Victron Energy MultiPlus-II 12V 3000VA 120V Pure Sine Wave Inverter Charger, 50A Transfer Switch, UPS, PowerAssist, ESS Compatible

The Victron Energy MultiPlus-II 12V 3000VA 120V Inverter Charger (Model 12/3000 120V, MPN PMP122305120) combines a pure sine wave inverter, an integrated battery charger, and a 50A transfer switch in one compact unit. Built for marine, RV, off-grid solar, home backup, and energy storage systems, the MultiPlus-II pairs the proven MultiPlus design with advanced MultiGrid technology to deliver reliable 120VAC power, intelligent battery charging, and seamless power management.

12V 3000VA Inverter Charger with MultiGrid Technology

The MultiPlus-II delivers 3000VA of clean pure sine wave power at 120VAC, with built-in anti-islanding protection and an integrated adaptive battery charger. It automatically manages power from shore, generator, or grid sources and provides uninterrupted energy when external AC power is unavailable.

PowerAssist and PowerControl for Generators and Shore Power

PowerControl prevents generators and shore power connections from becoming overloaded. When demand exceeds the available AC input, PowerAssist supplements it with energy from the battery bank, and once demand drops, surplus AC power is used to recharge the batteries.

Built-In UPS Backup Power

When grid, generator, or shore power is disconnected, the MultiPlus-II switches to inverter mode in less than 20 milliseconds. Computers, electronics, and other sensitive equipment continue operating without interruption.

Energy Storage System (ESS) Compatible

The MultiPlus-II is a key component of Victron ESS installations, integrating with MPPT solar charge controllers and grid-tied solar inverters for flexible energy management in residential, mobile, and off-grid power systems.

Remote Monitoring and System Control

Paired with a Victron GX device such as the Cerbo GX, the MultiPlus-II can be monitored and controlled locally or remotely through the Victron VRM platform. Adjust settings, track battery performance, control connected equipment, and manage backup power from a phone, tablet, laptop, or computer.

Key Features

• 12V 3000VA pure sine wave inverter charger
• 120VAC output
• 50A transfer switch
• Integrated adaptive battery charger
• PowerControl prevents generator and shore power overloads
• PowerAssist boosts available AC power with battery energy
• UPS function with transfer under 20 ms
• Built-in anti-islanding protection
• Victron ESS energy storage system compatible
• Works with MPPT solar chargers and grid-tie inverters
• Remote monitoring and control with Victron GX devices and VRM

Applications

• RV, camper, and motorhome power systems
• Boats and marine electrical systems
• Off-grid solar installations
• Home backup power systems
• Energy storage systems (ESS)
• Mobile and emergency power
• Generator-assisted power systems

Specifications

The Victron Energy MultiPlus-II 12V 3000VA 120V Inverter Charger delivers dependable UPS backup power, intelligent battery charging, and ESS-ready energy management in a single high-performance unit for RV, marine, off-grid, and home backup systems.