Victron Quattro-II 3000VA 12V 2x120V Inverter/Charger

The Victron Quattro-II 12/3000/120-50 2x120V is built for mobile power systems that need to manage two dedicated AC power sources without constant manual switching. For RV, marine, overland, and off-grid installations, that typically means one input for shore power and one input for a generator, each configured with its own current limit.

That two-input design is the key reason to choose a Quattro. Shore power and generator power are not always available at the same capacity, and they should not always be treated the same way. A campground pedestal may allow a higher draw, while an onboard or portable generator may need a lower current threshold to prevent overload. The Quattro-II allows those sources to be connected and configured separately, then automatically uses the active source while managing charging and pass-through power appropriately.

Beyond its dual-input AC management, this unit also provides 3000VA inverter capacity, 2400W continuous output at 25°C, and up to 120A of battery charging for a 12V battery bank. In a properly designed system, it can support everyday AC loads while keeping batteries charged from shore power or generator input.

For 50A RV-style layouts, the 2x120V behavior is especially useful. In inverter mode, the Quattro-II provides 120V power to both L1 and L2 output legs so 120V loads on either side of the panel can be powered from the battery. It does not create true 240V power from the battery; 240V loads are only supplied when connected to a proper split-phase AC source.

Product Role

The Victron Quattro-II 12/3000/120-50 2x120V helps manage two AC input sources, inverter power, and battery charging in a mobile power system.

It can help support:

• Dedicated shore power and generator connections
• Separate current limits for different AC sources
• Automatic source selection when AC power is available
• Reliable 120V inverter power from a 12V battery bank
• Battery charging from shore power or generator input

Why It Matters

A Quattro is ideal when your system has more than one AC power source. Instead of wiring around a single-input inverter/charger or relying on external switching, the Quattro-II is designed to accept two independent AC inputs. In a typical RV or marine installation, one input can be configured for shore power while the other is configured for generator power.

That matters because not every AC source can safely provide the same amount of current. A 50A shore connection may allow more power than a smaller generator. With the Quattro-II, each input can be configured with the appropriate limit so the system can prioritize loads, manage battery charging, and reduce the risk of overloading the active source.

PowerControl and PowerAssist add another layer of flexibility. PowerControl helps keep the system from exceeding the configured input current limit, while PowerAssist can supplement limited shore or generator power with battery power during short periods of higher demand. When demand drops, available power can be used to recharge the batteries.

Key Features

• Two independent AC inputs: Connect two AC sources, such as shore power and generator power, without building the system around a single input.
• Dedicated input current limits: Configure different current thresholds for each AC source, helping protect lower-capacity generators while still taking advantage of higher-capacity shore power.
• Automatic source connection: The Quattro-II automatically connects to an active AC source, simplifying day-to-day operation in mobile systems.
• PowerControl and PowerAssist: Helps prevent overload of shore or generator input and can supplement limited AC input with battery power during short peak-load events.
• 3000VA inverter capacity: Provides dependable inverter power for properly sized 120V mobile loads.
• 120A battery charging: Charges a 12V battery bank from available shore power or generator input.
• 2x120V inverter output behavior: In inverter mode, provides 120V power to both L1 and L2 output legs for compatible 50A RV-style panels.

System Integration

The Quattro-II is the right fit when a system needs a clean AC architecture for shore power, generator power, inverter output, and battery charging. Its two AC inputs reduce the need for external source-switching complexity and allow each source to be configured based on its real-world capability.

In a complete Victron-based mobile power system, the Quattro-II can work alongside lithium batteries, solar charge controllers, alternator charging, GX monitoring, battery monitoring, and system controls. A Cerbo GX or other GX device can enable system visibility through VRM, giving owners and installers a clearer view of power flow, battery status, charging behavior, and system performance.

Best For

• RVs with both shore power and generator input
• 50A RV electrical systems using 120V loads across L1 and L2
• Marine systems with dock power and onboard generator power
• Off-grid cabins or mobile workspaces with generator backup
• Customers who need different current limits for different AC sources
• Systems where automatic AC source handling is preferred over manual switching

MobileMustHave Expert Note

The Quattro-II is often the better choice when your system has both shore power and generator power. MobileMustHave helps customers think through those real-world power sources, current limits, load priorities, battery charging goals, and monitoring needs so the inverter/charger fits the system instead of forcing the system to work around the inverter.