MultiPlus-II 48/4k5/55-32 GX

The MultiPlus-II 48/4k5/55-32 GX is an all-in-one device from Victron Energy, designed for standalone and hybrid power systems. It combines a 4500 VA pure sine wave inverter, a 55 A adaptive battery charger, and an ultra-fast AC transfer switch. It also integrates a GX device for local or remote monitoring and control.

The built-in inverter in the MultiPlus-II 48/4k5/55-32 GX has a nominal power rating of 4500 VA, which is equivalent to 4.5 kVA. It delivers a pure sine wave output.

The MultiPlus-II 48/4k5/55-32 GX is equipped with an adaptive battery charger with a capacity of 55 amperes (55A).

Yes, the MultiPlus-II 48/4k5/55-32 GX provides uninterrupted AC power via its UPS (Uninterruptible Power Supply) function. In the event of a mains failure, it automatically switches to inverter mode in less than 20 milliseconds.

The PowerControl and PowerAssist functions prevent overloading limited AC sources such as generators or shore power connections. The PowerControl function allows you to set an AC current limit. If consumption exceeds this limit, PowerAssist reduces the load on the battery or supplements power from the battery to cover consumption peaks.

No, the MultiPlus-II 48/4k5/55-32 GX includes an integrated GX device with a 2x16 character display. This allows local or remote monitoring and control via the VictronConnect app and the Victron Remote Management (VRM) portal without requiring external GX hardware.

Yes, the MultiPlus-II 48/4k5/55-32 GX is a central component for energy storage systems (ESS), supporting advanced features such as Dynamic ESS for real-time energy optimization based on parameters.

The MultiPlus-II 48/4k5/55-32 GX has two AC outputs:

A main output with "no-break" function, which remains powered even during a mains power failure. A secondary output, which is active only when an AC source (mains or generator) is present.

The MultiPlus-II 48/4k5/55-32 GX operates on an AC voltage of 230V, making it suitable for European installations.

The external current transformer clips around the AC conductor. On newer MultiPlus-II models, the current transformer wires (red and white) connect directly to the external current sensor terminals on the device. The red wire must be connected to the EXT terminal and the white wire to the COM terminal.

During installation, it is critical to respect the correct direction of the current transformer. The arrow marked on the transformer must always point toward the MultiPlus-II.

No, it is essential not to lengthen or shorten the cable of the external current transformer. The cable is calibrated specifically for use with the provided current transformer.

100 A or 400 A current transformers are compatible. There are two versions of the 100 A current transformer: one with bare wires (for newer MultiPlus-II units) and one with a jack plug (for older models). The 400 A current transformer is only available with bare wires and is used in external transfer switch applications.

To connect a third-party lithium battery system, the battery's Battery Management System (BMS) must provide two separate dry contacts, which can be wired to the MultiPlus-II. These signals indicate the cell overvoltage/full battery and cell undervoltage/empty battery states. The MultiPlus-II must also be updated with the latest firmware version and configured using the "Two-Signal BMS Support" assistant via VEConfigure3.

Upon receiving a cell overvoltage or fully charged signal from the BMS, the MultiPlus-II can be configured to perform two actions:

Switch to "float" mode (floating charge), where the battery is no longer charged.Disable the charger completely entirely.The choice depends on the BMS type and battery specifications.

Yes, the MultiPlus-II 48/4k5/55-32 GX can be configured for parallel operation. Up to six units can be connected in parallel to increase output power.

Yes, it is possible to configure a three-phase system. You can use up to six sets of three MultiPlus-II 48/4k5/55-32 GX units to create a three-phase system.

The external current transformer is designed to measure AC current only. It does not measure voltage. It is less accurate than a dedicated energy meter, especially at low current levels.