Victron Energy MultiPlus-II 48/3000/35-50 120V Inverter/Charger – PMP482305102

Product Overview

The Victron Energy MultiPlus-II 48/3000/35-50 120V VE.Bus (UL) is an advanced inverter/charger designed to deliver reliable AC power from a 48V battery bank. Combining a pure sine wave inverter, an intelligent battery charger and an automatic AC transfer switch, this versatile unit provides an integrated power solution for marine installations, recreational vehicles, off-grid systems and backup-power applications.

With a 3,000VA inverter capacity, 35A battery charging capability and a 50A transfer switch, the MultiPlus-II helps manage power from batteries and external AC sources within a single compact unit. Its integrated PowerControl and PowerAssist functions provide additional flexibility when working with a limited shore-power connection or generator supply.

Pure Sine Wave Inverter Performance

The built-in inverter converts 48V DC battery power into 120V AC electricity with a pure sine wave output. This is suitable for many compatible appliances, electronics and electrical equipment, subject to the unit's power rating and the characteristics of the connected loads.

The inverter is rated at 3,000VA, with continuous active power output of approximately 2,400W at 25°C. Output capability reduces at higher temperatures, with approximately 2,200W available at 40°C and 1,700W at 65°C. Peak power is rated at 5,500W for short-duration demands.

The wide DC input operating range of 38–66V supports correctly designed 48V battery systems. To achieve dependable performance, the battery bank must have sufficient capacity and discharge capability, and the installation must use appropriately sized DC cabling and overcurrent protection.

Integrated 35A Battery Charger

The MultiPlus-II includes a built-in battery charger with a maximum charging current of 35A. When a suitable external AC supply is available, the unit can supply connected loads while charging the battery bank.

Victron's adaptive charging technology manages the charging process according to the configured charging profile and battery requirements. Correct configuration helps support battery performance and service life. Charging parameters must always be selected to match the battery chemistry and the battery manufacturer's recommendations.

Automatic AC Transfer Switch

The integrated 50A transfer switch enables the MultiPlus-II to change between an external AC source and inverter-generated power. When an acceptable external supply is present, the unit can pass power through to supported loads and charge the batteries. If the incoming supply becomes unavailable, the inverter can take over to help maintain the AC power supply.

This automatic changeover is particularly useful in marine and mobile installations where power may be supplied alternately by shore power, a generator or the battery system. The incoming supply, distribution equipment and connected loads must remain within the unit's electrical ratings.

PowerControl and PowerAssist

PowerControl allows the maximum current drawn from an external AC source to be configured, helping prevent a limited supply from being overloaded. This is useful when connected to a small generator or a shore-power connection with restricted capacity.

PowerAssist takes this a step further by allowing battery-powered inverter assistance when demand temporarily exceeds the available incoming AC supply. This can help support short periods of higher demand without requiring the external source alone to provide the full load.

Together, these functions provide flexible power management for installations where supply capacity and electrical demand vary.

VE.Bus Communication and System Integration

The VE.Bus communication interface enables configuration and integration with compatible Victron equipment. Depending on the system design and the equipment used, the MultiPlus-II can form part of a larger power system with compatible monitoring, remote control and energy-management functions.

Remote on/off control is supported, while additional equipment can provide system monitoring and access to configuration settings. Parallel and split-phase arrangements are possible with compatible units and appropriate system configuration.

Applications

The Victron Energy MultiPlus-II 48/3000/35-50 120V is suitable for compatible marine electrical systems, recreational vehicles, mobile power installations, remote cabins and off-grid systems designed around 48V batteries and 120V AC equipment.

It is also an option for selected backup-power applications where the inverter capacity, charging capability and transfer-switch rating meet the installation's requirements. Its combined inverter and charger functions can help reduce the number of separate components required in a power system.

This model produces 120V AC and is intended for compatible electrical systems. It should not be confused with the 230V version typically used in UK and European installations.

Technical Specifications

Product name: Victron Energy MultiPlus-II 48/3000/35-50 120V (UL).

Product code: PMP482305102.

Product type: Inverter/charger with automatic AC transfer switch.

Nominal battery voltage: 48V DC.

DC input voltage range: 38–66V.

Inverter capacity: 3,000VA.

Continuous active power at 25°C: 2,400W.

Continuous active power at 40°C: 2,200W.

Continuous active power at 65°C: 1,700W.

Peak power: 5,500W.

AC output voltage: 120V AC.

Output frequency: 60Hz, configurable within the specified operating range.

Maximum battery charging current: 35A.

Transfer switch rating: 50A.

Maximum AC input current: 50A.

Maximum inverter efficiency: approximately 95%.

Protection rating: IP21.

Communication interface: VE.Bus.

Dimensions: approximately 572 × 277 × 147mm (height × width × depth).

Weight: approximately 19kg.

Key functions: Pure sine wave inversion, adaptive battery charging, PowerControl, PowerAssist and automatic AC transfer.

Installation and Compatibility

The MultiPlus-II must be installed in accordance with Victron's instructions and the electrical regulations applicable to the installation. Check that the battery bank is suitable for a 48V system and can deliver the current required by the inverter under expected load conditions.

The installation should include correctly rated DC cabling, suitable battery-side overcurrent protection, appropriate AC circuit protection, proper earthing and sufficient ventilation. Charging parameters must be configured for the installed battery type.

Any parallel or split-phase installation requires compatible equipment, correct configuration and suitable commissioning. The UL version should be selected where its certification and electrical characteristics are appropriate for the intended installation.

Before purchasing, verify that the 120V AC output is compatible with the intended appliances and distribution system. Installation and commissioning by a suitably qualified professional are recommended.

Product Summary

The Victron Energy MultiPlus-II 48/3000/35-50 120V VE.Bus combines a 3,000VA pure sine wave inverter, 35A battery charger and 50A transfer switch in one integrated unit. With PowerControl, PowerAssist and VE.Bus system integration, it provides a flexible power-management solution for compatible 48V battery installations requiring 120V AC electricity.