MultiPlus-II 12/3000/120-50 120 volt (UL) Trusted Brand

Victron Energy MultiPlus-II 12/3000/120-50 120V inverter/charger with 3000VA true sine wave output, 120A battery charging, 50A transfer switch, ESS functionality, PowerControl, PowerAssist, and VE.Bus system integration for marine, mobile, off-grid, backup, and energy storage systems.

The Victron MultiPlus-II PMP122305122 is a 12V, 120V inverter/charger that combines the core functions of a MultiPlus with ESS energy storage functionality. It integrates a true sine wave inverter, adaptive battery charger, and automatic transfer switch in one unit, making it suitable for professional marine, yachting, vehicle, and land-based off-grid applications.

PowerControl and PowerAssist help manage limited grid, shore, or generator power. The system can reduce battery charging to avoid overloading the AC source, then supplement that source with battery power during temporary peak demand. When the load drops, available AC power is used to recharge the battery.

The MultiPlus-II can be used in off-grid and grid-connected PV systems and is compatible with both solar charge controllers and grid-tie inverters. The page 1 system diagrams show both a standard marine, mobile, or off-grid installation and a grid-parallel topology with an MPPT solar charge controller, where an external current sensor or power meter can help optimize self-consumption and prevent grid feed when required.

Key Features

• 12V DC inverter/charger for 120V AC systems
• MultiPlus-II design with ESS energy storage functionality
• 3000VA true sine wave inverter output
• 2400W continuous output at 25°C
• 5500W peak power
• 120A maximum battery charge current
• 50A transfer switch
• 50A maximum AC input current
• PowerControl and PowerAssist
• Optional external AC current sensor support up to 100A
• Main AC output has no-break functionality
• Transfer to inverter power in less than 20 milliseconds
• Second AC output is live only when AC input is available
• Compatible with off-grid and grid-connected PV systems
• Compatible with solar charge controllers and grid-tie inverters
• Supports parallel, split-phase, and three-phase operation
• VE.Bus communication port for system integration, remote monitoring, and expanded system configurations
• Programmable relay
• Two general-purpose communication ports
• Remote on/off capability
• Fan-assisted cooling
• Compatible with Victron GX devices, VRM Portal, VRM app, VE.Bus Smart Dongle, MK3-USB interface, Digital Multi Control Panel, and VictronConnect app

Technical Specifications

• Manufacturer: Victron Energy
• Model: MultiPlus-II 120V 12/3000/120-50
• Part Number: PMP122305122
• DC System Voltage: 12V
• DC Input Voltage Range: 9.5V to 17V
• AC Output Voltage: 120VAC ± 2%
• Output Frequency: 60Hz ± 0.1%
• Continuous Output Power at 25°C: 3000VA / 2400W
• Continuous Output Power at 40°C: 2200W
• Continuous Output Power at 65°C: 1700W
• Peak Power: 5500W
• Maximum Efficiency: 93%
• Zero Load Power: 13W
• Zero Load Power in AES Mode: 9W
• Zero Load Power in Search Mode: 3W
• Transfer Switch Rating: 50A
• Maximum AC Input Current: 50A
• AC Input Voltage Range: 90V to 140VAC
• AC Input Frequency Range: 55Hz to 65Hz
• Absorption Charge Voltage: 14.4V
• Float Charge Voltage: 13.8V
• Storage Mode Voltage: 13.2V
• Maximum Battery Charge Current: 120A
• Battery Temperature Sensor: Yes
• Auxiliary Output: 32A
• External AC Current Sensor: Optional, 100A
• Programmable Relay: Yes
• VE.Bus Communication Port: Yes
• General Purpose Communication Ports: 2
• Remote On/Off: Yes
• Operating Temperature Range: -40°C to +60°C / -40°F to 140°F
• Humidity: Maximum 95%, non-condensing
• Enclosure Material and Color: Steel, blue RAL 5012
• Protection Category: IP22
• Battery Connection: M8 bolts
• AC Connection: 13 mm² / 6 AWG
• Dimensions: 578 x 277 x 148 mm / 22.8 x 10.9 x 5.8 in
• Weight: 19 kg / 42 lb
• Listing: UL458
• Safety Standards: EN-IEC 60335-1, EN-IEC 60335-2-29, CSA 22.2 107.1-16
• Emission and Immunity Standards: EN 55014-1, EN 55014-2, EN-IEC 61000-3-2, EN-IEC 61000-3-3, IEC 61000-6-1, IEC 61000-6-2, IEC 61000-6-3

Applications

• Marine electrical systems
• Yachting power systems
• Vehicle power systems
• Land-based off-grid systems
• Energy storage systems
• Grid-connected PV systems
• Backup power systems
• Generator-assisted systems
• Shore power systems
• Critical-load backup installations

Ideal For

• 12V battery systems requiring 120VAC output
• Professional marine, mobile, and off-grid installations
• Systems that need inverter, charger, and transfer switch functions in one unit
• Installations using limited shore, generator, or grid power
• Victron-based ESS and solar-supported power systems
• Users who need remote monitoring and system integration through Victron GX and VRM
• Systems requiring expandable parallel, split-phase, or three-phase capability

Protection Features

• Output short-circuit protection
• Overload protection
• Battery voltage too high protection
• Battery voltage too low protection
• Temperature too high protection
• Protection against 120VAC on inverter output
• Input voltage ripple too high protection

System Compatibility

• Compatible with 12V battery systems
• Designed for 120VAC systems
• Compatible with off-grid PV systems
• Compatible with grid-connected PV and alternative energy systems
• Compatible with solar charge controllers
• Compatible with grid-tie inverters
• Supports VE.Bus communication
• Supports parallel operation with compatible Victron Multi units
• Supports split-phase operation with two units of the same model
• Supports three-phase operation with three units of the same model
• Compatible with Cerbo GX, Ekrano GX, and other compatible GX devices for VRM remote monitoring
• Compatible with VE.Bus Smart Dongle for Bluetooth monitoring and control
• Configurable with VEConfigure software using an MK3-USB interface
• Supports optional 100A external current sensor for PowerControl, PowerAssist, and self-consumption optimization

Check Before Ordering

• Confirm your system uses a 12V DC battery bank.
• Confirm your loads and installation are designed for 120VAC output.
• Verify that 2400W continuous output and 5500W peak power are suitable for your connected loads.
• Confirm the battery bank can safely accept up to 120A charging current.
• Confirm whether your application requires ESS functionality, grid-parallel operation, or off-grid operation.
• Check whether an external current sensor or power meter is needed for self-consumption optimization or grid-feed control.
• Verify installation requirements for AC wiring, DC wiring, overcurrent protection, grounding, ventilation, and clearances.
• Confirm whether monitoring or configuration accessories such as a GX device, VE.Bus Smart Dongle, MK3-USB interface, or Digital Multi Control Panel are required.
• For parallel, split-phase, or three-phase systems, confirm that all units are the same compatible model and are configured correctly.