Overview

The Victron Energy PMP482505120 is a MultiPlus-II 48/5000/70-95 120V inverter/charger for 48V DC battery systems and 120V AC onboard power. It combines a 5000 VA pure sine wave inverter, a 70A adaptive battery charger, and a 95A transfer switch in one unit, giving a boat one central device for inverting, charging, shore power management, and generator support.

For larger cruising boats, yachts, and professionally installed off-grid marine systems, this unit is most relevant where a 48V battery bank is already part of the electrical plan. It can supply 120 VAC loads from the battery bank, charge batteries from shore or generator power, and switch to inverter operation in less than 20 milliseconds when AC input is lost.

The MultiPlus-II also supports PowerControl and PowerAssist, which are useful when dock power or generator capacity is limited. Battery charging can be reduced to avoid overloading the AC source, and battery power can help cover short periods of higher AC demand.

Key features

• 48V DC input with a 38 to 66V operating range for properly configured 48V battery banks.
• 120 VAC output at 60 Hz for North American onboard AC systems.
• 5000 VA inverter rating, 4000 W continuous output at 25 degrees C, and 9000 W peak power.
• 70A battery charger with adaptive charging for managing a 48V house battery bank.
• 95A transfer switch for switching between shore or generator input and inverter output.
• Two AC outputs, with the second output active only when external AC power is available.
• PowerControl and PowerAssist help manage limited shore power or generator capacity on board.
• VE.Bus communication supports monitoring, configuration, parallel operation, and system integration.
• UL1741 listing with built-in anti-islanding functionality for compliant ESS-style installations where applicable.
• Steel enclosure with IP22 protection, M8 battery connections, and 2 AWG 120 VAC connection sizing for the 48/5000 model.

Installation and setup

This inverter/charger belongs in a dry, ventilated electrical space where it is protected from direct spray and standing moisture. The IP22 enclosure is not intended for exposed deck, cockpit, bilge, or washdown locations, so placement inside a technical locker, utility space, or electrical compartment is the more appropriate marine installation approach.

At 71 lb and 26.6 x 13.0 x 6.5 in, it needs a mounting surface with enough strength for vessel motion and vibration. Cable sizing, overcurrent protection, battery isolation, grounding, and AC source switching should be planned as part of the full onboard electrical system, especially because this model works with high DC current and high AC input capacity.

Electrical and system integration

The unit is suited to 48V battery systems feeding 120V AC loads, with a 90 to 140 VAC input range and 55 to 65 Hz input frequency for shore power or generator charging. The main AC output remains available through either inverter power or external AC input, while the second AC output is useful for loads that should run only when shore or generator power is present.

VE.Bus connectivity allows the MultiPlus-II to be part of a larger Victron electrical system. With compatible GX monitoring hardware, the system can be monitored locally or remotely, and settings can be adjusted through the Victron ecosystem. Multiple units can also be configured for expanded installations, including parallel and three-phase arrangements when the vessel or project requires a larger AC system.

Use cases on board

This inverter/charger is a strong match for boats moving to a 48V house bank, larger inverter loads, and more structured energy management between batteries, shore power, generator input, and solar charging equipment. It fits cruising yachts, workboats, and liveaboard installations where AC power continuity and charger capacity matter more than compact plug-and-play simplicity.

In everyday use, it can keep sensitive AC electronics running through a shore power interruption, reduce the chance of overloading a limited dock pedestal, and support short high-demand periods without immediately requiring a larger generator connection.