Victron Energy MultiPlus Inverter/Charger, 3000VA, 120V AC, VE.Bus, 50A Transfer Switch

Overview

The Victron Energy MultiPlus is a 120 VAC inverter/charger for boat AC power systems that combines a 3000 VA true sine wave inverter, adaptive battery charging, and a 50 A transfer switch in one unit. It is built for installations where shore power, generator power, and battery power all need to work together without adding separate inverter and charger hardware.

This MultiPlus range covers both 12 V and 24 V house-bank systems. The 12 V versions use a 120 A charger, while the 24 V versions use a 70 A charger. In inverter mode, the unit supplies 120 VAC at 60 Hz, with 2400 W continuous output at 25°C and 6000 W peak power.

On board, it is useful for running AC loads from the battery bank, recharging batteries from shore power or a generator, and keeping selected AC circuits powered when the external AC source drops away. The 50 A transfer switch helps simplify dockside and generator integration, while PowerControl and PowerAssist help manage limited shore or generator capacity.

Key features

• Combines a 3000 VA true sine wave inverter, battery charger, and 50 A AC transfer switch in one enclosure.
• Supports 120 VAC output at 60 Hz for common North American marine AC loads.
• Available for 12 V battery systems with 120 A charging or 24 V battery systems with 70 A charging.
• PowerControl helps prevent overload when shore power or generator capacity is limited.
• PowerAssist can supplement shore or generator input with battery power during short periods of higher demand.
• Transfer switching takes place in less than 20 milliseconds, helping many connected AC loads continue running during source changes.
• VE.Bus communication supports system configuration, parallel operation, three-phase operation, remote monitoring, and integration with compatible Victron equipment.
• Second AC output is available for loads that should only run when shore power or generator power is present.
• Aluminum enclosure with IP21 protection for dry, ventilated electrical spaces.

Variants

This MultiPlus inverter/charger is offered in four configurations for different battery-system voltages, charging amperage requirements, and UL approval needs.

The main differences are DC system voltage, charger output, and UL approval status. Across these configurations, the product family keeps the 3000 VA inverter rating, 120 VAC output, 50 A transfer switch, true sine wave output, PowerControl, PowerAssist, and VE.Bus communication.

• PMP123021102: 120 A charger, 12 V DC battery system, UL Approved No. This configuration fits 12 V house-bank installations where higher charge current is needed from shore power or a generator.
• PMP243021102: 70 A charger, 24 V DC battery system, UL Approved No. This configuration fits 24 V house-bank installations where lower DC current is preferred for the same inverter class.
• PMP122301102: 120 A charger, 12 V DC battery system, UL Approved Yes. The UL approval is relevant for installations where listed equipment is required by the project, survey, or electrical plan.
• PMP242301102: 70 A charger, 24 V DC battery system, UL Approved Yes. This version pairs the 24 V battery-system format with UL-approved compliance for installations that require it.

Installation and setup

Plan the installation in a dry, ventilated electrical space with enough access for cable routing, service checks, and airflow. The unit should not be mounted in a wet or dusty location, which matters on boats where lockers, engine rooms, and lazarettes can see moisture, heat, and salt air.

Battery-bank sizing, DC fuse selection, and cable length all affect whether the unit can deliver its rated output. For full-capacity installations, the 12 V versions call for a 400 to 1200 Ah battery bank and a 400 A DC fuse, while the 24 V versions call for a 200 to 700 Ah battery bank and a 300 A DC fuse. Final wiring and protection should be matched to the vessel layout and applicable marine electrical standards.

Electrical and system integration

The AC input range is 95 to 140 VAC at 45 to 65 Hz, which suits 120 V shore power or generator input when the vessel is wired and configured correctly. The inverter output is 120 VAC with a frequency of 60 Hz, so it can support typical onboard AC circuits within the rated capacity of the selected installation.

The VE.Bus port is useful when the MultiPlus is part of a larger Victron power system. With compatible Victron interfaces and monitoring equipment, it can be configured, monitored, and integrated with battery monitors, GX devices, and other system controls.

Use cases on board

This MultiPlus range is a good match for cruising boats, sportfishing boats, and workboats that move between dock power, generator use, and battery-powered AC loads. It is especially practical where the owner wants one inverter/charger platform to handle battery charging, AC source transfer, and shore or generator current management.

The 12 V versions make sense on vessels already built around a 12 V house bank, while the 24 V versions suit boats with higher-voltage DC systems and longer cable runs where reducing DC current can help with installation planning.