Victron Cerbo GX MK3 vs MK2: What Changed, and Which One Your System Needs

The GX device is the communication center of a Victron system — the box that ties your inverter/charger, solar chargers, and battery monitor together and puts all of it on your phone and in VRM. Victron has now released the Cerbo GX MK3: the same box and the same ports as the MK2, with a completely upgraded brain inside. In the video above, Wesley walks through what actually changed, which systems benefit, and — just as important — where the Cerbo GX MK2 is still a smart buy.

What actually changed

The headline is the processor. The MK2 runs a 1.2 GHz dual-core chip whose design dates back to the original Cerbo. The MK3 steps up to a 64-bit quad-core with DDR4 memory (up from DDR3), and the result is roughly three times the processing power of the MK2.

The second change matters just as much on bigger systems: the MK3 supports up to 25 VE.Direct devices, up from 15 on the MK2. That's the ceiling that large installs with many solar chargers and battery monitors kept bumping into. More MPPTs, more SmartShunts, one hub.

In day-to-day use, the extra horsepower shows up as a snappier remote console, faster Node-RED flows, and real headroom to run Signal K and the Venus OS Large image — the territory where the MK2 ran short on resources.

What stayed the same

Everything an installer touches. The MK3 keeps the same VE.Bus port, two VE.CAN ports, three VE.Direct ports, USB, Ethernet, WiFi and Bluetooth, and the same tank and temperature inputs as the MK2. It's a drop-in swap: your existing cabling, your mounting location, and your GX Touch display all just work.

Who should go MK3

Bigger boats with multiple MPPTs and lots of solar coming in. Large battery banks with DC-DC chargers and several monitors — anywhere there's simply more to measure. Large off-grid and ESS systems managing a ton of solar, especially if you've gotten anywhere near the old 15-device VE.Direct limit. And anyone running (or planning to run) Node-RED, Signal K, or Venus OS Large — that's exactly where the new quad-core pays off.

It's also the right call for a new, ground-up build you intend to keep for years: Victron keeps adding features to the GX platform, and the MK3 gives you the headroom to grow into them.

When the MK2 is still the smart buy

The MK2 is not obsolete. Vans, weekend cruisers, and small cabin systems — an inverter, a solar charger or two, a battery monitor — are well inside what it handles easily. Remote monitoring in VRM, alarms, generator auto-start: the MK2 does all of it, and day to day you won't feel the difference on a system that size.

At our store the math is simple: the Cerbo GX MK3 is $333.20 and the Cerbo GX MK2 is $272.85 — about $60 less for a unit that fully covers a simpler system.

And if you already have a MK2 (or an original Cerbo) that's working well, there's no reason to rip it out. Upgrade when you add enough devices to feel the ceiling, or when you decide to start customizing with Node-RED.

The quick recap

Same ports, same install, about three times the processing power, and a 25-device VE.Direct limit. Big or heavily customized system: go MK3. Smaller, simpler setup: the MK2 still has you covered — and either way, VRM puts the whole system on your phone (our full VRM setup guide is here).

Not sure which GX fits your boat, RV, or off-grid build? Book a free consultation with one of our ABYC-certified Advisors and we'll look at your system with you — or browse the full Victron Energy collection.