MultiPlus-II 48 / 4k5 55-32 GX 230V

Victron MultiPlus-II GX 48/4k5 55-32 is a professional inverter-charger with a built-in GX module and display,
which combines in one device: a sine wave inverter, a battery charger and an automatic transfer switch (UPS).
It is a solution designed for the construction of modern energy storage systems (ESS), off-grid and hybrid installations,
where power supply stability, remote monitoring and flexible system expansion are important.

Key benefits

• Inverter + charger + UPS in one:
  ensures continuous power supply and automatically switches to batteries in the event of a mains failure.


• PowerAssist and PowerControl:
  intelligently limits consumption from the grid or generator and supports battery power when the load temporarily increases.


• Built-in GX module and display:
  makes it easy to configure and integrate with the Victron system, without the need to add a separate GX device.


• Remote monitoring and configuration:
  full control of the device operation locally and via the Internet (Victron VRM portal).


• Scalability:
  the possibility of parallel and three-phase operation allows the construction of larger systems with higher power.


• Integration with photovoltaics and energy storage:
  works with on-grid and off-grid PV installations and ESS systems.

Main features

• Integration with energy storage (ESS)


• PowerAssist and PowerControl functions


• Power supply during mains failure (automatic UPS mode)


• Two independent AC outputs (selective power supply to receivers)


• Parallel and three-phase operation


• Remote Monitoring and Configuration (VRM)


• Compatibility with Victron PV systems and communications

How does it work in practice?

PowerAssist and PowerControl

PowerAssist and PowerControl automatically manage system power. If the AC source is limited
(e.g., a weak connection or generator), the device can limit battery charging to avoid overloading the input.
When power demand increases, the MultiPlus-II GX can temporarily add battery power, stabilizing the power supply.

Power supply during a mains failure

In the event of a power outage, the MultiPlus-II GX switches to battery operation and maintains power to the
selected circuits. This allows devices to continue operating without any noticeable interruption for the user.

Two independent AC outputs

The device has two AC outputs: one operates continuously, and the other is active only when mains or generator power is available. This allows for selective powering of loads that should not drain the batteries.

Specification

Parameters / Model

• Model: MultiPlus-II 48/4k5 55-32 GX 230V


• PowerControl / PowerAssist: Yes


• Transfer switch: 32 A


• Maximum AC input current: 32 A

Inverter

• Input voltage range (DC): 38-60V


• AC Output: 230 VAC ± 2%, 50 Hz ± 0.1%


• Output power at 25°C: 4 kW


• Output power at 40°C: 3.7 kW


• Output power at 65°C: 3 kW


• Time-limited power 1 (cold start): 4.5 kW for 2 hours


• Time-limited power 2 (cold start): 6 kW for 25 minutes


• Peak power: 7 kW for 1 minute


• Maximum efficiency: 95%


• No-load power consumption: 20 W


• No-load power consumption (AES): 13 W


• No-load power consumption (search mode): 8 W

Charger

• AC Input: 187-265 VAC, 45-65 Hz


• Charging voltage (absorption): 57.6V


• Charging voltage (float): 55.2V


• Storage mode: 52.8V


• Max. battery charging current (25°C): 55 A


• Max. battery charging current (40°C): 50 A


• Compatible battery types: lithium, lead-acid, zinc-bromine and others


• Battery temperature sensor: Yes

General

• Auxiliary output: Yes (32A)


• External AC current sensor (optional): 50A or 100A


• Programmable relay: Yes


• Security: ag


• VE.Bus: parallel and three-phase operation, remote monitoring, system integration


• General purpose ports: Yes, 2x


• Remote on/off: Yes


• Operating temperature: -40 to +65°C (fan-assisted cooling)


• Humidity (non-condensing): max 95%

Execution

• Material and color: steel, blue RAL 5012


• Degree of protection: IP21


• Battery connection: M8 screws


• 230V AC connection: screw terminals 13 mm² (6 AWG)


• Libra: 21.4 kg


• Dimensions: 590 x 275 x 149 mm

Certification

• Security: EN-IEC 60335-1, EN-IEC 60335-2-29, EN-IEC 62109-1, EN-IEC 62109-2


• Emission and immunity: EN 55014-1, EN 55014-2, EN-IEC 61000-3-2, EN-IEC 61000-3-3, IEC 61000-6-1, IEC 61000-6-2, IEC 61000-6-3


• Uninterruptible Power Supply (UPS): certification in progress


• Protection against islanding: certification in progress