Do I need a Cerbo or GX device?
Not every Victron installation needs one. The decision comes down to whether you only want to configure individual devices—or want the whole system to think, report and respond as one.
You can often skip GX if your devices work independently and local setup is enough.
A GX device brings connected equipment into one view and supports VRM monitoring.
ESS, managed batteries, generators and complex systems commonly need GX.
The short answer
You do not need a Cerbo GX simply because you own Victron equipment. You need a GX device when you want those products to operate as a connected system instead of a collection of separate boxes.
A GX device is the communication center. It gathers information from compatible chargers, inverter/chargers, battery monitors, managed batteries, tanks and sensors. It can show that information locally, send it to the VRM portal and support system-level control.
You probably want a GX device if…
- You want to monitor the complete installation remotely through VRM.
- You want one screen for solar, batteries, AC loads, shore or grid power and generator status.
- You are building an ESS or another system that needs coordinated control.
- You use a managed lithium battery whose BMS must communicate with the wider system.
- You want generator start/stop logic, relay control, tank inputs or alarm reporting.
- You expect the system to grow and want one integration point.
You can often skip it if…
- Your setup is small and the devices do not need to coordinate.
- You are happy checking and configuring each compatible device nearby with VictronConnect.
- You do not need internet monitoring, system history or remote alarms.
- Your existing inverter/charger already has “GX” in its product name.
What a Cerbo GX does not replace
It is not an inverter, charger, battery monitor or internet connection. Think of it as the system coordinator. It still needs compatible equipment, the correct communication cables or interfaces, and a network connection if you want VRM access away from the boat.
It also does not automatically mean you need a dedicated GX Touch display. A touch display is convenient for a fixed local screen, but you can also access the GX interface from a phone, tablet or computer on the local network.
Using a Cerbo GX with Starlink
Yes—a Cerbo GX works with Starlink, and VRM remote monitoring works on Starlink’s network. Two things are worth knowing:
- Turning Starlink off to save power? When Starlink comes back on, the Cerbo can get stuck offline (VRM error #153) instead of reconnecting. Turning the Cerbo’s Wi-Fi off and on fixes it, or you can enable the GX’s automatic reboot when it loses connection.
- Starlink updates itself every few days. Its router restarts during updates, which can leave VRM offline for a few hours.
What a typical Cerbo GX system looks like
Here is how a common boat setup connects: a Cerbo GX with GX Touch display, two SmartSolar MPPT 100/50 solar chargers, a MultiPlus 12/3000, a BMV-712 battery monitor and three 12V lithium batteries in parallel, with Wi-Fi for VRM remote monitoring.
Swipe sideways to see the full diagram.
Things people often miss
- Every negative goes through the shunt. Chargers, the inverter and all DC loads connect to the system side of the BMV shunt, never directly to the battery. Otherwise the BMV reads the wrong state of charge.
- Wire the bank diagonally. Take the positive from the first battery and the negative from the last, so all three batteries share the load evenly.
- Check your batteries can feed the MultiPlus. A 12/3000 can pull around 300A from the batteries at full load. Make sure the combined BMS current rating of your three batteries covers it.
- Lithium settings matter. Set the MPPTs and MultiPlus to your battery maker’s charge voltages. If your battery’s BMS can talk to a Cerbo over CAN, connect it to the BMS-Can port. If not, the BMV-712 is your state-of-charge source.
- Add PV disconnects. Each solar array should have its own breaker or isolator before its MPPT.
Cerbo GX, built-in GX, or neither?
| Situation | Best starting point | Why |
|---|---|---|
| Small, stand-alone system | No GX device | Keep it simple and use VictronConnect with compatible products. |
| New system with separate components | Cerbo GX | A flexible central hub with broad connection and I/O options. |
| MultiPlus-II GX or EasySolar-II GX installed | Use the built-in GX first | You already have the core GX function. Compare its ports and I/O before adding anything. |
| Permanent local display wanted | GX device + compatible touch display | Adds a convenient dedicated interface; the display itself is not the system brain. |
| Complex or specialized installation | Compare GX models | Port count, CAN interfaces, inputs, relays and display needs should drive the choice. |
Common questions
Can I add a Cerbo GX later?
Yes. A small system can start without GX and add one when remote monitoring, more devices or automation make it worthwhile. Plan accessible cable paths and network coverage if future expansion is likely.
Do I need a GX Touch?
No. The GX Touch is an optional local display. Many owners use phones, tablets or computers for local access and VRM for remote access.
Does the Cerbo GX include internet service?
No. Connect it to an available network by Ethernet or supported Wi-Fi options. Cellular access requires separate equipment and service.
Does every lithium battery system need GX?
Not every battery does, but managed batteries and coordinated systems may have specific communication requirements. Follow the battery, BMS and Victron system manuals for the exact design.
Buy GX for coordination—not because it appears on every diagram.
If you only need local setup and device-by-device checks, start without it. If you want one coherent system with remote visibility, shared measurements or automation, a GX device is usually the right foundation.
Before you order: list every device you want to connect and the port each one uses. Check whether your inverter/charger already includes GX, then compare the remaining ports, relays and inputs with the current GX product table.
General planning guidance, not a wiring or commissioning manual. Always check the current manuals for your exact products and system design. Official references: Victron GX product range and Cerbo GX.