)

The VE.Direct to VE.Can interface can be used only with:

Not compatible with:

This interface does not convert data for those devices into CAN-bus messages.

If using the VE.Direct to VE.Can interface:

Connecting more VE.Direct devices to your Nucleo GX than physical VE.Direct Ports

If you need to connect more VE.Direct devices than there are VE.Direct ports, the following options are available:

Please refer to the Overview of connections section for details on the maximum number of VE.Direct devices that can be connected.

Notes on older VE.Direct MPPTs

Some older models, like the MPPT 70/15, are not compatible with GX devices unless they meet a minimum hardware revision:

To identify your model:

To connect a product with a VE.Can port, use a standard RJ45 UTP cable (available with straight and elbow connectors).

Important:

Terminate the VE.Can network at both ends using VE.Can terminator. A bag with two terminators is included with each VE.Can product. Additional terminators are  available separately.

Compatibility notes

VictronConnect-Remote (VC-R) support

The following VE.Can products support VictronConnect-Remote (VC-R), enabling configuration and monitoring via VRM. For more details, refer to the VictronConnect manual.

The Nucleo GX has two fully functional VE.Can ports. They are independent from a data and connected device perspective. One is labelled VE.Can 1 and is galvanically isolated, the other is labelled VE.Can 2 and is non-isolated.

Usage guideline

Important

Port configuration

Notes

The Inverter RS, Inverter RS Solar, and Multi RS are equipped with both VE.Direct and VE.Can interfaces. However, for these products:

The VE.Direct interface on these models is intended solely for programming, using a VE.Direct to USB adapter.

Exception: MPPT RS

The MPPT RS can be connected to a GX device via either VE.Direct or VE.Can, depending on system requirements and available ports.

See the VE.Can resistive tank sender adapter manual for details about the adapter.

Connection guidelines

The GX Tank 140 is an accessory for the Victron GX range of system monitoring products. It supports up to four tank-level sensors, with readings visible locally on the GX device and remotely via the VRM Portal.

Input compatibility The GX Tank 140 supports: Current senders (4–20 mA) Voltage senders (0–10 V) Connection and power The device connects to the GX system via USB, which also powers the unit. No separate power supply is required for the GX Tank itself. To simplify installation, two of the four inputs provide an integrated 24 V supply for powering compatible senders. The remaining two channels require external power, which can be supplied via the power input terminal with fused outputs provided. Configuration options Upper and lower limits are configurable, allowing compatibility with partial-scale sensors (e.g. 0–5 V). For marine applications, tank level data can be transmitted via NMEA 2000, enabling display on third-party equipment such as MFDs (Multifunction Displays). For full technical details, refer to the documentation available on the GX Tank 140 product page.

The Victron VM-3P75CT is a versatile energy meter for monitoring single-phase and three-phase power and energy consumption. It can be used to measure:

The meter calculates power values for each phase and transmits the data at a high refresh rate over VE.Can or Ethernet.

Key features

Installation

VE.Can connection: Plug-and-play. No manual activation required.

Ethernet connection: After initial installation, the energy meter must be activated:

In the GX device menu, go to Settings → Integrations → Modbus Devices → Discovered devices and enable the discovered energy meter; it's disabled by default when first installed and powered.
The VM-3P75CT then becomes visible in the device list and can be monitored from there. For more details, see the energy meter manual.

The EV Charging Station and EV Charging Station NS, with both three-phase and single-phase charging capabilities, integrate seamlessly into the Victron environment via a GX device connection over WiFi. Operation and monitoring are easily managed via Bluetooth using the VictronConnect App.

Set up and configure the EVCS according to the instructions in the EV Charging Station manual. Ensure that:

GX device setup

On the GX device, navigate to: Settings → Integrations → Modbus TCP Server, and enable Modbus TCP Server. Then go to: Settings → Integrations → Modbus Devices → Discovered devices, and enable the detected EVCS. Note: EV Charging Stations connected before updating the GX device to firmware version 3.12 will be activated automatically. New devices must be enabled manually via the above menu. Once activated, the EVCS will appear in the device list, where it can be monitored and controlled. For further details, refer to the EV Charging Station Manual. Control of the EVCS is also available from the control pane by tapping the control pane button in the top left corner of the user interface.

The GX IO-Extender 150 is a USB-connected expansion module that extends the available IO ports of GX devices such as the Ekrano GX, Nucleo GX and Cerbo GX.

It bridges the gap between your GX device and the external world, creating endless possibilities for monitoring, control, and automation.

Features

The plug-and-play USB connectivity makes installation effortless. The GX IO-Extender 150 is simply plugged into an available USB port on the GX device and the inputs/outputs, PWMs and relays immediately become available to the system.

Whether you're managing a complex off-grid solar installation, a marine electrical system, or an industrial backup power solution, the GX IO-Extender 150 expands your ability to deliver on specific requirements:

The GX IO-Extender is not intended to be used for general load switching, but rather for signalling. The relays and solid switch have low current ratings that vary based on the voltage being used. Compatible products like those from Energy Solutions (UK), Garmin (USA) and Safiery, and others will be better suited for general switching applications.

Installation

For installation details and technical specifications, refer to the GX IO-Extender 150 manual.

GX device configuration

Once connected and powered, the GX IO-Extender 150 will appear in the Devices list on the GX device. The GX IO-Extender device's page displays: Module state Output state PWM percentage Output mode A dedicated Setup menu allows configuration of each output individually. On each individual output page in the Setup menu, the following options are available: Custom name – Assign a unique name to the output. (Note: the module name can be changed via the Device menu). Group: Allocate the output to a group. Type: Select the output mode: Latching (Toggle), Momentary, or Dimmable. Show controls: Enable or disable visibility of the output in the Switch pane.

Grouping outputs

Each output can be grouped by assigning a group name on the channel’s setup page. Outputs with the same group name are displayed together in a single group card on the Switch pane. This makes it easy to combine related outputs, for example, grouping all lighting outputs under one tile. Channels without a group name will appear in a card labelled with the module name.