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The Quattro-II 12V 3kVA 2x120V is a transformer-based inverter-charger for 12V systems that also passes 120/240V split-phase power through when it is present at the input. It suits boats, RVs, and cabins that want 240V loads such as water pumps to run only on shore or generator power.
Planning a system? Read our guide: How to size a battery backup system for your home.
Well suited to 12V boats and RVs with 50A split-phase shore power, and to cabins where 240V loads only need to run with the generator on.
About the Quattro-II 12/3000/120-50/50 2x120V Inverter-Charger The Victron Quattro-II 3kVA 2×120 is a transformer-based inverter-charger and transfer switch with grid interactive capability. It is ideal for heavy power needs like portable power stations, boats and yachts, grid-tied homes, off-grid cabins, and recreational vehicles. Whether the installation is in a house, boat, or RV, Victron’s dedication to quality is evident in the materials used and in the ever-growing list of features and firmware updates. Dual AC Inputs and Outputs with Integrated Transfer Switch The transfer switch features two isolated AC inputs and two AC outputs. The unit automatically switches between grid or shore power, generator, and inverter, based on which source is available. Both AC inputs are monitored for power loss, and the transfer switch reacts quickly so devices like computers and network equipment remain powered at all times. L1 on the main output has a transfer time of AC-Out one is for critical loads that should remain running at all times. By default, AC-Out two turns on when AC input is available, but can be reprogrammed to turn on and off loads at opportune times. This inverter charges batteries up to 120Adc from AC inputs such as shore power or generators, and it can utilize the battery’s stored energy to power loads up to 3,000VA (2,400W) continuously. PowerAssist and PowerControl The inverter provides a pure sine wave output and 5.5kW peak capacity because of the low-frequency topology. For larger loads, the PowerAssist and PowerControl functions adjust charge current, and additional incoming AC power with inverted power. They mitigate the chances of overloading an incoming AC connection. When incoming power is more than the loads consume, PowerAssist automatically diverts extra AC power to battery charging. The Ability to Power 120/240V from One Inverter The 2x120V feature means the inverter receives 120/240V input and delivers 120/240V output when the split-phase input is present. While the inverter only uses 120V power to charge the batteries, loads can be connected to both L1 and L2 and receive 120V power at any time, even if the 120/240V power input is disconnected. Loads that require 240V power must be connected to both L1 and L2 outputs, but they will not receive power when the inverter is disconnected from split-phase power that is supplied by AC input. Just like all Victron 120V inverters, this inverter can only output 120V power from the batteries. When there is no 120/240V power input available, 120V loads on both L1 and L2 receive 120V power, though 240V loads receive 0V. When 120/240V power input is restored, the 240V loads receive 240V power. This allows large loads like water pumps to operate only when AC input is available, preserving battery power for the critical loads in the system. Dynamic Neutral-Ground Bond and Other Programmable Relays In any system with multiple AC inputs, it’s crucial to prevent multiple connections between neutral and ground. To address this, the Quattro features a dynamic neutral-ground bonding relay that automatically connects the AC neutral output terminal to ground while operating in inverter mode and releasing this bond when powering loads from an external source. This design ensures that two neutral-to-ground connections do not occur simultaneously, preventing electrical shock hazards and tripping GFCIs. Multiple programmable control outputs can be utilized to trigger external equipment and accessories such as auto-starting a generator (2-wire signal), turning on fans, diversion loads, or lights. One programmable relay (NO/NC), one 12V 100mA outputs, and an external ground relay connection are available. An input is also available to remotely turn on or shut down the inverter. Power Connections Two pairs of M8 battery connection terminals are provided to connect DC power from a battery bank. Use two sets of pre-crimped 1/0 AWG inverter power cables with 5/16″ ring terminals for thi
Warranty terms mentioned in this description are the manufacturer’s. Our own coverage is the 30-day limited warranty.
We confirm compatibility, installation requirements, and delivery details with you during order review, before any payment. Home electrical work may require a qualified installer.
Our team can help confirm how the 12V Quattro-II passthrough would work with your shore power or generator. Message our team on WhatsApp.
Victron Energy
Smaller 48V systems that still want two AC inputs can use the Victron Quattro 48/3000, a 3000W, 120V inverter-charger with a 35A charger and transfer switch. It connects automatically to the active AC source.
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Victron Energy
This is the 24V version of the Quattro-II 3kVA 2x120V, paired with a 70A charger. It works as an inverter-charger and transfer switch and passes 120/240V split-phase power through when that input is present, while supplying 120V from the battery.
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Victron Energy
For systems that need more headroom than a 3kVA unit, the MultiPlus-II 48V 5kVA pairs an iron-core transformer with a 70A battery charger. It gives 4,000W continuous at 120V with 9,000W of surge, enough to start welders, compressors, and well pumps smoothly. It is aimed at off-grid homes, subpanels, and battery backup systems that may grow over time.
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Victron Energy
Victron built the MultiPlus-II 48/5000/70-95 120V to combine MultiPlus inverter-charger functions with MultiGrid features such as anti-islanding protection. It is a core component of Victron's Dynamic ESS platform for homes that want to manage grid, battery, and solar power together.
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