Victron Energy MultiPlus-II 2x 120V Inverter/Charger, 3000VA

Overview

The Victron Energy MultiPlus-II 2x 120V is an inverter/charger for 12V or 24V battery banks that need North American 120/240V split-phase shore or generator input and 120V inverter output on board. It combines battery charging, AC transfer, and inverter backup in one unit, which helps simplify power systems on cruising boats, fishing boats, and larger mobile marine installations with dual 120V distribution.

The unit accepts split-phase 180-280 VAC or single-phase 90-140 VAC input and uses a 50A transfer switch. When no AC source is available, it switches to 120VAC inverter output and internally connects L1 and L2 so both sides of a 120V panel can continue to receive power. True 240V loads remain available only when the incoming source is 120/240V split phase, which helps keep high-demand 240V equipment from draining the battery bank in inverter mode.

Across the range, inverter output is rated at 3000VA with 2400W continuous power at 25 C and 5500W peak power. The 12V models provide up to 120A charging, while the 24V models provide up to 70A charging, so the correct version should be matched to the vessel’s house battery voltage and charging plan.

Key features

• Supports North American 120/240V split-phase input with a 50A transfer switch and up to 50A maximum AC input current on each leg.
• Accepts single-phase 120V input and can supply 120VAC inverter output to both L1 and L2 output lines when shore or generator power is not available.
• Rated at 3000VA and 2400W continuous output at 25 C, with 5500W peak power for short starting loads.
• PowerControl and PowerAssist help manage limited shore or generator current on the L1 input by reducing charge current or drawing from the battery when needed.
• Two AC outputs support separation of essential loads from loads that should only run when external AC is present.
• VE.Bus communication supports remote monitoring, system integration, parallel operation, and three-phase configurations using compatible Victron equipment.
• IP22 steel enclosure measures 578 x 275 x 148 mm and weighs 22 kg, making it suited to a dry, ventilated electrical compartment rather than an exposed deck or cockpit location.

Variants

This MultiPlus-II 2x 120V range is offered in 12V and 24V configurations, with standard and UL certification options.

The main differences are the DC input voltage, maximum charger current, and certification option. The 3000VA inverter rating, 50A transfer capability, split-phase AC handling, VE.Bus integration, enclosure size, and IP22 protection category are consistent across the listed models.

• PMP122305100: 12V DC input, 120A charger current, Certification Standard. This version matches 12V house battery systems where high charging current is needed from shore power or a generator.
• PMP122305102: 12V DC input, 120A charger current, Certification UL. This version keeps the 12V charging capacity while adding the UL certification option for installations that require it.
• PMP242305130: 24V DC input, 70A charger current, Certification Standard. This version matches 24V house battery systems, which are common on boats with larger DC loads or longer cable runs.
• PMP242305132: 24V DC input, 70A charger current, Certification UL. This version keeps the 24V system configuration while adding the UL certification option for projects that call for that standard.

Installation and fit

This inverter/charger should be installed by a qualified marine electrical professional. It belongs in a dry and well-ventilated area, mounted close to the batteries to reduce voltage drop, with at least 10 cm of clear space around the unit for cooling. It should not be mounted directly above batteries, and the interior of the unit should remain accessible after installation.

The enclosure is IP22, so placement matters. It should be kept away from spray, bilge moisture, oil, soot, and vapors. For many boats, that points to a protected electrical locker, equipment space, or machinery area with airflow rather than an exposed location.

Electrical and system integration

The AC side uses screw terminals sized for 21 mm² or 4 AWG conductors, and the system requires appropriate AC and DC overcurrent protection and disconnects. Battery cable sizing, fuse selection, and grounding should be matched to the selected 12V or 24V model, the battery bank, and the vessel’s wiring standards.

For monitoring and setup, the unit works within the Victron VE.Bus ecosystem. It can be configured with VEConfigure using an MK3-USB interface, and it can be monitored or controlled through compatible GX devices, VRM, a Digital Multi Control panel, or a VE.Bus Smart Dongle depending on the rest of the system.

Use cases on board

This range suits boats that need inverter backup for 120V loads while still making practical use of shore power or a generator when available. It is especially relevant for vessels with split-phase dockside service, larger house battery banks, and mixed AC loads where some equipment should continue from the inverter and other loads should only run when external AC is present.